Proposed Rule2024-11719

Section 45Y Clean Electricity Production Credit and Section 48E Clean Electricity Investment Credit

Primary source

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Published
June 3, 2024

Issuing agencies

Treasury DepartmentInternal Revenue Service

Abstract

This document contains proposed regulations relating to the clean electricity production credit and the clean electricity investment credit established by the Inflation Reduction Act of 2022. The proposed regulations would provide rules for: determining greenhouse gas emissions rates resulting from the production of electricity; petitioning for provisional emissions rates; and determining eligibility for these credits in various circumstances. The proposed regulations would affect all taxpayers who produce clean electricity and claim the clean electricity production credit with respect to a facility or the clean electricity investment credit with respect to a facility or energy storage technology, as applicable, that is placed in service after 2024. This document also provides notice of a public hearing on the proposed regulations.

Full Text

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<title>Federal Register, Volume 89 Issue 107 (Monday, June 3, 2024)</title>
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[Federal Register Volume 89, Number 107 (Monday, June 3, 2024)]
[Proposed Rules]
[Pages 47792-47846]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2024-11719]



[[Page 47791]]

Vol. 89

Monday,

No. 107

June 3, 2024

Part III





 Department of the Treasury





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Internal Revenue Service





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26 CFR Part 1





Section 45Y Clean Electricity Production Credit and Section 48E Clean 
Electricity Investment Credit; Proposed Rule

Federal Register / Vol. 89, No. 107 / Monday, June 3, 2024 / Proposed 
Rules

[[Page 47792]]


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DEPARTMENT OF THE TREASURY

Internal Revenue Service

26 CFR Part 1

[REG-119283-23]
RIN 1545-BR17


Section 45Y Clean Electricity Production Credit and Section 48E 
Clean Electricity Investment Credit

AGENCY: Internal Revenue Service (IRS), Treasury.

ACTION: Notice of proposed rulemaking and notice of public hearing.

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SUMMARY: This document contains proposed regulations relating to the 
clean electricity production credit and the clean electricity 
investment credit established by the Inflation Reduction Act of 2022. 
The proposed regulations would provide rules for: determining 
greenhouse gas emissions rates resulting from the production of 
electricity; petitioning for provisional emissions rates; and 
determining eligibility for these credits in various circumstances. The 
proposed regulations would affect all taxpayers who produce clean 
electricity and claim the clean electricity production credit with 
respect to a facility or the clean electricity investment credit with 
respect to a facility or energy storage technology, as applicable, that 
is placed in service after 2024. This document also provides notice of 
a public hearing on the proposed regulations.

DATES: Written or electronic comments must be received by August 2, 
2024. The public hearing on these proposed regulations is scheduled to 
be held on August 12, 2024, at 10 a.m. (ET) and August 13, 2024, at 10 
a.m. (ET). On August 13, 2024, the public hearing will be held by 
telephone only. Requests to speak and outlines of topics to be 
discussed at the public hearing must be received by August 2, 2024. If 
no outlines are received by August 2, 2024, the public hearing will be 
cancelled.

ADDRESSES: Commenters are strongly encouraged to submit public comments 
electronically via the Federal eRulemaking Portal at <a href="https://www.regulations.gov">https://www.regulations.gov</a> (indicate IRS and REG-119283-23) by following the 
online instructions for submitting comments. Once submitted to the 
Federal eRulemaking Portal, comments cannot be edited or withdrawn. The 
Department of the Treasury (Treasury Department) and the IRS will 
publish for public availability any comments submitted to the IRS's 
public docket. Send paper submissions to: CC:PA:01:PR (REG-119283-23), 
Room 5203, Internal Revenue Service, P.O. Box 7604, Ben Franklin 
Station, Washington, DC 20044.

FOR FURTHER INFORMATION CONTACT: Concerning these proposed regulations, 
the Office of Chief Counsel (Passthroughs and Special Industries) at 
(202) 317-6853 (not a toll-free number); concerning submissions of 
comments or the public hearing, Vivian Hayes at (202) 317-6901 (not a 
toll-free number) or by email to <a href="/cdn-cgi/l/email-protection#f9898c9b95909a919c988b90979e8ab9908b8ad79e968f"><span class="__cf_email__" data-cfemail="512124333d383239343023383f3622113823227f363e27">[email&#160;protected]</span></a> (preferred).

SUPPLEMENTARY INFORMATION:

Background

    This notice of proposed rulemaking contains proposed amendments to 
the Income Tax Regulations (26 CFR part 1) to implement sections 45Y 
and 48E of the Internal Revenue Code (Code), which generally replace 
sections 45 and 48 of the Code with respect to qualified facilities, 
and for section 48E, with respect to energy storage technology, that is 
placed in service after December 31, 2024.
    The renewable electricity production credit determined under 
section 45 of the Code (section 45 credit) is generally available for 
qualified facilities described in section 45(d), which provides that 
the construction of the qualified facilities must begin before January 
1, 2025. Similarly, other than for geothermal heat pump equipment 
(described in section 48(a)(3)(vii) \1\), the energy credit determined 
under section 48 of the Code (section 48 credit), which is an 
investment credit under section 46 of the Code, is generally available 
for energy property the construction of which begins before January 1, 
2025. Therefore, as long as construction begins on the relevant 
qualified facility or energy property before January 1, 2025, a 
taxpayer may be able to claim a section 45 credit or section 48 credit, 
respectively, even if the taxpayer places the qualified facility or 
energy property in service after December 31, 2024.
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    \1\ Section 48(a)(3)(vii) includes as energy property equipment 
that uses the ground or ground water as a thermal energy source to 
heat a structure or as a thermal energy sink to cool a structure 
(geothermal heat pump property), but only with respect to property 
the construction of which begins before January 1, 2035.
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    Sections 45Y and 48E were added to the Code, respectively, by 
sections 13701(a) and 13702(a) of Public Law 117-169, 136 Stat. 1818, 
1982 (August 16, 2022), commonly referred to as the Inflation Reduction 
Act of 2022 (IRA). Section 13701(c) of the IRA provides that the clean 
electricity production credit determined under section 45Y (section 45Y 
credit) applies to facilities placed in service after December 31, 
2024. Similarly, section 13702(c) of the IRA provides that the clean 
electricity investment credit determined under section 48E (section 48E 
credit) applies to property placed in service after December 31, 2024.
    Thus, in some cases, if a taxpayer places in service a qualified 
facility or energy property after 2024, the construction of which 
begins before 2025, the qualified facility or energy property may be 
eligible for more than one of the credits determined under section 45, 
45Y, 48, or 48E, although a taxpayer can only claim one of these 
credits with respect to such qualified facility or energy property. 
Accordingly, a taxpayer must choose which one of these credits to claim 
with respect to such qualified facility or energy property. Once the 
taxpayer has claimed one of these credits with respect to a qualified 
facility or an energy property, the taxpayer cannot claim any other of 
these credits with respect to the same qualified facility or energy 
property.

I. Overview of Section 45Y

    Section 45Y(a)(1) provides that for purposes of the general 
business credit under section 38 of the Code, the section 45Y credit 
for any taxable year is an amount equal to the product of the kilowatt 
hours (kWh) of eligible electricity produced by the taxpayer at a 
qualified facility, multiplied by the applicable amount with respect to 
such qualified facility. For this purpose, eligible electricity is 
electricity that is either (1) sold by the taxpayer to an unrelated 
person during the taxable year or (2) in the case of a qualified 
facility that is equipped with a metering device that is owned and 
operated by an unrelated person, sold, consumed, or stored by the 
taxpayer during the taxable year.

A. Amount of Credit

    For purposes of the applicable amount used in calculating the 
section 45Y credit, section 45Y(a)(2) provides a base amount and a 
higher alternative amount. Section 45Y(a)(2)(A) provides that the 
applicable amount will be the base amount of 0.3 cents in the case of a 
qualified facility that does not satisfy the requirements for the 
higher alternative amount. Section 45Y(a)(2)(B) provides that the 
alternative amount of 1.5 cents applies in the case of any qualified 
facility (1) with a maximum net output of less than 1 megawatt (as 
measured in alternating current), (2) the construction of which begins 
prior to the date that is 60 days after the Secretary of the Treasury 
or her delegate

[[Page 47793]]

(Secretary) publishes guidance on the requirements of section 45Y(g)(9) 
(wage requirements) and section 45Y(g)(10) (apprenticeship 
requirements),\2\ or (3) that satisfies section 45Y(g)(9) and, with 
respect to the construction of such facility, satisfies section 
45Y(g)(10).
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    \2\ To meet this requirement, the construction of the qualified 
facility must begin prior to January 29, 2023. See proposed Sec.  
1.45Y-3 as proposed in the notice of proposed rulemaking (REG-
100908-23) published in the Federal Register (88 FR 60018) on August 
30, 2023, and corrected at 88 FR 73807 on October 27, 2023.
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    Section 45Y(c)(1) provides for an inflation adjustment for both the 
base and alternative amounts. Section 45Y(c)(1) provides that in the 
case of a calendar year beginning after 2024, the 0.3 cent amount in 
section 45Y(a)(2)(A) and the 1.5 cent amount in section 45Y(a)(2)(B) 
will each be adjusted by multiplying such amount by the inflation 
adjustment factor for the calendar year in which the sale, consumption, 
or storage of the electricity occurs. Section 45Y(c)(1) also addresses 
the rounding rules to be applied to this computation. Section 45Y(c)(2) 
provides that the Secretary will, not later than April 1 of each 
calendar year, determine and publish in the Federal Register the 
inflation adjustment factor for such calendar year in accordance with 
section 45Y(c).
    Section 45Y(g)(7) provides for an increase in the section 45Y 
credit amount for any qualified facility located in an energy 
community, and section 45Y(g)(11) provides for an increase in the 
section 45Y credit amount if the domestic content bonus requirement is 
satisfied.
    Section 45Y(g)(7) provides that in the case of any qualified 
facility that is located in an energy community (as defined in section 
45(b)(11)(B)), for purposes of determining the amount of the credit 
under section 45Y(a) with respect to any electricity produced by the 
taxpayer at such facility during the taxable year, the applicable 
amount under section 45Y(a)(2) will be increased by an amount equal to 
10 percent of the amount otherwise in effect under such paragraph.
    Section 45Y(g)(11) provides that in the case of any qualified 
facility that satisfies the domestic content bonus requirement under 
section 45Y(g)(11)(B)(i), the amount of the credit determined under 
section 45Y(a) will be increased by an amount equal to 10 percent of 
the amount so determined (as determined without application of section 
45Y(g)(7)). Section 45Y(g)(11)(B)(i) generally provides that the 
domestic content bonus requirement is satisfied with respect to any 
qualified facility if the taxpayer certifies to the Secretary (at such 
time, and in such form and manner, as the Secretary may prescribe) that 
any steel, iron, or manufactured product that is a component of such 
facility (upon completion of construction) was produced in the United 
States (as determined under section 661 of title 49, Code of Federal 
Regulations). Section 45Y(g)(11)(B)(iii) provides that for purposes of 
the domestic content bonus requirement, the manufactured products that 
are components of a qualified facility upon completion of construction 
will be deemed to have been produced in the United States if not less 
than the adjusted percentage (as determined under section 
45Y(g)(11)(C)) of the total cost of all such manufactured products of 
such facility are attributable to manufactured products (including 
components) that are mined, produced, or manufactured in the United 
States.

B. Qualified Facility

    Section 45Y(b) provides guidance on the meaning of a qualified 
facility for purposes of section 45Y. Subject to section 45Y(b)(1)(B) 
through (D), section 45Y(b)(1)(A) defines a qualified facility to mean 
a facility owned by the taxpayer that is used for the generation of 
electricity, that is placed in service after December 31, 2024, and for 
which the greenhouse gas emissions rate (as determined under section 
45Y(b)(2)) is not greater than zero.
    Section 45Y(b)(1)(B) provides that for purposes of section 45Y, a 
facility will only be treated as a qualified facility during the 10-
year period beginning on the date the facility was originally placed in 
service.
    Section 45Y(b)(1)(C) provides that a qualified facility will 
include a new unit or any additions of capacity that are placed in 
service after December 31, 2024, if in connection with a facility 
described in section 45Y(b)(1)(A) (without regard to section 
45Y(b)(1)(A)(ii) describing the requirement that the facility be placed 
in service after December 31, 2024) that was placed in service before 
January 1, 2025, but only to the extent of the increased amount of 
electricity produced at the facility due to the new unit or addition of 
capacity.
    Section 45Y(b)(1)(D) provides that a qualified facility will not 
include any facility for which a credit determined under section 45, 
45J, 45Q, 45U, 48, 48A, or 48E of the Code is allowed under section 38 
for the taxable year or any prior taxable year.
    Section 45Y(b)(2) describes the greenhouse gas emissions rate 
referenced in section 45Y(b)(1)(A)(iii). Section 45Y(b)(2)(A) defines 
greenhouse gas emissions rate for purposes of section 45Y to mean the 
amount of greenhouse gases emitted into the atmosphere by a facility in 
the production of electricity, expressed as grams of CO<INF>2</INF>e 
per kWh. Section 45Y(e)(1) defines CO<INF>2</INF>e per kWh for purposes 
of section 45Y to mean, with respect to any greenhouse gas, the 
equivalent carbon dioxide (as determined based on global warming 
potential) per kWh of electricity produced. Section 45Y(e)(2) defines 
greenhouse gas for purposes of section 45Y to have the same meaning 
given such term under section 211(o)(1)(G) of the Clean Air Act (CAA) 
(42 U.S.C. 7545(o)(1)(G)) as in effect on August 16, 2022.
    Section 45Y(b)(2)(B) provides that in the case of a facility that 
produces electricity through combustion or gasification, the greenhouse 
gas emissions rate (GHG emissions rate) for such facility is equal to 
the net rate of greenhouse gases emitted into the atmosphere by such 
facility (taking into account lifecycle greenhouse gas emissions, as 
described in section 211(o)(1)(H) of the CAA (42 U.S.C. 7545(o)(1)(H))) 
in the production of electricity, expressed as grams of CO<INF>2</INF>e 
per kWh.
    Section 45Y(b)(2)(C) provides for the establishment of GHG 
emissions rates for facilities either through the publication of 
emissions rates described in section 45Y(b)(2)(C)(i) or a provisional 
emissions rate as described in section 45Y(b)(2)(C)(ii). Section 
45Y(b)(2)(C)(i) states that the Secretary will annually publish a table 
that sets forth the GHG emissions rates for types or categories of 
facilities, that a taxpayer will use for purposes of section 45Y. 
Section 45Y(b)(2)(C)(ii) provides that in the case of any facility for 
which a GHG emissions rate has not been established by the Secretary, a 
taxpayer that owns such facility may file a petition with the Secretary 
for determination of the GHG emissions rate with respect to such 
facility.
    Section 45Y(b)(2)(D) provides that for purposes of section 45Y(b) 
the amount of greenhouse gases emitted into the atmosphere by a 
facility in the production of electricity cannot include any qualified 
carbon dioxide that is captured by the taxpayer and either (1) disposed 
of by the taxpayer in secure geological storage pursuant to any 
regulations established under section 45Q(f)(2), or (2) utilized by the 
taxpayer in a manner described in section 45Q(f)(5). Section 45Y(e)(3) 
defines qualified carbon dioxide for purposes of

[[Page 47794]]

section 45Y to mean carbon dioxide captured from an industrial source 
that would otherwise be released into the atmosphere as industrial 
emission of greenhouse gas, is measured at the source of capture and 
verified at the point of disposal or utilization, and is captured and 
disposed or utilized within the United States (within the meaning of 
section 638(1) of the Code) or a United States territory, which for 
purposes of section 45Y and the section 45Y regulations has the meaning 
of the term ``possession'' of the United States (within the meaning of 
section 638(2)).

C. Credit Phase-Out

    Section 45Y(d) describes the credit phase-out. Section 45Y(d)(1) 
provides generally that the amount of the clean electricity production 
credit under section 45Y(a) for any qualified facility the construction 
of which begins during a calendar year described in section 45Y(d)(2) 
is equal to the product of the amount of the credit determined under 
section 45Y(a) without regard to section 45Y(d), multiplied by the 
phase-out percentage under section 45Y(d)(2). Section 45Y(d)(2) 
provides that the phase-out percentage is 100 percent for a facility 
the construction of which begins during the first calendar year 
following the applicable year; 75 percent for a facility the 
construction of which begins during the second calendar year following 
the applicable year; 50 percent for a facility the construction of 
which begins during the third calendar year following the applicable 
year; and 0 percent for a facility the construction of which begins 
during any calendar year subsequent to the calendar year described in 
section 45Y(d)(2)(C). Section 45Y(d)(3) defines the ``applicable year'' 
for purposes of section 45Y(d) to mean the later of the calendar year 
in which the Secretary determines that the annual greenhouse gas 
emissions from the production of electricity in the United States are 
equal to or less than 25 percent of the annual greenhouse gas emissions 
from the production of electricity in the United States for calendar 
year 2022, or 2032.

D. Special Rules

    Section 45Y(g) provides special rules for section 45Y. Section 
45Y(g)(1) provides that consumption, sales, or storage is taken into 
account under section 45Y only with respect to electricity the 
production of which is within the United States (within the meaning of 
section 638(1)), or a United States territory, which for purposes of 
section 45Y and the section 45Y regulations has the meaning of the term 
``possession'' of the United States (within the meaning of section 
638(2)).
    Section 45Y(g)(2) provides a rule for combined heat and power 
system (CHP) property. For purposes of section 45Y(a), section 
45Y(g)(2)(A) generally provides that the kWh of electricity produced by 
a taxpayer at a qualified facility will include any production in the 
form of useful thermal energy by any CHP property within such facility, 
and the amount of greenhouse gases emitted into the atmosphere by such 
facility in the production of such useful thermal energy will be 
included for purposes of determining the GHG emissions rate for such 
facility. Section 45Y(g)(2)(B) defines CHP property for purposes of 
section 45Y(g)(2) to have the same meaning given such term by section 
48(c)(3) (without regard to section 48(c)(3)(A)(iv), (B), and (D) 
thereof). Section 45Y(g)(2)(C) provides the necessary conversion from 
BTU to kWh for a taxpayer to calculate a section 45Y credit for useful 
thermal energy produced by a CHP property.
    Section 45Y(g)(3) provides that in the case of a qualified facility 
in which more than one person has an ownership interest, except to the 
extent provided in regulations prescribed by the Secretary, production 
from the facility will be allocated among such persons in proportion to 
their respective ownership interests in the gross sales from such 
facility.
    Section 45Y(g)(4) provides that persons will be treated as related 
to each other if such persons would be treated as a single employer 
under the regulations prescribed under section 52(b). In the case of a 
corporation that is a member of an affiliated group of corporations 
filing a consolidated return, such corporation will be treated as 
selling electricity to an unrelated person if such electricity is sold 
to such a person by another member of such group.
    Section 45Y(g)(5) provides that under regulations prescribed by the 
Secretary, rules similar to the rules of section 52(d) will apply to a 
pass-thru in the case of estates and trusts.
    Section 45Y(g)(6) provides for the allocation of the credit to 
patrons of an agricultural cooperative.
    Section 45Y(g)(8) provides that rules similar to the rules of 
section 45(b)(3) will apply to a credit reduced for tax-exempt bonds.
    Section 45Y(g)(9) provides that rules similar to the rules of 
section 45(b)(7) apply with respect to wage requirements. Section 
45Y(g)(10) provides rules similar to the rules of section 45(b)(8) 
apply with respect to apprenticeship requirements.

II. Overview of Section 48E

    For purposes of the general business credit under section 38, which 
includes the investment credit under section 46, section 48E(a)(1) 
provides a credit for any taxable year in which a qualified investment 
is made with respect to any qualified facility and any energy storage 
technology (EST).

A. Amount of Credit

    The amount of the section 48E credit is equal to the applicable 
percentage of the qualified investment in any qualified facility and 
any EST. Section 48(E)(a)(2) provides a base rate and a higher 
alternative rate for the applicable percentage. Section 48E(a)(2)(A)(i) 
provides that in the case of a qualified facility that does not satisfy 
the requirements for the higher alternative rate, the base rate will be 
6 percent. Section 48E(a)(2)(A)(ii) provides that the alternative rate 
of 30 percent applies in the case of any qualified facility (1) with a 
maximum net output of less than 1 megawatt (as measured in alternating 
current), (2) the construction of which begins prior to the date that 
is 60 days after the Secretary publishes guidance on the prevailing 
wage requirements of section 48E(d)(3) and the apprenticeship 
requirements of section 48E(d)(4),\3\ or (3) that satisfies the 
prevailing wage requirements of section 48E(d)(3) and, with respect to 
the construction of such facility, satisfies the apprenticeship 
requirements of section 48E(d)(4).
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    \3\ To meet this requirement, the construction of the qualified 
facility must begin prior to January 29, 2023. See proposed Sec.  
1.48E-3 as proposed in the notice of proposed rulemaking (REG-
100908-23) published in the Federal Register (88 FR 60018) on August 
30, 2023, and corrected at 88 FR 73807 on October 27, 2023.
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    Similarly, section 48E(a)(2)(B)(ii) provides that the alternative 
rate of 30 percent applies in the case of an EST (1) with a capacity of 
less than 1 megawatt, (2) the construction of which begins prior to the 
date that is 60 days after the Secretary publishes guidance on the 
requirements of section 48E(d)(3) and (4) \4\ (prevailing wage and 
apprenticeship requirements, respectively), or (3) that satisfies 
section 48E(d)(3) and with respect to the construction of such EST, 
satisfies section 48E(d)(4). Section 48E(a)(2)(B)(i) provides that in 
the case of an EST that does not satisfy the requirements for the

[[Page 47795]]

alternative rate, the base rate will be 6 percent.
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    \4\ To meet this requirement, the construction of the EST must 
begin prior to January 29, 2023. See proposed Sec.  1.48E-3 as 
proposed in the notice of proposed rulemaking (REG-100908-23) 
published in the Federal Register at 88 FR 60018 on August 30, 2023, 
and corrected at 88 FR 73807 on October 27, 2023.
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    Section 48E(a)(3)(A) provides for an increase in credit rate for a 
qualified facility or EST located in an energy community (as defined in 
section 45(b)(11)(B)) and section 48E(a)(3)(B) similarly provides for 
an increase in credit rate for a qualified facility or EST that meets 
the domestic content bonus requirements.

B. Qualified Investment With Respect to a Qualified Facility

    Section 48E(b) describes a qualified investment with respect to a 
qualified facility. Generally, for purposes of section 48E(a), section 
48E(b)(1)(A) and (B)(i) provide that the qualified investment with 
respect to a qualified facility for any taxable year is the sum of the 
basis of any qualified property placed in service by the taxpayer 
during such taxable year that is part of a qualified facility, plus the 
amount of expenditures that are paid or incurred by the taxpayer for 
qualified interconnection property that is properly chargeable to 
capital account of the taxpayer.
    Section 48E(b)(2) provides that for purposes of section 48E, 
qualified property means property that is tangible personal property, 
or other tangible property (not including a building or its structural 
components), but only if such property is used as an integral part of 
the qualified facility; with respect to which depreciation (or 
amortization in lieu of depreciation) is allowable; and the 
construction, reconstruction, or erection of which is completed by the 
taxpayer, or that is acquired by the taxpayer provided the original use 
of such property commences with the taxpayer.
    Section 48E(b)(1)(B)(i)(I) and (II) provide that qualified 
interconnection property must be in connection with a qualified 
facility that has a maximum net output of not greater than 5 megawatts 
(as measured in alternating current) and be placed in service during 
the taxable year of the taxpayer. Section 48E(b)(4) provides that the 
term ``qualified interconnection property'' has the meaning given such 
term in section 48(a)(8)(B).
    Section 48E(b)(3)(A) provides that for purposes of section 48E, the 
term ``qualified facility'' means a facility that is used for the 
generation of electricity, which is placed in service after December 
31, 2024, and for which the anticipated GHG emissions rate (as 
determined under section 48E(b)(3)(B)(ii)) is not greater than zero.
    Section 48E(b)(3)(B) provides additional rules for a qualified 
facility. Section 48E(b)(3)(B)(i) provides rules on an expansion of 
facility and incremental production stating that rules similar to the 
rules of section 45Y(b)(1)(C) apply for purposes of section 48E(b)(3). 
Section 48E(b)(3)(B)(ii) provides rules to determine the GHG emissions 
rate of a qualified facility by stating that rules similar to the rules 
of section 45Y(b)(2) apply for purposes of section 48E(b)(3).
    Section 48E(b)(3)(C) provides that a qualified facility will not 
include any facility for which a renewable electricity production 
credit determined under section 45, an advanced nuclear power facility 
production credit determined under section 45J, a carbon oxide 
sequestration credit determined under section 45Q, a zero-emission 
nuclear power production credit determined under section 45U, a clean 
electricity production credit determined under section 45Y, an energy 
credit determined under section 48, or a qualifying advanced coal 
project credit under section 48A, is allowed under section 38 for the 
taxable year or any prior taxable year. Section 48E(b)(5) provides a 
rule for coordination with the rehabilitation credit stating that the 
qualified investment with respect to any qualified facility for any 
taxable year will not include that portion of the basis of any property 
that is attributable to qualified rehabilitation expenditures (as 
defined in section 47(c)(2) of the Code).
    Section 48E(b)(6) provides that for purposes of section 48E(b), the 
terms ``CO<INF>2</INF>e per kWh'' and ``greenhouse gas emissions rate'' 
have the same meaning given such terms under section 45Y. Section 
48E(f) provides that, in section 48E, the term ``greenhouse gas'' has 
the same meaning given such term under section 45Y(e)(2).

C. Qualified Investment With Respect to an Energy Storage Technology

    Section 48E(c) describes a qualified investment with respect to 
EST. For purposes of section 48E(a), section 48E(c)(1) provides that 
the qualified investment with respect to EST for any taxable year is 
the basis of any EST placed in service by the taxpayer during such 
taxable year. Section 48E(c)(2) provides that for purposes of section 
48E, the term ``energy storage technology'' has the meaning given such 
term in section 48(c)(6) (except that section 48(c)(6)(D) will not 
apply). Section 48(c)(6)(A)(i) defines ``energy storage technology'' to 
mean property (other than property primarily used in the transportation 
of goods or individuals and not for the production of electricity) that 
receives, stores, and delivers energy for conversion to electricity 
(or, in the case of hydrogen, which stores energy), and has a nameplate 
capacity of not less than 5 kWh. Section 48(c)(6)(A)(ii) provides that 
the term ``energy storage technology'' also includes thermal energy 
storage property. Section 48(c)(6)(B) describes a rule for 
modifications of certain property.
    Section 48(c)(6)(C)(i) defines ``thermal energy storage property'' 
to mean for purposes of section 48(c)(6), subject to section 
48(c)(6)(C)(ii), property comprising a system that is directly 
connected to a heating, ventilation, or air conditioning system, 
removes heat from, or adds heat to, a storage medium for subsequent 
use, and provides energy for the heating or cooling of the interior of 
a residential or commercial building. Section 48(c)(6)(C)(ii) describes 
the exclusion that thermal energy storage property will not include a 
swimming pool, combined heat and power system property, or a building 
or its structural components.
    Section 48E(d) provides special rules for section 48E, all of which 
refer to other provisions. Section 48E(d)(1) provides a rule for 
qualified progress expenditures, stating that rules similar to the 
rules of former section 46(c)(4) and (d) (as in effect on the day 
before the date of the enactment of the Revenue Reconciliation Act of 
1990) apply for purposes of section 48E(a).\5\ Section 48E(d)(2) 
provides a special rule for property financed by subsidized energy 
financing or private activity bonds, stating that rules similar to the 
rules of section 45(b)(3) apply. Section 48E(d)(3) provides a rule for 
prevailing wage requirements, stating that rules similar to the rules 
of section 48(a)(10) apply. Likewise, section 48E(d)(4) provides a rule 
for apprenticeship requirements stating that rules similar to the rules 
of section 45(b)(8) apply. Lastly, section 48E(d)(5) provides a rule 
for the domestic content requirement for elective payment stating that 
in the case of a taxpayer making an election under section 6417 with 
respect to a credit under section 48E, rules similar to the rules of 
section 45Y(g)(12) apply.
---------------------------------------------------------------------------

    \5\ The rules provided by Sec.  1.46-5 related to qualified 
progress expenditures apply for purposes of section 48E(a).
---------------------------------------------------------------------------

D. Credit Phase-Out

    Section 48E(e) describes the credit phase-out. Section 48E(e)(1) 
provides generally that the amount of the clean electricity investment 
credit under section 48E(a) for any qualified investment with respect 
to any qualified facility or EST the construction of which begins 
during a calendar year described in section 48E(e)(2) is equal to

[[Page 47796]]

the product of the amount of the credit determined under section 48E(a) 
without regard to section 48E(e), multiplied by the phase-out 
percentage under section 48E(e)(2). Section 48E(e)(2) provides that the 
phase-out percentage is 100 percent for any qualified investment with 
respect to any qualified facility or EST the construction of which 
begins during the first calendar year following the applicable year; 75 
percent for any qualified investment with respect to any qualified 
facility or EST the construction of which begins during the second 
calendar year following the applicable year; 50 percent for any 
qualified investment with respect to any qualified facility or EST the 
construction of which begins during the third calendar year following 
the applicable year; and 0 percent for any qualified investment with 
respect to any qualified facility or EST the construction of which 
begins during any calendar year subsequent to the calendar year 
described in section 48E(e)(2)(C). Section 48E(e)(3) defines the 
``applicable year'' for purposes of section 48E(e) to have the same 
meaning given such term in section 45Y(d)(3).

E. Recapture Rules

    For purposes of the recapture rules under section 50(a), section 
48E(g) provides a special recapture rule applicable to qualified 
facilities. Specifically, section 48E(g) provides that, for purposes of 
section 50, if the Secretary determines that the GHG emissions rate for 
a qualified facility is greater than 10 grams of CO<INF>2</INF>e per 
kWh, any property for which a credit was allowed under section 48E with 
respect to such facility ceases to be investment credit property in the 
taxable year in which the determination is made.

III. Notice 2022-49

    On October 24, 2022, the Treasury Department and the IRS published 
Notice 2022-49, 2022-43 I.R.B. 321. The notice requested general 
comments on issues arising under sections 45Y and 48E, as well as on 
issues relating to three other credits. For section 45Y, the notice 
specifically requested comments concerning (1) industry standards for 
taxpayer eligibility for the credit, (2) what the Treasury Department 
and the IRS should consider, including around the scope and factors, 
for the annual GHG emissions rate table, (3) whether guidance is needed 
to clarify cases in which a metering device is owned and operated by an 
unrelated person or in which electricity produced at such a qualified 
facility with such a device is sold, consumed or stored by the 
taxpayer, and (4) what procedures the Treasury Department and the IRS 
should provide for a taxpayer whose facility does not have an emissions 
rate established by the annual rate table, and what should the 
Secretary consider in making such a determination. For section 48E, the 
notice specifically requested comments concerning what industry 
mechanisms currently exist for a taxpayer to demonstrate eligibility 
for the credit.
    The Treasury Department and the IRS received over 100 comments 
specifically addressing sections 45Y and 48E from industry participants 
and other stakeholders. The Treasury Department and the IRS appreciate 
the commentors' interest and engagement on these issues. These comments 
have been carefully considered in the preparation of these proposed 
regulations.

IV. Prior Guidance

    On August 30, 2023, the Treasury Department and the IRS published a 
notice of proposed rulemaking and a notice of public hearing (REG-
100908-23) in the Federal Register (88 FR 60018), providing guidance on 
the prevailing wage and registered apprenticeship (PWA) requirements 
under sections 45, 45Y, 48, 48E and several other sections of the Code 
(August Proposed Regulations). The August Proposed Regulations also 
proposed guidance on the one-megawatt exception under sections 45, 45Y, 
48, and 48E (One-Megawatt Exception). Under this exception, with 
respect to certain facilities with a maximum net output (or capacity 
for energy storage technology under section 48E) of less than one 
megawatt, increased credit amounts are available.
    On November 22, 2023, the Treasury Department and the IRS published 
a notice of proposed rulemaking and a notice of public hearing (REG-
132569-17) in the Federal Register (88 FR 82188), providing guidance 
under section 48 of the Code. Among other matters, the proposed 
regulations under section 48 (Section 48 Proposed Regulations) withdrew 
and reproposed the regulations in Sec.  1.48-13 from the August 
Proposed Regulations regarding the PWA requirements under section 48, 
the One-Megawatt Exception under section 48(a)(9)(B)(i), and the 
recapture rules under section 48(a)(10)(C).

Explanation of Provisions

I. Rules Applicable to the Clean Electricity Production Tax Credit

    The proposed regulations under section 45Y are organized in five 
sections, proposed Sec. Sec.  1.45Y-1 through 1.45Y-5 (section 45Y 
regulations). Proposed Sec.  1.45Y-1 would provide an overview of the 
section 45Y regulations, generally applicable definitions, and general 
rules applicable to section 45Y, including a rule for calculating the 
credit for a CHP property. Proposed Sec.  1.45Y-2 would provide rules 
relating to qualified facilities for purposes of the section 45Y 
credit. Section 1.45Y-3 is reserved for rules relating to the increased 
credit amount for meeting the prevailing wage and apprenticeship 
requirements. A cross reference will be added to Sec.  1.45Y-3 in the 
final regulations after Sec.  1.45Y-3 is finalized. Proposed Sec.  
1.45Y-4 would provide the rules of general application under section 
45Y, including rules that attribute production to the taxpayer, rules 
for the expansion of a facility and incremental production, and rules 
for retrofits of an existing facility. Proposed Sec.  1.45Y-5 would 
provide rules pertaining to the determination of a GHG emissions rate 
for a facility under section 45Y.
A. Amount of Credit
    Proposed Sec.  1.45Y-1 would provide an overview of the section 45Y 
regulations and definitions of terms for purposes of the section 45Y 
regulations, including the terms ``combined heat and power system (CHP) 
property,'' ``metering device,'' ``related person,'' ``unrelated 
person,'' and ``qualified facility.''
    Proposed Sec.  1.45Y-1(a)(5)(i) would define, for purposes of 
section 45Y(a)(1)(A)(ii)(II), the term ``metering device'' as equipment 
that is owned and operated by an unrelated person (as defined in 
paragraph (a)(11) of this section) for energy revenue metering to 
measure and register the continuous summation of an electricity 
quantity with respect to time. Further, proposed Sec.  1.45Y-
1(a)(5)(ii) would provide standards for maintaining and operating a 
metering device for purposes of section 45Y(a)(1)(A)(ii)(II) and 
proposed Sec.  1.45Y-1(a)(5) by requiring a metering device to be 
maintained in proper working order according to the instructions of its 
manufacturer. Proposed Sec.  1.45Y-1(a)(5)(ii) would also provide that 
a metering device should meet the requirements of the American National 
Standards Institute C12.1-2022 standard, or subsequent revisions, be 
revenue grade with a +/-0.5% accuracy, and be properly calibrated. 
Proposed Sec.  1.45Y-1(a)(5)(iii) would provide that for purposes of 
monitoring the metering device, the unrelated person may share network 
equipment, such as spare fiber optic cable owned by the taxpayer that 
produces the electricity, and may co-locate network

[[Page 47797]]

equipment in the taxpayer's facilities. Proposed Sec.  1.45Y-
1(a)(5)(iv) would provide examples illustrating the proposed rules 
provided by proposed Sec.  1.45Y-1(a)(5).
    Proposed Sec.  1.45Y-1(a)(7)(i) would provide that for purposes of 
section 45Y(a), the term ``related person'' means a person who is 
related to another person if such person would be treated as a single 
employer under the regulations in 26 CFR chapter 1 under section 52(b) 
of the Code. Proposed Sec.  1.45Y-1(a)(7)(ii) would provide that in the 
case of a corporation that is a member of a consolidated group (as 
defined in Sec.  1.1502-1(h)), such corporation will be treated as 
selling electricity to an unrelated person if such electricity is sold 
to an unrelated person by another member of such group.
    Proposed Sec.  1.45Y-1(a)(11) would provide that for purposes of 
section 45Y(a), the term ``unrelated person'' means a person who is not 
a related person as defined in section 45Y(g)(4) and proposed Sec.  
1.45Y-1(a)(7). In the case of sales of electricity to an individual 
consumer, such sales will be treated as sales to an unrelated party for 
purposes of the section 45Y credit. Proposed Sec.  1.45Y-1(a)(11) 
provides an example illustrating the application of these rules.
    Proposed Sec.  1.45Y-1(b)(1) would describe the calculation of the 
section 45Y credit, providing that the credit is an amount equal to the 
product of the kWh of electricity that is produced by the taxpayer at a 
qualified facility (as defined in proposed Sec.  1.45Y-2(a)) and sold 
by the taxpayer to an unrelated person during the taxable year, 
multiplied by the applicable amount (as described in proposed Sec.  
1.45Y-1(b)) with respect to such qualified facility. Proposed Sec.  
1.45Y-1(b)(1) would further provide that in the case of a qualified 
facility that is equipped with a metering device that is owned and 
operated by an unrelated person, the section 45Y credit for any taxable 
year is an amount equal to the product of the kWh of electricity that 
is both produced at the qualified facility (as defined in proposed 
Sec.  1.45Y-2(a)) and sold, consumed, or stored by the taxpayer during 
the taxable year, multiplied by the applicable amount with respect to 
such qualified facility. Proposed Sec.  1.45Y-1(b)(1) would also 
provide that only one section 45Y credit may be claimed for each kWh of 
electricity produced by the taxpayer at a qualified facility.
    Proposed Sec.  1.45Y-1(b)(2)(i) would define the applicable amount 
as the base amount described in Sec.  1.45Y-1(b)(2)(ii) or the 
alternative amount described in Sec.  1.45Y-1(b)(2)(iii). Proposed 
Sec.  1.45Y-1(b)(2)(i) would further provide that the applicable amount 
is subject to the inflation adjustment as provided in section 45Y(c)(1) 
and proposed Sec.  1.45Y-1(b)(3), and that the applicable amount may 
also be increased as provided in section 45Y(g)(7)) and proposed Sec.  
1.45Y-1(b)(4), in the case of a qualified facility that is located in 
an energy community. Proposed Sec.  1.45Y-1(b)(2)(ii) would describe 
the base amount as 0.3 cents in the case of any qualified facility that 
does not satisfy the requirements provided in section 45Y(a)(2)(B). 
Proposed Sec.  1.45Y-1(b)(2)(iii) would describe the alternative amount 
as 1.5 cents if prevailing wage and apprenticeship requirements are 
satisfied as provided in section 45Y(a)(2)(B).
    Proposed Sec.  1.45Y-1(b)(3) would provide the rules related to the 
inflation adjustment factor applicable to the section 45Y credit. 
Proposed Sec.  1.45Y-1(b)(4) would provide the rules applicable to the 
energy communities increase in credit. Proposed Sec.  1.45Y-1(b)(5) 
would provide the domestic content bonus credit amount.
    Proposed Sec.  1.45Y-1(c) would provide the credit phase-out rules. 
Generally, proposed Sec.  1.45Y-1(c)(1) would provide that the amount 
of the clean electricity production credit under section 45Y(a) for any 
qualified facility the construction of which begins during a calendar 
year described in section 45Y(d)(2) is equal to the product of the 
amount of the credit determined under section 45Y(a) without regard to 
the credit phaseout rules of section 45Y(d) (credit phase-out), 
multiplied by the phase-out percentage provided in section 45Y(d)(2). 
Proposed Sec.  1.45Y-1(c)(2) would provide that the phase-out 
percentage is 100 percent for a facility the construction of which 
begins during the first calendar year following the applicable year; 75 
percent for a facility the construction of which begins during the 
second calendar year following the applicable year; 50 percent for a 
facility the construction of which begins during the third calendar 
year following the applicable year; and 0 percent for a facility the 
construction of which begins during any calendar year subsequent to the 
calendar year described in section 45Y(d)(2)(C).
    Proposed Sec.  1.45Y-1(c)(3) would define the ``applicable year'' 
for purposes of proposed Sec.  1.45Y-1(c) to mean the later of the 
calendar year in which the Secretary makes the determination that the 
annual greenhouse gas emissions from the production of electricity in 
the United States are equal to or less than 25 percent of the annual 
greenhouse gas emissions from the production of electricity in the 
United States for calendar year 2022, or 2032. Proposed Sec.  1.45Y-
1(c)(4) would provide that, for the purposes of determining the 
applicable year, the annual greenhouse gas emissions from the 
production of electricity in the United States for any year must be 
assessed separately using both the Energy Information Administration's 
(EIA) Electric Power Annual, using the sum of the annual carbon dioxide 
emissions data from conventional power plants and combined heat and 
power plants as currently listed in Table 9.1 and the Monthly Energy 
Review annual carbon dioxide emissions from the combustion of biomass 
to produce electricity in the electric power sector as currently listed 
in Table 11.7, and the U.S. Environmental Protection Agency (EPA) 
Inventory of U.S. Greenhouse Gas Emissions and Sinks (GHGI) annual 
electric power-related carbon dioxide, methane, and nitrous oxide 
emissions data including carbon dioxide emissions from the combustion 
of biomass to produce electricity. In the most current version of the 
GHGI, annual fossil and biogenic CO<INF>2</INF> from electricity 
production in the electric power sector is available in Table 2-11 and 
Tables 3-120 and 3-122, respectively; and CH<INF>4</INF> and 
N<INF>2</INF>O from electricity production in the electric power sector 
is available in Table 3-8 and Table 3-9, respectively. Based on current 
and publicly available data in the 2024 GHGI, the estimate for 2022 GHG 
emissions associated with the production of electricity is 1,613 
million metric tons (MMT) CO<INF>2</INF>e. Currently, explicit data on 
industrial and commercial sector GHG emissions from the production of 
electricity is not disaggregated from overall sectoral totals. See 
GHGI, <a href="https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks">https://www.epa.gov/ghgemissions/inventory-us-greenhouse-gas-emissions-and-sinks</a>.
    For 2022, the EIA Electric Power Annual states that the annual 
carbon dioxide emissions from conventional power plants and combined 
heat and power plants are 1,650 MMT, and the Monthly Energy Review 
annual carbon dioxide emissions from the combustion of biomass to 
produce electricity in the electric power sector are 35 MMT. Thus, the 
EIA's data reflects a total of 1,685 MMT in 2022. See EIA Electric 
Power Annual (<a href="https://www.eia.gov/electricity/annual">https://www.eia.gov/electricity/annual</a>); MER (<a href="https://eia.gov/totalenergy/monthly/">https://eia.gov/totalenergy/monthly/</a>).
    Proposed Sec.  1.45Y-1(c)(5) would provide that, for the purposes 
of determining the applicable year, the Secretary will make such 
determination only if the annual greenhouse gas emissions from the 
production of

[[Page 47798]]

electricity in the United States, as determined separately under both 
of the data sources described in proposed Sec.  1.45Y-1(c)(4), for the 
year is equal to or less than 25 percent of the annual greenhouse gas 
emissions from the production of electricity in the United States for 
calendar year 2022. Proposed Sec.  1.45Y-1(c)(5) would provide that if 
a data source described in proposed Sec.  1.45Y-1(c)(4) becomes 
unavailable (for example, it is no longer published or it does not 
provide the specified data), the Secretary must designate a similar 
data source to replace the unavailable data source. Requiring the 
applicable year to be determined using data from the EIA's Electric 
Power Annual and Monthly Energy Review and the EPA's GHGI ensures that 
this important determination is made transparently and based on 
reliable information. Both well-established data sources are 
representative of the annual greenhouse gas emissions from the 
production of electricity in the United States, but there are slight 
differences in the greenhouse gases and the emissions sources covered 
by each data source.
    There are other United States Government greenhouse gas datasets 
that could serve as the basis for the Secretary's determination as to 
whether the annual greenhouse gas emissions from the production of 
electricity in the United States are equal to or less than 25 percent 
compared to 2022. Two such datasets are the EPA Greenhouse Gas 
Reporting Program (GHGRP) and Emissions & Generation Resource 
Integrated Database (eGRID). The Treasury Department and the IRS 
request comment on which datasets are most appropriate to determine the 
applicable year and why.
    Proposed Sec.  1.45Y-1(d) would provide requirements for CHP 
property and special rules for calculating the section 45Y credit for 
CHP property. Proposed Sec.  1.45Y-1(d)(1) would provide that CHP 
property must produce at least 20 percent of its total useful energy in 
the form of thermal energy that is not used to produce electrical or 
mechanical power (or combination thereof), and at least 20 percent of 
its total useful energy in the form of electrical or mechanical power 
(or combination thereof). Proposed Sec.  1.45Y-1(d)(1) would further 
provide that the energy efficiency percentage of CHP property must 
exceed 60 percent, and that these percentages are determined on a 
British thermal unit (Btu) basis. Section 45Y(g)(2)(B) incorporates 
these requirements by providing that the term ``combined heat and power 
system property'' has the same meaning given such term by section 
48(c)(3) (without regard to section 48(c)(3)(A)(iv), (B), and (D)).
    Proposed Sec.  1.45Y-1(d)(2) would describe the energy efficiency 
percentage of a CHP property stating that it is the fraction the 
numerator of which is the total useful electrical, thermal, and 
mechanical power produced by the system at normal operating rates, and 
expected to be consumed in its normal application, and the denominator 
of which is the lower heating value of the fuel sources for the system, 
which is a measure of heat content based on the net energy content of a 
combustible fuel.
    Proposed Sec.  1.45Y-1(d)(3) would provide a special rule for 
calculating electricity produced by CHP property. For purposes of 
section 45Y(a) and proposed Sec.  1.45Y-1(b), the kWh of electricity 
produced by a taxpayer at a qualified facility will include any 
production in the form of useful thermal energy by any CHP property 
within such facility, and the amount of greenhouse gases emitted into 
the atmosphere by such facility in the production of such useful 
thermal energy will be included for purposes of determining the GHG 
emissions rate for such facility.
    Proposed Sec.  1.45Y-1(d)(3)(ii)(A) would provide a conversion from 
Btu to kWh. Proposed Sec.  1.45Y-1(d)(3)(ii))(A) would provide that for 
purposes of section 45Y(g)(2)(A)(i) and Sec.  1.45Y-1(d)(3), the amount 
of kWh of electricity produced in the form of useful thermal energy is 
equal to the quotient of the total useful thermal energy produced by 
the CHP property within the qualified facility, divided by the heat 
rate for such facility.
    Proposed Sec.  1.45Y-1(d)(3)(ii)(B) would define the term ``heat 
rate'' to mean the amount of energy used by the qualified facility to 
generate 1 kWh of electricity, expressed as Btus per net kWh generated. 
In calculating the heat rate of a qualified facility that includes CHP 
property that uses combustion, a taxpayer must use the annual average 
heat rate, defined as the total annual fuel consumption of the CHP 
property (in Btus, using the lower heating value of the fuel) during 
the taxable year for which the section 45Y credit is claimed, divided 
by the annual net electricity generation (in kWh) of the CHP property 
during such taxable year.
    Section 45Y(g)(2), by cross reference to section 48(c)(3), requires 
that the energy efficiency percentage of the CHP property must exceed 
60 percent, calculated as (1) the total useful electrical, thermal, and 
mechanical power produced by the system at normal operating rates, and 
expected to be consumed in its normal application, divided by (2) the 
lower heating value (LHV) of the fuel sources for the system. The LHV 
is calculated based on combustion. Some CHP property may not involve 
combustion, such as nuclear cogeneration. In these scenarios, because 
there is no calculable LHV, the energy efficiency percentage of the CHP 
property cannot be determined using the calculation provided in the 
statute.
    The Treasury Department and the IRS request comments regarding the 
application of the energy efficiency percentage requirements to CHP 
property for which there is no combustion. Relatedly, comment is 
requested on whether the existing definition of heat rate provided in 
section 45Y(g)(2)(C)(ii) for purposes of calculating the section 45Y 
credit for CHP property that does not use combustion should be 
clarified.
B. Qualified Facility
    Proposed Sec.  1.45Y-2(a) would define a ``qualified facility'' to 
mean a facility owned by the taxpayer and used for the generation of 
electricity, that is placed in service after December 31, 2024, and has 
a GHG emissions rate of not greater than zero (as determined under 
rules provided in proposed Sec.  1.45Y-5).
1. Property Included in Qualified Facility
    Proposed Sec.  1.45Y-2(b) would provide a description of the 
property included in a qualified facility. Proposed Sec.  1.45Y-2(b)(1) 
would provide that a qualified facility includes a unit of qualified 
facility (as defined in proposed Sec.  1.45Y-2(b)(2)(i)) that meets the 
requirements of proposed Sec.  1.45Y-2(b)(2)(ii). Proposed Sec.  1.45Y-
2(b)(1) would provide that a qualified facility also includes qualified 
property owned by the taxpayer that is an integral part of a qualified 
facility (as defined in proposed Sec.  1.45Y-2(b)(3)). Section 45Y is 
silent regarding the credit eligibility of components that are part of 
a qualified facility but located in different locations. Proposed Sec.  
1.45Y-2(b)(1) would clarify that any property that meets the 
requirements of a qualified facility described in proposed Sec.  1.45Y-
2(b) is part of a qualified facility, regardless of where such property 
is located. Proposed Sec.  1.45Y-2(b)(1) would provide that a qualified 
facility also generally does not include equipment that is an addition 
or modification to an existing qualified facility, however, proposed 
Sec.  1.45Y-2(b)(1) would reference proposed Sec.  1.45Y-4(c) for rules 
regarding the expansion of a facility or incremental production and 
proposed Sec.  1.45Y-4(d) for rules regarding a retrofitted qualified 
facility (80/20 Rule).

[[Page 47799]]

2. Unit of Qualified Facility
    Proposed Sec.  1.45Y-2(b)(2)(i) would provide that for purposes of 
the section 45Y credit, the unit of qualified facility includes all 
functionally interdependent components of property (as defined in 
proposed Sec.  1.45Y-2(b)(2)(ii)) owned by the taxpayer that are 
operated together and that can operate apart from other property to 
produce electricity. Proposed Sec.  1.45Y-2(b)(2)(i) would clarify that 
no provision of proposed Sec.  1.45Y-1, or proposed Sec.  1.45Y-4 
through Sec.  1.45Y-5 uses the term ``unit'' in respect of a qualified 
facility with any meaning other than that provided in proposed Sec.  
1.45Y-2(b)(2)(i). A reference to Sec.  1.45Y-3 will also be added to 
the previous sentence in proposed Sec.  1.45Y-2(b)(2)(i) when proposed 
Sec.  1.45Y-2(b)(2)(i) is finalized, but it cannot be added until Sec.  
1.45Y-3 is finalized.
    Proposed Sec.  1.45Y-2(b)(2)(ii) would provide that components are 
functionally interdependent if placing in service each component is 
dependent upon placing in service other components to produce 
electricity. See the discussion in section I.A. of the Explanation of 
Provisions regarding the special rule for CHP property.
3. Integral Part
    Proposed Sec.  1.45Y-2(b)(3)(i) would provide that for purposes of 
thesection 45Ycredit, a component of property owned by a taxpayer is an 
integral part of a facility if it is used directly in the intended 
function of the qualified facility and is essential to the completeness 
of such function.
    Proposed Sec.  1.45Y-2(b)(3)(ii) would provide that components of 
property that are an integral part of a qualified facility include 
power conditioning equipment and transfer equipment. Proposed Sec.  
1.45Y-2(b)(3)(ii) would provide that power conditioning equipment 
includes equipment that modifies the characteristics of electricity 
into a form suitable for use or transmission or distribution. Proposed 
Sec.  1.45Y-2(b)(3)(ii) would provide that parts related to the 
functioning or protection of power conditioning equipment are also 
treated as power conditioning equipment and includes examples.
    Proposed Sec.  1.45Y-2(b)(3)(ii) would provide that transfer 
equipment includes components that permit the aggregation of 
electricity generated by components of qualified facilities and 
components that alter voltage in order to permit transfer to a 
transmission or distribution line. Proposed Sec.  1.45Y-2(b)(3)(ii) 
would also clarify that transfer equipment does not include 
transmission or distribution lines. Proposed Sec.  1.45Y-2(b)(3)(ii) 
would provide that examples of transfer equipment include, but are not 
limited to, wires, cables, and combiner boxes that conduct electricity. 
Proposed Sec.  1.45Y-2(b)(3)(ii) would provide that parts related to 
the functioning or protection of transfer equipment are also treated as 
transfer equipment and include examples.
    Proposed Sec.  1.45Y-2(b)(3)(iii) would provide that roads that are 
an integral part of a qualified facility are those roads integral to 
the intended function of the qualified facility, such as onsite roads 
that are used to operate and maintain the qualified facility. Proposed 
Sec.  1.45Y-2(b)(3)(iii) would also clarify that roads used primarily 
for access to the site, or roads used primarily for employee or visitor 
vehicles, are not integral to the intended function of the qualified 
facility and thus are not an integral part of a qualified facility.
    Proposed Sec.  1.45Y-2(b)(3)(iv) and (v) would also provide that 
fences and buildings (also referred to as structures) are generally not 
integral parts of a qualified facility because they are not integral to 
the intended function of the qualified facility. However, a building 
(or structure) may be an integral part of a qualified facility if it is 
essentially an item of machinery or equipment and a structure that 
houses components of property that are integral to the intended 
function of the qualified facility if the use of the structure is so 
closely related to the use of the housed components of property therein 
that the structure clearly can be expected to be replaced if the 
components of property it initially houses are replaced.
    Proposed Sec.  1.45Y-2(b)(3)(vi) would provide a rule for shared 
integral property by stating that multiple qualified facilities 
(whether owned directly by one or more taxpayers), including qualified 
facilities with respect to which a taxpayer has claimed a credit under 
section 45Y or section 48E, may include shared property that can be 
considered an integral part of each qualified facility. Proposed Sec.  
1.45Y-2(b)(3)(vi) would also provide that a component of property that 
is shared by a qualified facility (as defined in section 45Y(b)) (45Y 
Qualified Facility) and a qualified facility (as defined in section 
48E(b)(3)) (48E Qualified Facility) that is an integral part of both 
qualified facilities will not affect the eligibility of the section 45Y 
Qualified Facility to claim the section 45Y credit or the section 48E 
Qualified Facility to claim a section 48E credit. Proposed Sec.  1.45Y-
2(b)(3)(vii) would provide examples illustrating proposed Sec.  1.45Y-
2(b)(3).
4. Coordination With Other Credits
    Proposed Sec.  1.45Y-2(c)(1) would provide that the term 
``qualified facility'' (as defined in section 45Y(b)) will not include 
any facility for which a credit determined under section 45, 45J, 45Q, 
45U, 48, 48A, or 48E is allowed under section 38 of the Code for the 
taxable year or any prior taxable year. Proposed Sec.  1.45Y-2(c)(1) 
would further clarify that a taxpayer that directly owns a qualified 
facility (as defined in section 45Y(b)) that is eligible for both a 
section 45Y credit and another Federal income tax credit is eligible 
for the section 45Y credit only if the other Federal income tax credit 
was not allowed with respect to the qualified facility. Proposed Sec.  
1.45Y-2(c)(1) would also add that nothing in Sec.  1.45Y-2(c) precludes 
a taxpayer from claiming a section 45Y credit with respect to a 
qualified facility (as defined in section 45Y(b)) that is co-located 
with another facility for which a credit determined under section 45, 
45J, 45Q, 45U, 48, 48A, or 48E is allowed under section 38 for the 
taxable year or any prior taxable year. Proposed Sec.  1.45Y-2(c)(2) 
would clarify that for purposes of proposed Sec.  1.45Y-2(c)(1), the 
term ``allowed'' only includes credits that taxpayers have claimed on a 
Federal income tax return or Federal return, as appropriate, and that 
the IRS has not challenged in terms of the taxpayer's eligibility. 
Proposed Sec.  1.45Y-2(c)(3) includes several examples illustrating the 
rules of Sec.  1.45Y-2(c).
C. Rules of General Application to Section 45Y
1. Only Production in the United States Taken Into Account
    Proposed Sec.  1.45Y-4(a) would provide that consumption, sales, or 
storage of electricity are taken into account for purposes of the 
section 45Y credit only with respect to electricity produced within the 
United States (as defined in section 638(1)), or a United States 
territory, which for purposes of section 45Y and the section 45Y 
regulations has the meaning of the term ``possession'' of the United 
States (as defined in section 638(2)).
2. Production Attributable to the Taxpayer and Section 761(a) Elections
    Proposed Sec.  1.45Y-4(b)(1) would provide that in the case of a 
qualified facility in which more than one person has an ownership share 
(and such arrangement is not treated as a partnership for Federal tax 
purposes), production from the qualified facility is

[[Page 47800]]

allocated among such persons in proportion to their respective 
ownership share in the gross sales from such qualified facility during 
the taxable year. The respective owners each determine their respective 
section 45Y credit under section 45Y(a) based on their respective 
ownership shares in the gross sales from such qualified facility. 
Proposed Sec.  1.45Y-4(b)(2) would provide an example demonstrating the 
application of this rule.
    Proposed Sec.  1.45Y-4(b)(3) would provide that if a qualified 
facility is owned through an unincorporated organization that has made 
a valid election under section 761(a) of the Code, each member's 
undivided ownership share in the qualified facility will be treated as 
a separate qualified facility owned by such member.
3. Expansion of Facility; Incremental Production
    Proposed Sec.  1.45Y-4(c)(1) would provide, solely for purposes of 
proposed Sec.  1.45Y-4(c), that the term ``qualified facility'' 
includes either a new unit or an addition of capacity placed in service 
after December 31, 2024, in connection with a facility described in 
section 45Y(b)(1)(A) (without regard to clause (ii) of such paragraph), 
which was placed in service before January 1, 2025, but only to the 
extent of the increased amount of electricity produced at the facility 
by reason of such new unit or addition of capacity. Proposed Sec.  
1.45Y-4(c)(1) would also provide that a new unit or an addition of 
capacity will be treated as a separate qualified facility. Proposed 
Sec.  1.45Y-4(c)(1) would provide for purposes of proposed Sec.  1.45Y-
4(c), that a new unit or an addition of capacity require the addition 
or replacement of components of property, including any new or 
replacement integral property, added to a facility necessary to 
increase capacity. If applicable for purposes of proposed Sec.  1.45Y-
4(c), taxpayers must use modified or amended facility operating 
licenses or the International Standard Organization (ISO) conditions to 
measure the maximum electrical generating output of a facility to 
determine its nameplate capacity. Additionally, proposed Sec.  1.45Y-
4(c)(1) would provide that for purposes of section 45Y(a)(2)(B)(i) 
(that is, the One-Megawatt Exception), the capacity for a new unit or 
an addition of capacity is the sum of the nameplate capacity of the 
added qualified facility and the nameplate capacity of the facility to 
which the qualified facility was added.
    Proposed Sec.  1.45Y-4(c)(2) would provide that solely for purposes 
of Sec.  1.45Y-4(c), a facility that is decommissioned or in the 
process of decommissioning and restarts can be considered to have 
increased capacity if the following conditions are met: (1) the 
existing facility must have ceased operations; (2) the existing 
facility must have a shutdown period of at least one calendar year 
during which it is without a valid operating license from its 
respective Federal regulatory authority (that is, the Federal Energy 
Regulatory Commission (FERC) or the Nuclear Regulatory Commission 
(NRC)); and (3) the increased capacity of the restarted facility must 
have a new, reinstated, or renewed operating license issued by either 
FERC or NRC.
    Proposed Sec.  1.45Y-4(c)(3) would describe how to compute the 
increased amount of electricity produced as a result of a new unit or 
an addition of capacity. Proposed Sec.  1.45Y-4(c)(3) would provide 
that to determine the increased amount of electricity produced by a 
facility by reason of a new unit or an addition of capacity, a taxpayer 
must multiply the amount of electricity that the facility produces 
during a taxable year after the new unit or addition of capacity is 
placed in service by a fraction, the numerator of which is the added 
nameplate capacity that results from the new unit or addition of 
capacity, and the denominator of which is the total nameplate capacity 
of the facility with the new unit or addition of capacity added.
    Proposed Sec.  1.45Y-4(c)(4) would illustrate the application of 
these rules to determine the increased amount of electricity 
attributable to a new unit or an addition of capacity described in 
Sec.  1.45Y-4(c).
4. Retrofit of an Existing Facility (80/20 Rule)
    Proposed Sec.  1.45Y-4(d)(1) would provide that for purposes of 
section 45Y(b)(1)(B), a facility may qualify as originally placed in 
service even if it contains some used components of property within the 
unit of qualified facility, provided the fair market value of the used 
components of the unit of qualified facility is not more than 20 
percent of the total value of the unit of qualified facility (that is, 
the cost of the new components of property plus the fair market value 
of the used components of property within the unit of qualified 
facility) (80/20 Rule). Proposed Sec.  1.45Y-4(d)(1) would further 
provide that if a facility satisfies the requirements of the 80/20 
Rule, then the date on which such qualified facility is considered 
originally placed in service for purposes of section 45Y(B)(1)(b) is 
the date on which the new components of property of the unit of 
qualified facility are placed in service. Proposed Sec.  1.45Y-4(d)(2) 
would provide that, for purposes of this 80/20 Rule, the cost of new 
components of the unit of qualified facility includes all costs 
properly included in the depreciable basis of the new components of 
property. Lastly, proposed Sec.  1.45Y-4(d)(3) would provide examples 
demonstrating the 80/20 Rule.
D. Greenhouse Gas Emissions Rates
    Section 45Y(b)(2) provides rules for determining GHG emissions 
rates. Proposed Sec.  1.45Y-5(a) would provide an overview of the rules 
pertaining to GHG emissions rates for facilities under section 45Y.
1. Definitions Related to Greenhouse Gas Emissions Rates
    Proposed Sec.  1.45Y-5(b) would provide definitions of terms 
relevant to determining GHG emissions rates. Section 45Y(e)(1) defines 
the term ``CO<INF>2</INF>e per kWh'' as, with respect to any greenhouse 
gas, the equivalent carbon dioxide (as determined based on global 
warming potential) per kWh of electricity produced. Proposed Sec.  
1.45Y-5(b)(1) would clarify that the term ``CO<INF>2</INF>e per kWh'' 
means with respect to any greenhouse gas, the equivalent carbon dioxide 
(as determined based on the 100-year time horizon global warming 
potential (GWP-100)) per kWh of electricity produced. Proposed Sec.  
1.45Y-5(b)(1) would also provide global warming potentials for certain 
greenhouse gases from the Intergovernmental Panel on Climate Change's 
Fifth Assessment Report (AR5).
    Proposed Sec.  1.45Y-5(b)(8) would provide that the term ``fuel'' 
means material directly used to produce electricity or energy inputs 
that are used to produce electricity. Proposed Sec.  1.45Y-5(b)(9) 
would provide that the term ``feedstock'' means any raw material used 
in a process for electricity generation or to produce an intermediate 
product or finished fuel used for electricity generation.
    Section 45Y(b)(2)(B) provides rules for determining a GHG emissions 
rate for a facility that produces electricity through combustion or 
gasification. Proposed Sec.  1.45Y-5(b)(2) would provide that the term 
``combustion'' means a rapid exothermic chemical reaction, specifically 
the oxidation of a fuel, which liberates energy including heat and 
light. This proposed definition of ``combustion'' would include, for 
example, burning fossil fuels, but it would not include the reaction 
that produces electricity inside a fuel cell.

[[Page 47801]]

    Gasification produces fuel but not electricity. Proposed Sec.  
1.45Y-5(b)(3) would provide that the term ``gasification'' means a 
thermochemical process that converts carbon-containing materials into 
syngas, a gaseous mixture that is composed primarily of carbon 
monoxide, carbon dioxide, and hydrogen. Because gasification does not 
produce electricity, the inclusion of the term ``gasification'' as a 
category separate from ``combustion'' in section 45Y(b)(2)(B) would 
have no independent significance unless it is interpreted as applying 
to the production of an energy source that is ultimately used by the 
facility to generate electricity (for example, syngas used to make 
electricity). Thus, proposed Sec.  1.45Y-5(b)(4) would interpret the 
phrase ``facility which produces electricity through combustion or 
gasification'' in section 45Y(b)(2)(B) as applying to facilities that 
produce electricity through combustion or use an input energy source to 
produce electricity, which energy source was produced through a 
fundamental transformation, or multiple transformations, of one energy 
source into another using combustion or gasification. The Treasury 
Department and the IRS request comment on this proposed interpretation, 
including whether the application of this proposed interpretation 
should be clarified with respect to any type of fundamental 
transformation of an energy source and any related activities or 
operations. Comment is also requested on supply chain tracing 
requirements that the Treasury Department and the IRS may apply to 
verify whether or not a feedstock or fuel (including energy inputs) 
used by a facility to produce electricity was produced using combustion 
or gasification.
    Section 45Y(b)(2)(B) provides that in the case of electricity 
produced through combustion or gasification, the GHG emissions rate for 
such facility is equal to the net rate of greenhouse gases emitted into 
the atmosphere by such facility (taking into account lifecycle 
greenhouse gas emissions, as described in section 211(o)(1)(H) of the 
CAA (42 U.S.C. 7545(o)(1)(H)) in the production of electricity. 
Proposed Sec.  1.45Y-5(b)(4) would provide that a ``facility that 
produces electricity through combustion or gasification'' (C&G 
Facility) means a facility that produces electricity through combustion 
or uses an input energy source to produce electricity, if the input 
energy source was produced through a fundamental transformation, or 
multiple transformations, of one energy source into another using 
combustion or gasification. Under proposed Sec.  1.45Y-5(b)(4), a 
facility that produces electricity using any fuel that was produced 
using electricity that had been produced, in whole or in part, from the 
combustion of fossil fuels would be considered a C&G Facility. For 
example, a hydrogen fuel cell would be considered a C&G Facility if it 
produced electricity using hydrogen that was produced by an 
electrolyzer powered, in whole or in part, by electricity from the grid 
because some of the electricity from the grid was produced through 
combustion or gasification. A fuel cell facility such as a solid oxide 
fuel cell, which uses methane as fuel, would be considered a C&G 
Facility, because the methane reforming reaction that produces syngas 
within the fuel cell prior to the production of electricity would be 
considered a gasification reaction. In contrast, a hydrogen fuel cell 
facility using hydrogen produced exclusively using electricity from a 
new solar array or wind farm co-located with the hydrogen fuel cell 
facility would not be considered a C&G Facility, because the input 
energy source was not produced through a transformation of one energy 
source into another using combustion or gasification.
    The Treasury Department and the IRS request comment on whether the 
proposed definitions of gasification, combustion, and C&G Facility 
would result in certain types of fuel cells that use fossil or biogenic 
fuel inputs (via combustion or gasification) to produce electricity 
being unable to demonstrate a net rate of greenhouse gas emissions that 
is not greater than zero with a lifecycle analysis because they are not 
classified as a C&G Facility as defined in proposed Sec.  1.45Y-
5(b)(4). Because the energy transformation that produces electricity in 
a fuel cell would not be considered combustion under the definition in 
proposed Sec.  1.45Y-5(b)(2), a fuel cell facility would only qualify 
as a C&G Facility if the fuel it used to produce electricity was 
produced through combustion or gasification under these proposed 
regulations.
    Proposed Sec.  1.45Y-5(b)(7) would provide that a ``Non-C&G 
Facility'' means a facility that produces electricity and is not 
described in proposed Sec.  1.45Y-5(b)(4).
    Proposed Sec.  1.45Y-5(b)(5) would provide that, consistent with 
section 45Y(b)(2)(A), the term ``greenhouse gas emissions rate'' means 
the amount of greenhouse gases emitted into the atmosphere by a 
facility in the production of electricity, expressed as grams of 
CO<INF>2</INF>e per kWh.
    Proposed Sec.  1.45Y-5(b)(6) would provide that, for the purposes 
of section 45Y(b)(2)(A), for both C&G Facilities and Non-C&G 
Facilities, the term ``greenhouse gases emitted into the atmosphere by 
a facility in the production of electricity'' means emissions from a 
facility that directly occur from the process that transforms the input 
energy source into electricity. Proposed Sec.  1.45Y-5(b)(6)(i) through 
Sec.  1.45Y-5(b)(6)(vi) would exclude emissions that may relate to a 
facility but do not occur ``in the production of electricity'' as 
specified in section 45Y(b)(2)(A). Proposed Sec.  1.45Y-5(c)(1) would 
provide, for Non-C&G Facilities only, additional types of excluded 
emissions under section 45Y(b)(2)(A). Proposed Sec.  1.45Y-5(d)(2) 
would provide, for C&G Facilities only, that additional rules on 
included and excluded emissions apply in order to conduct a lifecycle 
analysis as required by section 45Y(b)(2)(B).
    Proposed Sec.  1.45Y-5(b)(6)(i) through Sec.  1.45Y-5(b)(6)(vi) 
would clarify that for the purposes of both Non-C&G and C&G Facilities 
this definition excludes: (1) emissions from back-up generators that 
are primarily used in maintaining critical systems in case of a power 
system outage or for supporting restart of a generator after an outage; 
(2) emissions from routine operational and maintenance activities that 
are integral to the production of electricity, including, but not 
limited to, emissions from internal combustion vehicles used to access 
and perform maintenance on remote electricity generating facilities or 
emissions occurring from heating and cooling control rooms or dispatch 
centers; (3) emissions from a step-up transformer that conditions the 
electricity into a form suitable for productive use or sale; (4) 
emissions that occur before commercial operations commence or after 
commercial operations terminate, including, but not limited to, on-site 
emissions occurring from construction or manufacturing of the facility 
itself, emissions from the off-site manufacturing of facility 
components, or emissions occurring due to siting or decommissioning; 
(5) emissions from infrastructure associated with the facility, 
including, but not limited to, emissions from road construction for 
feedstock production; and (6) emissions from the distribution of 
electricity to consumers.
2. Greenhouse Gas Emissions Rates for Non-C&G Facilities
    Proposed Sec.  1.45Y-5(c) would provide the rules for determining a 
GHG emissions rate for Non-C&G Facilities, including by the Secretary 
when

[[Page 47802]]

publishing a table described in section 45Y(b)(2)(C)(i) or determining 
an emissions rate as provided in section 45Y(b)(2)(C)(ii). Proposed 
Sec.  1.45Y-5(c)(1) would provide that GHG emissions rates for Non-C&G 
Facilities must be determined under proposed Sec.  1.45Y-5(c) and (e). 
In addition, proposed Sec.  1.45Y-5(c)(1)(i) would provide that, with 
respect to Non-C&G Facilities only, greenhouse gases emitted into the 
atmosphere by a facility in the production of electricity excludes 
emissions of greenhouse gases that are not directly produced by the 
fundamental transformation of the input energy source into electricity, 
including, but not limited to, the following: (1) emissions from 
hydropower reservoirs due to anoxic conditions; (2) ebullitive, 
diffuse, and degassing emissions from hydropower operations; (3) 
emissions of non-condensable gases from underground reservoirs during 
geothermal operations; (4) emissions from a step-up transformer that 
conditions the electricity into a form suitable for productive use or 
sale; and (5) emissions occurring due to activities and operations 
occurring off-site, including but not limited to, the production and 
transportation of fuels used by the facility, or land use change from 
siting or changes in demand. Proposed Sec.  1.45Y-5(c)(1)(i) would thus 
exclude emissions that may relate to a Non-C&G Facility but do not 
occur ``in the production of electricity'' as specified in section 
45Y(b)(2)(A) because such emissions do not arise directly from the 
transformation of the input energy source into electricity. For 
example, emissions from land use change from siting or changes in 
demand would be excluded because such emissions do not occur ``in the 
production of electricity'' for Non-C&G Facilities under section 
45Y(b)(2)(A), but this exclusion does not apply to C&G Facilities 
because section 45Y(b)(2)(B) requires a broader standard for assessing 
GHG emissions than section 45Y(b)(2)(A).
    Proposed Sec.  1.45Y-5(c)(1)(ii) would provide that, subject to 
proposed Sec.  1.45Y-5(b)(6) and (c)(1), a GHG emissions rate for a 
Non-C&G Facility must be determined through a technical and engineering 
assessment of the fundamental energy transformation into electricity, 
and that such assessment must consider all input and output energy 
carriers and chemical reactions or mechanical processes taking place at 
the facility in the production of electricity. Proposed Sec.  1.45Y-
5(c)(1)(iii) would provide an example of a GHG emissions rate 
determination for a Non-C&G Facility.
    Proposed Sec.  1.45Y-5(c)(2) would identify certain types or 
categories of facilities that are categorically Non-C&G Facilities with 
a GHG emissions rate that is not greater than zero. Proposed Sec.  
1.45Y-5(c)(2)(i) through (viii) would provide that these include wind 
facilities (including small wind properties), hydropower facilities 
(including retrofits adding power production to non-powered dams, 
conduit hydropower, hydropower using new impoundments, and hydropower 
using diversions such as a penstock or channel), marine and 
hydrokinetic facilities, solar facilities (including photovoltaic and 
concentrating solar power), geothermal facilities (including flash and 
binary plants), nuclear fission facilities, nuclear fusion facilities, 
and waste energy recovery property (WERP) that derives energy from any 
of the energy sources described in proposed Sec.  1.45Y-5(c)(2)(i) 
through (vii) (including geothermal or solar waste heat recovery such 
as from a district geothermal heating system, and waste heat recovery 
such as from a nuclear reactor dedicated to heat production for an 
industrial facility).
    WERP is property that generates electricity solely from heat from 
buildings or equipment if the primary purpose of such building or 
equipment is not the generation of electricity. Examples of buildings 
or equipment the primary purpose of which is not the generation of 
electricity include, but are not limited to, manufacturing plants, 
medical care facilities, facilities on school campuses, pipeline 
compressor stations, and associated equipment. The Treasury Department 
and the IRS request comment on whether this definition of WERP is 
appropriate. Comment is further requested on whether and why it would 
be appropriate to revise proposed Sec.  1.45Y-5(c)(2)(viii) to include 
additional energy sources (such as energy from exothermic chemical 
reactions or pressure drop technologies) that do not rely on combustion 
or gasification but could include equipment related to the transport of 
fossil fuels (for example, natural gas).
    For purposes of proposed Sec.  1.45Y-5(c)(2)(ii), hydropower 
includes retrofits that add electricity production to non-powered dams, 
conduit hydropower, hydropower using new impoundments, and hydropower 
using diversions such as a penstock or channel. Greenhouse gas 
emissions are not created by the fundamental transformation of 
electricity needed to produce electricity in a hydropower facility. A 
hydropower facility converts the potential energy of flowing water into 
electricity. The potential energy results from changes in gravitational 
potential energy from the flowing water, which the hydropower facility 
captures with a turbine which spins a rotor within a generator to 
produce electricity. Hydropower facilities may release greenhouse gas 
emissions from the hydropower reservoir due to diffusion at the water 
surface or due to ebullition, and from degassing when water passes 
through a pump house or turbine. Such emissions from hydropower 
facilities would not be considered greenhouse gases emitted into the 
atmosphere by a Non-C&G Facility in the production of electricity under 
proposed Sec.  1.45Y-5(b)(6)(C), because emissions of greenhouse gasses 
are not created by the fundamental transformation of potential energy 
in flowing water into electricity, but rather from processes that are 
not fundamental to the transformation of potential energy into 
electricity.
    Similarly, greenhouse gas emissions are not created by the 
fundamental transformation of energy from high-pressure hot water into 
electricity in a flash geothermal facility, which is included in 
proposed Sec.  1.45Y-5(c)(2)(v). A flash geothermal facility uses high-
pressure hot water from deep inside the earth and converts it directly 
to steam that drives a turbine and generator. After the steam passes 
through the turbine, it is released into the atmosphere and any non-
condensable gases including greenhouse gases dissolved in the steam are 
also released. Such emissions from flash geothermal facilities would 
not be considered greenhouse gases emitted into the atmosphere by a 
facility in the production of electricity under proposed Sec.  1.45Y-
5(c)(1)(i)(C), because the greenhouse gases are already present in the 
underground water and are not created by the fundamental transformation 
of the thermal energy in the water into electricity, but rather by 
processes that are not fundamental to the transformation of the thermal 
energy into electricity. This proposed treatment of flash geothermal 
facilities is supported by surveys indicating that underground carbon 
dioxide in certain geothermal reservoirs is emitted passively into the 
atmosphere even in the absence of geothermal electricity generation. 
The Treasury Department and the IRS request comment on whether the 
identification of flash geothermal facilities as Non-C&G Facilities 
with a GHG emissions rate that is not greater than zero in proposed 
Sec.  1.45Y-5(c)(2)(v) is appropriate.

[[Page 47803]]

    For purposes of proposed Sec.  1.45Y-5(c)(2)(iv), solar includes 
concentrated solar power. Concentrated solar power facilities may have 
auxiliary burners that in some cases use combustion exclusively for the 
purposes of cold starts or freeze protection of thermal working fluids, 
but in other cases, may also be used to generate electricity in hybrid 
configurations. The Treasury Department and the IRS request comment on 
whether the existing definitions of C&G Facilities and Non-C&G 
Facilities is sufficient to distinguish between these two categories of 
facilities, or whether additional clarification is needed.
3. Greenhouse Gas Emissions Rates for C&G Facilities
    Section 45Y(b)(2)(B) provides that in the case of electricity 
produced through combustion or gasification, the GHG emissions rate for 
such facility is equal to the net rate of greenhouse gases emitted into 
the atmosphere by such facility (taking into account lifecycle 
greenhouse gas emissions, as described in section 211(o)(1)(H) of the 
CAA) in the production of electricity.
    Section 211(o)(1)(H) of the CAA provides that ``lifecycle 
greenhouse gas emissions'' means the aggregate quantity of greenhouse 
gas emissions (including direct emissions and significant indirect 
emissions such as significant emissions from land use changes) related 
to the full fuel lifecycle, including all stages of fuel and feedstock 
production and distribution, from feedstock generation or extraction 
through the distribution and delivery and use of the finished fuel to 
the ultimate consumer, if the mass values for all greenhouse gases are 
adjusted to account for their relative global warming potential.
    The EPA promulgated its interpretation of section 211(o)(1)(H) of 
the CAA in a 2010 notice-and-comment rulemaking establishing the 
regulatory framework for the updated renewable fuel standard (RFS2) 
program. The EPA interpreted section 211(o)(1)(H) of the CAA in the 
context of the facts and policy framework of the RFS program and based 
on information available at that time; however, the EPA's analysis and 
implementation of the RFS2 rule offer relevant precedent for the 
Treasury Department's and the IRS's interpretation of section 
45Y(b)(2)(B). In the RFS2 rulemaking, the EPA interpreted 211(o)(1)(H) 
of the CAA as requiring the agency to account for the real-world 
emissions consequences of increased production of biofuels. Thus, the 
EPA determined in the RFS2 context that the inclusion of direct 
emissions and significant indirect emissions such as significant 
emissions from land-use changes in section 211(o)(1)(H) of the CAA 
requires a consequential approach to considering the real-world 
emissions associated with biofuel production. A ``consequential'' 
approach considers the real-world greenhouse gas emissions associated 
with biofuel production, including secondary or indirect emissions 
resulting from market interactions induced by expanded biofuel 
production and use. Such an approach includes consideration of market 
interactions induced by expanded biofuel production and use that may 
result in secondary or indirect greenhouse gas emissions, domestically 
and globally.
    Proposed Sec.  1.45Y-5(d) would provide the rules applicable to 
determining a net rate of GHG emissions for C&G Facilities, including 
by the Secretary when publishing a table described in section 
45Y(b)(2)(C)(i) or determining an emissions rate as provided in section 
45Y(b)(2)(C)(ii). Proposed Sec.  1.45Y-5(d)(1) would provide that GHG 
emissions rates for C&G Facilities must be determined by a lifecycle 
analysis (LCA) that complies with proposed Sec.  1.45Y-5(d) and (e), 
and that such rate equals the net rate of greenhouse gases emitted into 
the atmosphere by such facility (taking into account lifecycle 
greenhouse gas emissions, as described in section 211(o)(1)(H) of the 
CAA) in the production of electricity, expressed as grams of 
CO<INF>2</INF>e per kWh.
    Proposed Sec.  1.45Y-5(d)(2) would provide that an LCA used for 
determining the net rate of greenhouse gases emitted into the 
atmosphere by a facility must comply with the requirements provided in 
proposed Sec.  1.45Y-5(d)(2)(i) through (vii). Proposed Sec.  1.45Y-
5(d)(2)(i) would provide that the starting boundary of the LCA for an 
LCA involving generation-derived feedstocks (such as biogenic 
feedstocks) is feedstock generation, and the starting boundary of the 
LCA for an LCA involving extraction-derived feedstocks (such as fossil 
fuel feedstocks) is feedstock extraction. Under proposed Sec.  1.45Y-
5(d)(2)(i), the starting boundaries would include the processes 
necessary to produce and collect or extract the raw materials used to 
produce electricity from combustion or gasification technologies, 
including those used as energy inputs to electricity production. This 
includes the emissions effects of relevant land management activities 
or changes related to or associated with feedstock production. The 
starting conditions are the material and energy flows, including 
associated direct and indirect greenhouse gas emissions, of the 
processes associated with the extraction or production of raw feedstock 
materials or fuel.
    Proposed Sec.  1.45Y-5(d)(2)(ii) would provide that the ending 
boundary of an LCA for electricity that is transmitted to the grid or 
electricity that is used on-site is the meter at the point of 
production of the C&G Facility. The distribution, transmission, and use 
of such electricity generated by a C&G Facility (and other types of 
energy sources it may displace while in use) are outside of the LCA 
boundary; therefore, such emissions would not be taken into account 
because they do not occur in the ``production of electricity'' as 
described in section 45Y(b)(2)(B). Given the particular context of 
section 45Y(b)(2)(B) (that is, a tax credit for the production of clean 
electricity), proposed Sec.  1.45Y-5(d)(2)(ii) is consistent with 
section 45Y(b)(2)(B) of the Code (and the term ``ultimate consumer'' in 
section 211(o)(1)(H) of the CAA referenced therein) because it would 
treat the C&G Facility as the ultimate consumer of the fuel used to 
produce electricity.
    Proposed Sec.  1.45Y-5(d)(2)(iii) would provide that an LCA must be 
based on a future anticipated baseline, which projects future status 
quo in the absence of the availability of the sections 45Y and 48E 
credits (taking into account anticipated changes in technology, 
policies, practices, and environmental and other socioeconomic 
conditions).
    Proposed Sec.  1.45Y-5(d)(2)(iv) would provide that offsets and 
offsetting activities that are unrelated to the production of 
electricity by a C&G Facility, including the production and 
distribution of any input fuel, may not be taken into account in an 
LCA.
    Proposed Sec.  1.45Y-5(d)(2)(v) would interpret the reference to 
section 211(o)(1)(H) of the CAA as requiring that an LCA must take into 
account direct emissions, significant indirect emissions in the United 
States or other countries, emissions associated with market-mediated 
changes in related commodity markets, emissions associated with 
feedstock generation or extraction, emissions consequences of increased 
production of feedstocks, emissions at all stages of fuel and feedstock 
production and distribution, and emissions associated with 
distribution, delivery, and use of feedstocks to and by a C&G Facility. 
Proposed Sec.  1.45Y-5(d)(2)(v) would interpret section 45Y(b)(2)(B) of 
the Code (and the term ``ultimate consumer'' in section 211(o)(1)(H) of 
the CAA referenced therein) as applying to the C&G Facility because it 
is the

[[Page 47804]]

ultimate consumer of the fuel used to produce electricity.
    Proposed Sec.  1.45Y-5(d)(2)(v)(A) would provide that direct 
emissions include, but are not limited to: (1) emissions from feedstock 
generation, production, and extraction (including emissions from 
feedstock and fuel harvesting and extraction and direct land use change 
and management, including emissions from fertilizers, and changes in 
carbon stocks); (2) emissions from feedstock and fuel transport 
(including emissions from transporting the raw or processed feedstock 
to the fuel processing facility); (3) emissions from transporting and 
distributing fuels to the electricity production facility; (4) 
emissions from handling, processing, upgrading, and/or storing 
feedstocks, fuels and intermediate products (including emissions from 
on/offsite storage and preparation/pre-treatment for use (for example, 
torrefaction or pelletization) and emissions from process additives); 
and (5) emissions from combustion and gasification at the electricity 
generating facility (including emissions from the combustion and/or 
gasification process and emissions from gasification or combustion 
additives). Proposed Sec.  1.45Y-5(d)(2)(v)(B) would provide examples 
of significant indirect emissions including, but not limited to, 
emissions from indirect land use and land use change and other induced 
emissions associated with the increased use of the feedstock for 
electricity production. Significant indirect emissions may include 
positive or negative emissions. For biogenic resources, significant 
indirect emissions may include emissions from growth and regrowth.
    Proposed Sec.  1.45Y-5(d)(2)(vi) would provide principles for 
excluded emissions by listing types of emissions that the LCA must not 
take into account.
    Proposed Sec.  1.45Y-5(d)(2)(vii) would provide that an LCA may 
consider alternative fates and may account for avoided emissions. 
Alternative fate means a set of informed assumptions (for example, 
production processes, material outcomes, market-mediated effects) used 
to estimate the emissions from the use of each feedstock were it not 
for the feedstock's new use due to the implementation of policy (that 
is, to produce electricity). Avoided emissions means the estimated 
emissions associated with the feedstock, including the feedstock's 
production and use, that would have occurred in the alternative fate 
(if such feedstock had not been diverted for electricity production) 
but are instead avoided with the feedstock's use for electricity 
production. It is important to note that, while, in some circumstances, 
emissions may be avoided if compared to the alternative fate, in others 
the new use of the material (for example, for electricity production) 
may involve additional emissions that were not emitted in the 
alternative fate estimation. Relatedly, in some circumstances, 
emissions may be avoided in one part of the supply chain only to occur 
elsewhere along the supply chain due to the new use.
4. Additional Issues Regarding Greenhouse Gas Emissions Rates for C&G 
Facilities
    The determination of net GHG emissions rates for C&G Facilities 
raises a range of complex technical questions that are relevant to 
determining eligibility for the section 45Y and section 48E credits. 
The Treasury Department and the IRS request comment on the following 
topics: (1) the treatment of renewable natural gas (RNG) and fugitive 
sources of methane; (2) analytical LCA parameters, including spatial 
scales and time horizons; (3) whether and how to distinguish between 
co-products, byproducts, and waste products and how emissions should be 
allocated to each in LCAs; (4) how to attribute emissions to the heat 
produced by facilities using combined heat and power systems; (5) how 
to create and maintain LCA baselines; and (6) certain issues related to 
LCA modeling.
a. Treatment of Biogas, Renewable Natural Gas (RNG), or Fugitive 
Sources of Methane
    The Treasury Department and the IRS intend to provide rules 
addressing facilities that produce electricity using biogas, renewable 
natural gas (RNG), or fugitive sources of methane (for example, from 
coal mine operations) for purposes of the section 45Y credit or the 
section 48E credit, collectively referred to as the ``Clean Electricity 
Tax Credits.'' In the context of this guidance, the term ``RNG'' refers 
to biogas that has been upgraded to be equivalent in nature to fossil 
natural gas. Fugitive methane refers to the release of methane through, 
for example, equipment leaks during the extraction, processing, 
transformation, and delivery of fossil fuels to the point of final use, 
such as coal mine methane. Such rules would apply to all biogas, RNG, 
or fugitive methane used for the purposes of the Clean Electricity Tax 
Credits and would provide requirements that must be met to account for 
any greenhouse gas emissions benefits from biogas, RNG, or fugitive 
methane in determining GHG emissions rates for purposes of the Clean 
Electricity Tax Credits. Such requirements would be designed to reflect 
the ways in which additional demand for biogas, RNG or fugitive methane 
can impact greenhouse gas emissions outcomes.
    The Treasury Department and the IRS anticipate requiring that for 
purposes of the Clean Electricity Tax Credits, in order for biogas, 
biogas-based RNG, or fugitive methane to receive an emissions value 
consistent with such gases (and not standard natural gas), the biogas 
or RNG used to produce electricity or to produce a feedstock or fuel 
that is used to produce electricity must originate from the first 
productive use of the relevant methane. For any specific source of 
biogas, RNG, or fugitive methane, productive use is generally defined 
as any valuable application of the relevant methane (including to 
provide heat or cooling, generate electricity, or upgraded to RNG in 
the case of biogas or fugitive methane), and specifically excludes 
venting to the atmosphere or capture and flaring. The Treasury 
Department and the IRS further propose to define first productive use 
of the relevant methane as the time when a producer of that gas first 
begins using or selling it for productive use in the same taxable year 
as (or after) the electricity production facility was placed in 
service. The implication of this proposal is that biogas, for example, 
from any source that had been productively used in a taxable year prior 
to the taxable year in which the relevant electricity production 
facility was placed in service would not include GHG emissions benefits 
that might otherwise be attributable to biogas-based RNG, but would 
instead receive a value consistent with natural gas. This proposal 
would limit emissions associated with the diversion of biogas, RNG, or 
fugitive methane from other pre-existing productive uses.
    For existing biogas sources that typically productively use or sell 
a portion of the biogas and flare or vent the remaining excess, the 
flared or vented portion may be eligible for first productive use as 
defined above if the flaring or venting volume can be adequately 
demonstrated and verified. In such circumstances, the flared or vented 
volume may be determined based on the previous taxable year's flared or 
vented volume as demonstrated via reported data to programs such as the 
Greenhouse Gas Reporting Program. Requirements would be established to 
reduce the risk that entities will deliberately generate additional 
biogas for purposes of the Clean Electricity Tax Credits, above 
historic and expected future levels or an equivalent metric, for 
example by

[[Page 47805]]

generating biogas through the intentional generation of waste, and to 
ensure that other factors affecting the emissions rate of electricity 
produced with biogas, biogas-based RNG or RNG procurement via RNG 
certificates are taken into account. The Treasury Department and the 
IRS request comment on these and other potential conditions. Any 
fugitive sources of methane would be treated in the same fashion as 
biogas or RNG with respect to these requirements, albeit with different 
considerations in development of the counterfactual.
    The Treasury Department and the IRS also recognize that different 
sources of methane may have significantly different characteristics 
(for example, counterfactuals, alternative fates, baseline 
characteristics, upstream leakage rates, etc.) and therefore 
significantly different lifecycle emissions. For this reason, the 
Treasury Department and the IRS are considering requiring an LCA to be 
conducted for electricity produced by each category of feedstock, 
rather than across all feedstocks used for the production of 
electricity by a facility. The Treasury Department and the IRS request 
comment on whether LCAs should be conducted on a feedstock-by-feedstock 
basis or averaged across feedstocks, and how to determine the 
appropriate categories of feedstock.
    For purposes of the Clean Electricity Tax Credits, producers using 
biogas, RNG, or fugitive methane would be required to acquire and 
retire corresponding energy attribute certificates (EACs) through a 
book-and-claim system that can verify in an electronic tracking system 
that all applicable requirements are met.
    Electricity producers would also be required to have a pipeline 
interconnection and measurement capability using a revenue grade meter. 
These rules would apply to the use of EACs with both direct and non-
direct claims of biogas, RNG, or fugitive methane use. Direct use would 
involve a direct exclusive pipeline connection to a facility that 
generates biogas or RNG or from which fugitive methane is being 
sourced, while non-direct use would involve production using biogas, 
RNG, or fugitive methane sourced from a commercial or common-carrier 
natural gas or other specified pipeline. In all cases, EACs would need 
to document the biogas, RNG, or fugitive methane procurement use claims 
and that the energy attributes of the RNG or fugitive methane being 
used are not sold to other parties or used for compliance with other 
policies or programs.
    The Treasury Department and the IRS request comments on these and 
other approaches related to biogas, RNG and fugitive methane. Regarding 
these sources of methane, the Treasury Department and the IRS request 
comment on the appropriate LCA considerations associated with them, 
such as counterfactual scenarios (that is, appropriate baselines), to 
account for direct and significant indirect emissions, and also the 
manner in which to assess methane from these sources if the current 
practice is flaring. In particular, the Treasury Department and the IRS 
request comments on the following questions:
    (1) What data sources and peer reviewed studies provide information 
on fugitive methane, biogas, and RNG production systems (including 
biogas production and reforming systems), markets, monitoring, 
reporting, and verification processes, and greenhouse gas emissions 
associated with these production systems and markets?
    (2) What conditions for the use of biogas, RNG, and fugitive 
methane would ensure that emissions accounting for purposes of the 
Clean Electricity Tax Credits reflect and reduce the risk of indirect 
emissions effects from electricity production using biogas and RNG? How 
can taxpayers verify that they have met these requirements?
    (3) How broadly available and reliable are existing electronic 
tracking systems and verification protocols and practices for biogas, 
RNG, or fugitive methane certificates in book and claim systems? What 
developments may be required, if any, before such systems are 
appropriate for use with biogas or RNG certificates used to claim the 
Clean Electricity Tax Credits?
    (4) How should biogas, RNG or fugitive methane resulting from the 
first productive use of methane be defined, documented, and verified? 
What industry best practices or alternative methods would enable such 
verification to be reflected in a biogas, RNG or methane certificate or 
other documentation? What additional information should be included in 
such EACs to help certify compliance?
    (5) What are the emissions associated with different methods of 
transporting biogas, RNG or fugitive methane to electricity producers 
(for example, vehicular transport, pipeline)?
    (6) How can the final regulations reflect and mitigate indirect 
emissions effects from the diversion of biogas, RNG, or fugitive 
methane from potential future productive uses? What other new uses of 
biogas, RNG, or fugitive methane could be affected in the future if 
more gas from new capture and productive use of methane from these 
sources is used in the electricity production process?
    (7) How can the potential for the generation of additional 
emissions from the production of additional waste, waste diversion from 
lower-emitting disposal methods, and changes in waste management 
practices be limited through emissions accounting or rules for biogas 
and RNG use established for purposes of the Clean Electricity Tax 
Credits?
    (8) To limit the additional production of waste, should the final 
regulations limit eligibility to methane sources that existed as of a 
certain date or waste or waste streams that were produced before a 
certain date, such as the date that the IRA was enacted? If so, how can 
that be documented or verified? How should any changes in volumes of 
waste and waste capacity at existing methane sources be documented and 
treated for purposes of the Clean Electricity Tax Credits? How should 
additional capture of existing waste or waste streams be documented and 
treated?
    (9) Are geographic or temporal deliverability requirements needed 
to reflect and reduce the risk of indirect emissions effects from 
biogas, RNG, or fugitive methane use in the electricity production 
process? If so, what should these requirements be and are electronic 
tracking systems able to capture these details?
    (10) How should variation in methane leakage across the existing 
natural gas pipeline system be taken into account in estimating the 
emissions from the transportation of RNG or fugitive methane or 
establishing rules for RNG or fugitive methane use? How should methane 
leakage rates be estimated based on factors such as the location where 
RNG or fugitive methane is injected and withdrawn, the distance between 
the locations where RNG or fugitive methane is injected and withdrawn, 
season of year, age of pipelines, or other factors? Are data or 
analysis available to support this?
    (11) What counterfactual assumptions and data should be used to 
assess the net greenhouse gas emissions of facilities that rely on 
biogas, RNG, or fugitive methane (for example, venting, flaring, or 
other practice)? Is venting an appropriate counterfactual assumption in 
some cases? If not, what other factors should be considered?
    (12) What criteria should be used in assessing biogas, fugitive 
methane, or RNG-based provisional emissions rates? What practices 
should be put in place to reduce the risk of unintended consequences 
(for example, gaming)? Should conservative default parameters

[[Page 47806]]

and counterfactuals be used unless proven otherwise by a third party?
    (13) What are the effects on greenhouse gas emissions of capturing 
methane emissions for use as biogas or RNG, such as on livestock farms?
    The Treasury Department and the IRS recognize that sufficient 
tracking and verification mechanisms for biogas, RNG, or fugitive 
methane are not yet available, and existing systems have limited 
capabilities for tracking and verifying RNG pathways, especially in the 
part of the production process before the methane has been reformed to 
RNG. Existing tracking and verification systems do not clearly 
distinguish between inputs, verify or require verification of 
underlying practices claimed by biogas or RNG production sources, 
require proof of generator interconnection or revenue-quality metering, 
provide validation of generation methodology, include exclusively 
United States based-generation, verify generator registration, and 
track the vintage of generator interconnection. The Treasury Department 
and the IRS are considering providing rules to address whether or how 
book-and-claim systems with sufficient tracking and verification 
mechanisms may be used to attribute the environmental benefits of 
biogas, RNG, or fugitive methane in the final regulations.
    The treatment of biogas, RNG, and fugitive methane presents a range 
of complex issues that the Treasury Department and the IRS will 
consider in the development of the final regulations.
b. Analytical LCA Parameters, Including Spatial Scales and Time 
Horizons
    An LCA may require decisions on a wide range of analytical 
parameters that may have a meaningful impact on the accuracy and 
utility of its results. The Treasury Department and the IRS request 
comment on the analytical LCA parameters that are most relevant to 
particular types of categories of facilities that may be eligible for 
the Clean Electricity Tax Credits.
    The Treasury Department and the IRS specifically request comment 
regarding spatial and temporal scales, including the factors that 
should be considered in setting the spatial and temporal scales for 
LCAs conducted for the Clean Electricity Tax Credits. Spatial scale 
involves defining the area over which emissions impacts will be 
evaluated. Temporal scale involves defining the time period over which 
emissions impacts will be evaluated. The decision of setting the 
spatial scale should be considered in conjunction with decisions on 
temporal scale, as the two can interact in ways that affect greenhouse 
gas assessment outcomes.
    In conducting a greenhouse gas assessment for biomass feedstocks, 
for example, carbon stocks or flows that have high variability at fine 
spatial or temporal scales may have much less variability if averaged 
over larger areas or longer temporal scales. Averaging over long 
temporal scales may reduce the variability observed at small spatial 
scales, and averaging over large areas may reduce the variability 
observed over small temporal scales. However, it is not safe to assume 
that integrating over large areas and long timeframes is always 
preferable. Large spatial scales and long temporal scales are not 
necessarily the most accurate way to conduct specific policy or program 
assessments because the combination of the two may obscure important 
information (for example, biophysical differences in species or 
landscapes, or shorter time frames or subregional analysis needed for 
policy analysis) or may mask important smaller-scale impacts. It is 
important to note that utilizing a large spatial scale and a short 
temporal scale could yield the same result as a small spatial scale 
combined with a longer temporal scale.
    The Treasury Department and the IRS acknowledge that it may be 
appropriate to utilize different spatial and temporals scales for 
different feedstocks given their heterogeneity. The Treasury Department 
and the IRS request comment on the following questions regarding 
spatial and temporal scale:
    (1) What factors should be considered in establishing the timeframe 
for the LCA analysis? What timeframe would provide confidence that 
significant emissions have been accounted for?
    (2) Should the LCA distinguish between an ``emissions horizon'' 
(the timeframe over which emissions effects from the feedstock use 
persist into the future) and an ``assessment horizon'' (the timeframe 
over which the emissions effects are included in the analysis), and how 
would that be reflected in the choice of temporal scale? What 
assessment horizon will provide reasonable confidence that significant 
LCA emissions have been incorporated? Should the modeled future 
anticipated baseline include estimated emissions from electricity 
production to reflect the effects of the anticipated phase out of the 
Clean Electricity Tax Credits?
    (3) If the assessment horizon is shorter than the emissions 
horizon, should an estimate of the emissions beyond the assessment 
horizon be included in the LCA?
    (4) What considerations should be reflected in the choice(s) of 
spatial scale? For example, the increased use of some fuels/feedstocks 
may have global effects (for example, changes in commodity production 
and ensuing land use and greenhouse gas changes), though this may not 
be the case for all feedstocks or fuels. What factors should be 
considered to assess whether a global scale is necessary for certain 
feedstocks to ensure that significant emissions are captured? Should 
all feedstock/fuels assessments be conducted with the same spatial 
scale to determine the extent to which increased use has estimated 
global ramifications?
    (5) The choice of spatial scale can be greatly influenced by the 
availability and accuracy of data and the precision with which one can 
measure and model feedstock production as well as market dynamics. What 
sources of data would be most important to consider for modeling? What 
strengths or weaknesses do these sources have?
c. Distinguish Between Co-Products, Byproducts, and Waste Products and 
How Emissions Should Be Allocated to Each in LCAs
    The categorization and assessment of products as co-products, 
byproducts, or waste products in an LCA may affect the LCA's results. 
Products, co-products, byproducts, and wastes may all be produced in 
the full fuel cycle or used as inputs to the same. A co-product is a 
product produced together with another product, both of which are 
economic drivers of the process. A byproduct is a product that is 
produced together with another product, and which has a productive use 
but is not the primary economic driver of the process from which it is 
produced. It is not solely or separately produced. A waste product is a 
substance or object that the holder intends or is required to dispose 
of. See ISO:14040, ``Environmental management--Life cycle assessment--
Principles and framework. For biogenic sources, scientific literature 
often classifies byproducts, wastes, and residues together in one 
category.
    The categorization of products as co-products, byproducts, and 
waste products may be relevant to an LCA's assessment of the greenhouse 
gas emissions related to the production of inputs to electricity 
generation or in the generation of electricity itself if the LCA 
modeling approach or approaches used for purposes of the Clean 
Electricity Tax Credits have the ability to distinguish between such 
categories. For example, in certain circumstances, the use of a waste 
product as a feedstock or fuel for

[[Page 47807]]

electricity production may generate more, less, or the same greenhouse 
gas emissions than relevant disposal practices for that waste material. 
The emissions released in the production process during which a waste 
product is created could be fully allocated to the main product, co-
products, and byproducts of that process meaning that the emissions 
associated with the production of the waste could be considered zero in 
the LCA assessment pending further analysis, potentially reducing the 
overall LCA GHG emissions rates for the electricity production. 
Alternatively, if the waste product were considered to have a 
productive use and therefore instead categorized as a co-product it 
would be considered as a driver of the production process and could 
have a positive emissions value. A material may initially have no 
economic value or useful purpose, but if that material later gains an 
economic value, its categorization may shift to a byproduct or co-
product.
    The Treasury Department and the IRS intend to clarify the 
principles for categorizing products as co-products, byproducts, or 
waste input materials and products and assessing the emissions impacts 
for such products in an LCA for C&G Facilities in the final regulations 
for the Clean Electricity Tax Credits if such categorization is 
relevant to the LCA model or models used. Under such principles, if 
byproducts are produced concurrently with electricity production, then 
a portion of the process emissions may be allocated to those 
byproducts. If applying an analytical approach that considers the 
consequences of the material being used for electricity production and 
byproducts are produced concurrent with electricity production, the LCA 
may consider the market impacts associated with the byproducts. In 
addition, if wastes are produced concurrently with electricity 
production, then no process emissions may be allocated to those wastes; 
all emissions must be associated with the electricity produced. Whether 
alternative productive uses of a byproduct-derived feedstock exist 
would be determined by expert analysis of the likely alternative uses 
of the byproduct, taking into account technological and economic 
capabilities and common practice. The alternative fate of waste-derived 
feedstocks would be determined by expert analysis, literature review, 
and historical practice.
    To inform the development of these categorization principles for 
the final regulations, the Treasury Department and the IRS request 
comment on the following:
    (1) What principles should be used to distinguish between co-
products, byproducts, and waste products for the purposes of the Clean 
Electricity Tax Credits? Are there common scientific or industry 
definitions that can be relied upon to distinguish between co-products, 
byproducts, and waste products?
    (2) What principles should be used to determine whether a product 
has sufficient value to be considered a co-product or byproduct?
    (3) The Clean Electricity Tax Credits may provide additional 
economic incentive for the consumption of a product categorized as 
waste prior to the availability of the incentive provided by the Clean 
Electricity Tax Credits. How should this additional economic incentive 
be considered to determine if a product is a waste product, byproduct, 
or co-product? Should this categorization be reevaluated and, if so, 
how often?
    (4) To limit the additional production of waste, should the final 
regulations limit eligible waste sources that existed as of a certain 
date, or waste or waste streams that were produced before a certain 
date, such as the date that the IRA was enacted? If so, how could that 
be documented or verified? How should any changes in volumes of waste 
and waste capacity at existing sources be documented and treated for 
purposes of the Clean Electricity Tax Credits? How should additional 
capture of existing waste or waste streams be documented and treated?
    (5) More generally, how could the potential for the intentional 
generation of waste or co-products for the purposes of lowering the 
allocated process emissions to electricity be addressed?
    (6) Would the classification of feedstocks as products, co-
products, byproducts, or waste change depending on the technology? For 
example, would products, co-products, byproducts, and waste be 
described and accounted for differently if derived from biogenic 
sources, such as biogenic biomass?
d. Attributing Emissions to the Heat Produced by Facilities Using CHP 
Property
    Section 45Y(g)(2)(A) provides that the kWh of electricity produced 
by a taxpayer at a qualified facility includes any production in the 
form of useful thermal energy by any CHP property within such facility, 
and the amount of greenhouse gases emitted into the atmosphere by such 
facility in the production of such useful thermal energy will be 
included for purposes of determining the GHG emissions rate for such 
facility. See Explanation of Provisions section I.A. for the definition 
of CHP property. The inclusion of thermal energy production-related 
emissions in an LCA for a CHP facility introduces additional 
considerations, such as how to set an appropriate baseline for useful 
energy production-related emissions and what rules should govern the 
attribution of emissions for thermal energy production. The Treasury 
Department and the IRS intend to clarify the principles for assessing 
the emissions related to the generation of useful thermal energy by a 
CHP facility in an LCA in the final regulations for the Clean 
Electricity Tax Credits. Accordingly, the Treasury Department and the 
IRS request comment on the following:
    (1) To determine the amount of greenhouse gases emitted by a CHP 
facility, the LCA must include the greenhouse gas emissions emitted by 
that facility in the production of useful thermal energy. For purposes 
of the LCA of a CHP facility, what principles should govern how 
emissions from the production of useful thermal energy are calculated?
    (2) What principles should be used to determine the baseline for 
useful thermal energy production by a CHP facility? For example, should 
the baseline for the heat production for a CHP facility be an 
alternative form of thermal energy production such as natural gas 
boilers, such that emissions from the production of thermal energy from 
the boilers would be subtracted from the facility's emissions? 
Alternatively, is it more appropriate if the baseline for a CHP 
facility is no thermal energy production by the facility?
    (3) There may be scenarios in which a facility generates 
electricity that is used (a) by the electricity generation facility in 
the production of electricity or (b) in the production of fuel 
ultimately consumed by that facility to generate electricity. For 
example, a wastewater treatment plant's post-processing materials are 
digested to produce biogas; this biogas is then used in a CHP facility 
that produces electricity; this electricity is consumed by the 
wastewater treatment facility. In such scenarios, what principles 
should be used to determine how emissions from the consumption of 
electricity in the production of electricity or in the production of 
the fuel consumed by the facility are calculated? Similarly, there may 
be scenarios in which a facility self-consumes thermal energy that it 
produces, for example, if a facility generates steam as a byproduct 
that is

[[Page 47808]]

used (a) by the facility to turn a turbine that generates electricity 
or (b) to clean or compress fuel ultimately consumed by that facility 
to generate electricity. What principles should be used be used to 
determine emissions from the self-consumption of thermal energy by the 
CHP facility?
e. Certain Issues Related to LCA Baselines and Modeling
    The Treasury Department and the IRS intend to provide additional 
rules and principles addressing what factors must be considered to 
assess the emissions associated with feedstocks used by C&G Facilities 
to produce electricity for purposes of the Clean Electricity Tax 
Credits.
    Such rules would apply to all feedstocks used for the purposes of 
the Clean Electricity Tax Credits and would provide conditions that 
must be met in determining GHG emissions rates for purposes of the 
Clean Electricity Tax Credits. The CAA explicitly defines the term 
``lifecycle greenhouse gas emissions'' to include ``the aggregate 
quantity of greenhouse gas emissions (including direct emissions and 
significant indirect emissions such as significant emissions from land 
use changes).'' Given the highly interconnected economic, energy, and 
agricultural and other lands-based systems involved in electricity 
production, the Treasury Department and the IRS recognize that 
electricity production may have effects, including emissions effects, 
beyond the direct supply chain. The Treasury Department and the IRS 
think that the provision ``including direct emissions and significant 
indirect emissions'' requires any LCA for the Clean Electricity Tax 
Credits to adopt an approach that considers the consequential, or 
market-mediated, impacts of increased demand for the input feedstocks 
or fuels used in electricity production.
    The EPA interpreted CAA 211(o)(1)(H) as requiring the agency in the 
RFS context to account for the real-world emissions consequences of 
increased production of biofuels. Thus, the EPA determined that CAA 
section 211(o)(1)(H)'s inclusion of ``direct emissions and significant 
indirect emissions such as significant emissions from land-use 
changes'' requires a ``consequential'' approach to considering the 
real-world emissions associated with biofuel production. Such an 
approach includes consideration of market interactions induced by 
expanded biofuel production and use that may result in secondary or 
indirect greenhouse gas emissions.
    The Treasury Department and the IRS propose to use a future 
anticipated baseline approach for analyzing the greenhouse gas 
emissions associated with the production of electricity by C&G 
Facilities and feedstocks used by such facilities. This approach would 
require generating a baseline projection of the future, which reflects 
estimated future conditions under a business-as-usual (BAU) trajectory 
that incorporates key drivers and trends informed by historical data 
and other considerations. This baseline would then serve as the 
``reference'' against which another scenario in which specific 
conditions or changes, such as implementation of the policy embodied by 
the Clean Electricity Tax Credits, can be projected. This construct 
would allow for the evaluation of the projected estimated change or 
difference of emissions outcomes between the two scenarios. These 
scenarios would include (1) the baseline scenario (that is, without the 
Clean Electricity Tax Credits) and (2) a policy scenario (that is, with 
the Clean Electricity Tax Credits).
    These scenarios would require, to the extent possible, data on: (1) 
feedstock or fuel production systems (including fuel/feedstock 
generation or extraction, etc.); (2) associated greenhouse gas 
emissions and, if applicable, carbon pool fluxes; (3) the feedstock or 
fuel's sector details; (4) feedstock or fuel demand and prices; (5) 
energy market projections, including electricity demand and supply and 
prices, if applicable; (6) future macroeconomic factors (for example, 
EIA Annual Energy Outlook-derived population growth, gross domestic 
product projections, demand functions tied to population or income); 
(7) technological progress assumptions, especially if applicable to 
stationary sources for which efficiency improvements are possible and 
anticipated; and (8) other parameters (for example, representation of 
current and anticipated, energy, environmental, or other policies 
including expected outcomes from other parts of the IRA or other 
policies, if relevant, that can inform or constrain BAU trajectories).
    For example, the list that follows identifies proposed key modeling 
approach elements and considerations for simulation of a future 
anticipated baseline and policy scenarios specific to biomass-based 
feedstocks: (1) model function types and model dynamics (for example, 
economic optimization, intertemporal and/or recursive dynamic); (2) 
anticipated future conditions (for example, macroeconomic, biophysical, 
chemical); (3) greenhouse gas emissions representation, by including 
the different greenhouse gases and the relevant greenhouse gas 
emissions and sequestration sources (for example, how greenhouse gases 
and their effects on the environment are incorporated and represented, 
such as what emissions sources and factors are reflected in the model 
or models); (4) forest sector representation (for example, how are 
forestry and forest industries reflected in the model and how are they 
tied to the rest of the economy); (5) agricultural sector 
representation; (6) land use competition; (7) energy sector 
representation; and (8) the appropriate spatial scale (for example, 
international representation) for all of these considerations.
    There may be different ways to model or estimate greenhouse gas 
emissions associated with the production of electricity by a C&G 
Facility. Consistent with the parameters in proposed Sec.  1.45Y-5(d), 
the Treasury Department and the IRS seek comment on general principles 
and factors to be considered to estimate net greenhouse gas emissions 
associated with electricity production by C&G Facilities, including the 
selection or creation of an assessment or modeling approach for the 
purposes of Clean Electricity Tax Credits. Comment is specifically 
requested on the following topics:
    (1) What factors should be considered in deciding how to create and 
maintain LCA baseline scenarios?
    (2) What factors should be considered in deciding how to create and 
maintain LCA scenarios other than the baseline?
    (3) What existing model or suite of models are capable of 
completing an LCA consistent with the section 45Y(b)(2)(B) and proposed 
Sec.  1.45Y-5(d) and (e)? Please explain whether any such model or 
models are open source or proprietary including what type of 
documentation is publicly available detailing the model design, data, 
inputs, and assumptions, as well as whether such models are able to 
link with external data sources or models. Please also explain which 
entities own, manage, or update such models. Furthermore, because some 
LCA models may be used for only a certain aspect of the total required 
analysis (for example, a model may solely assess the agriculture 
sector) or only include certain feedstocks or technologies, please 
specify what technologies, feedstocks, or type of impacts are included 
or are not included in the recommended model or models. Please also 
explain how widely and for what purposes the recommended model or 
models are used, including whether the model has previously been used 
by a Federal or State agency or national

[[Page 47809]]

laboratory. Please explain whether and how the model has been peer-
reviewed. Finally, please explain whether the recommended model or 
models would need to be updated or combined with another model in order 
to be fully consistent with section 45Y(b)(2)(B) and proposed Sec.  
1.45Y-5(d) and (e).
    (4) What data sources and peer-reviewed studies provide information 
on different feedstock production systems that would be most important 
to consider for gathering data for LCA modeling? These sources and 
studies should provide information on the feedstock production process 
(ideally, beginning with the extraction or generation of the feedstock 
and ending at the electrical meter) and on markets related to the 
feedstock production process. Appropriate sources and studies should 
also describe the greenhouse gas emissions associated with these 
production systems and markets, as well as any monitoring, reporting, 
and verification processes used in the creation of the source or study. 
If recommending data sources or peer-reviewed studies, please specify 
whether they are open source or proprietary; their temporal and spatial 
scale (for example, regional versus national studies); whether they are 
regularly updated and with what frequency; whether they are collected 
by a Federal or State agency or statistical agency or national 
laboratory; and whether they employ direct measurements or modeling or 
use remote sensing data. Finally, please assess overall the strengths 
and weaknesses of the recommended sources or studies with respect to 
their usefulness as modeling data inputs.
    (5) The availability of the Clean Electricity Tax Credits may 
create an incentive to use a given material differently than in the 
past (for example, a material that was not typically used for 
electricity production is initially used or used more broadly after the 
credits are available). How could an LCA or LCAs establish and account 
for whether the incentives created by the Clean Electricity Tax Credits 
have resulted in a reduction, removal of, or increase in greenhouse gas 
emissions beyond the emissions that would have occurred in the absence 
of the Clean Electricity Tax Credits? For example, consider a scenario 
in which, in the absence of the incentive provided by the Clean 
Electricity Tax Credits, an amount of woody biomass would be either 
left standing or laying in a forest, pile burned, or used to create 
timber products, such as charcoal or mulch, each an ``alternative 
fate.'' In the presence of the Clean Electricity Tax Credits, that 
amount of woody biomass is now being used to generate electricity. How 
should the possible fates of the feedstock in the absence of the Clean 
Electricity Tax Credits (for example, left in standing or laying in a 
forest, pile burned, or used to create a timber product, such as 
charcoal or mulch) be represented in an LCA, including the different 
potential direct and indirect greenhouse gas effects of those fates?
    (6) How could an LCA account for alternative fates stemming from 
events such as potential future greenhouse gas emissions from wildfires 
that could be associated with woody biomass feedstocks that may be left 
on the landscape in the absence of the incentive created by the Clean 
Electricity Tax Credits? How would these considerations be affected if, 
in the absence of the incentive provided by the Clean Electricity Tax 
Credits, a feedstock is used productively but not in electricity 
production?
    (7) Which feedstock classification categories should be established 
for purposes of LCA analyses, if any? To what extent should the LCA or 
LCAs differentiate between the sources and subtypes of a given 
feedstock for electricity production or not (for example, all forest-
derived materials as one category, or subcategories such as logging 
residues)? If applied, should subcategories of feedstocks be aggregated 
in modeling, or should they be should they be separately modeled? How 
could the LCA or LCAs account for the emissions attributed to 
feedstocks that include a mixture of sub-types of feedstocks, such as 
products, coproducts, byproducts and residues? Should LCAs be 
standardized or provide average estimates for feedstocks and how could 
such standardization best be done?
    (8) What factors should be considered to determine the appropriate 
scale(s) of feedstock demand changes or other shocks to evaluate the 
extent to which the production, processing, and use of the feedstocks 
used for electricity production results in net greenhouse gas 
emissions?
    (9) Should the shock reflect a small incremental increase in use of 
the feedstock to reflect the marginal impact, or a large increase to 
reflect the average effect of all potential users?
    (10) What could the general increment of the shock be? Should it be 
specified as an absolute or relative increase?
    (11) What factors should be considered to determine whether shocks 
for different feedstocks should be implemented in isolation (separate 
model runs), in aggregate (for example, as an across-the-board increase 
in biomass usage endogenously allocated by the model across 
feedstocks), or something in between (for example, separately model 
agriculture-derived and forest-derived feedstocks, but endogenously 
allocate within each category)?
    (12) How should variation and uncertainty be considered in 
evaluating model estimates of the GHG emissions associated with an 
increase in the use of a feedstock for electricity generation? 
Feedstock modeling will likely involve uncertainties and variabilities 
associated with data, parameterization, scenario, and model choices. 
For example, if the modeling reports a range of GHG emissions changes 
that are greater and less than zero, how should such a range of 
outcomes be evaluated under section 45Y(b)(2)(B)?
f. Book and Claim Accounting
    The Treasury Department and the IRS are considering whether to 
allow and provide rules governing the use of book and claim accounting 
in the final regulations for the Clean Electricity Tax Credits. Under 
these proposed regulations, the methods used, and emissions associated 
with the production of fuels and feedstocks used in the generation of 
electricity are essential to determining whether a facility is a C&G 
Facility and assessing its GHG emissions rate. See Explanation of 
Provisions sections I.D.1 and I.D.3 for discussion of tracking fuel or 
feedstock production to determine whether a facility is a C&G Facility 
or Non-C&G Facility. EACs are a form of book-and-claim accounting that 
conveys information about the attributes associated with a unit of 
energy, including the fuel or feedstock used to create the energy. EACs 
may also include information about the location of the facility that 
generated the unit of energy, when that facility began operations, and 
when the unit of energy was produced. Because EACs can serve as a 
system for tracking the attributes associated with the production of a 
unit of energy and as a means to avoid double-counting, the Treasury 
Department and the IRS are considering whether to provide rules that 
address the use of book-and-claim systems as a means of verifying the 
emissions profile of a facility's use of fuel and electricity 
production. The Treasury Department and the IRS request comment on 
whether and how it may be appropriate for such systems to be used in 
determining GHG emissions rates in the final regulations for the Clean 
Electricity Tax Credits. In particular, comment is requested regarding 
what types of

[[Page 47810]]

energy inputs, including fuels and feedstocks, have or may develop 
sufficiently robust book-and-claim systems that may be suitable for use 
in substantiating and verifying claims of use of such energy inputs for 
purposes of the Clean Electricity Tax Credits. The Treasury Department 
and the IRS are considering providing rules that may permit the use of 
book and claim accounting in the final regulations if there are 
sufficient assurances that the energy attributes claimed under such 
system are verifiable and not susceptible to double counting.
5. Carbon Capture and Sequestration
    Proposed Sec.  1.45Y-5(e) would provide that, for purposes of 
proposed Sec.  1.45Y-5(c) and (d), the GHG emissions rate for a Non-C&G 
Facility or C&G Facility must exclude any qualified carbon dioxide in 
such facility's production of electricity that is captured by the 
taxpayer, and, pursuant to any regulations established under section 
45Q(f)(2), disposed of by the taxpayer in secure geological storage, or 
utilized by the taxpayer in a manner described in section 45Q(f)(5) and 
any regulations established under such section. The Treasury Department 
and the IRS request comment on the following:
    (1) What requirements should apply to substantiate and verify that 
carbon dioxide that is captured by the taxpayer is (a) disposed of by 
the taxpayer in secure geological storage pursuant to any regulations 
established under section 45Q(f)(2), disposed of by the taxpayer in 
secure geological storage, or (b) utilized by the taxpayer in a manner 
described in section 45Q(f)(5)? For example, would it be appropriate to 
limit the carbon dioxide that may be considered to be qualified carbon 
dioxide under section 45Y(e)(3), and thus excluded under section 
45Y(b)(2)(D), to carbon dioxide that has been reported to the U.S. 
Greenhouse Gas Reporting Program (GHGRP)? If so, which GHGRP subpart or 
subparts should be used?
    (2) In the event that carbon dioxide that was captured and 
sequestered as required by section 45Y(e)(3) subsequently escapes into 
the atmosphere after such carbon dioxide was taken into account by a 
taxpayer that claimed a Clean Electricity Tax Credit, what enforcement 
mechanisms or regulatory regimes should be used to identify when such 
emissions leakages have occurred? How should such emissions leakages be 
taken into account in determining compliance with the GHG emissions 
rate requirements under sections 45Y and 48E? Are the existing 
recapture provisions under section 45Q sufficient for this purpose?
    (3) Should carbon capture and sequestration that occurs in the 
production of fuel that is used by a facility to produce electricity be 
taken into account under proposed Sec.  1.45Y-5(e) and section 
45Y(e)(3)? If so, how should such use of carbon capture and 
sequestration (for example, emissions from CO<INF>2</INF> capture, 
purification and compression, transportation, and CO<INF>2</INF> site 
injection) be assessed in an LCA? Should emissions that occur from 
carbon capture and sequestration be taken into account in determining 
the net rate of greenhouse gases emitted into the atmosphere by a C&G 
Facility in the production of electricity? What verification and 
substantiation requirements would be appropriate to establish that 
carbon capture and sequestration that met the requirements of proposed 
Sec.  1.45Y-5(e) and section 45Y(e)(3) were met in the production of a 
fuel or feedstock? Are the existing recapture provisions under section 
45Q sufficient for this purpose?
6. Annual Table
    Proposed Sec.  1.45Y-5(f)(1) would provide that, as required by 
section 45Y(b)(2)(C)(i), the Secretary will annually publish a table 
that sets forth the GHG emissions rates for types or categories of 
facilities (Annual Table), which a taxpayer must use for purposes of 
section 45Y. Proposed Sec.  1.45Y-5(f)(1) would further provide that, 
except as provided in proposed Sec.  1.45Y-5(h), a taxpayer that owns a 
facility that is described in the Annual Table on the first day of the 
taxpayer's taxable year in which the section 45Y or section 48E credit 
is determined with respect to such facility must use the Annual Table 
as of such date to determine an emissions rate for such facility for 
such taxable year. Types or categories of facilities must be added or 
removed from the Annual Table consistent with, for Non-C&G Facilities, 
a technical assessment of the fundamental energy transformation into 
electricity as provided in proposed Sec.  1.45Y-5(c)(1)(ii), and, for 
C&G Facilities, an LCA that complies with proposed Sec.  1.45Y-5(d) and 
(e). Proposed Sec.  1.45Y-5(f)(2) would also provide that in connection 
with the publication of the Annual Table, the Secretary must publish an 
accompanying expert analysis that addresses any types or categories of 
facilities added or removed from the Annual Table since its last 
publication. Such analysis must be prepared by one or more of the 
National Laboratories, in consultation with other agency experts, such 
as experts from DOE, the Treasury Department, the United States 
Department of Agriculture (USDA), and the EPA, as appropriate, and must 
address whether the addition or removal of types or categories of 
facilities from the Annual Table complies with section 45Y(b)(2)(A) and 
45Y(b)(2)(B) (which refers to the definition of lifecycle greenhouse 
gas emissions in section 211(o)(1)(H) of the CAA) of the Code and 
proposed Sec.  1.45Y-5. The Treasury Department and the IRS view the 
requirement to publish an expert analysis prepared by the National 
Laboratories of changes to the Annual Table as essential to ensuring 
public accountability and adherence to sound scientific principles. 
This requirement would also ensure that the Secretary has a robust 
record to inform any changes to the Annual Table.
    The Treasury Department and the IRS intend to include in the Annual 
Table the types or categories of facilities that are described in the 
final regulations as having a GHG emissions rate that is not greater 
than zero. The Treasury Department and the IRS intend to publish the 
first Annual Table after the publication of the final regulations. 
Until the first publication of the Annual Table, taxpayers may treat 
the types or categories of facilities that are listed in proposed Sec.  
1.45Y-5(c)(2)(i) through (viii) as being described in an Annual Table 
as having a GHG emissions rate that is not greater than zero. Further, 
any types or categories of facilities that are added or removed from 
this list in the first publication of the Annual Table must be 
accompanied by the publication of an expert analysis of such change as 
provided in proposed Sec.  1.45Y-5(f)(2).
7. Provisional Emissions Rates
    Proposed Sec.  1.45Y-5(g) would provide the rules applicable to 
provisional emissions rates. Proposed Sec.  1.45Y-5(g)(1) would provide 
that, in the case of any facility that is of a type or category for 
which an emissions rate has not been established by the Secretary under 
proposed Sec.  1.45Y-5(g), a taxpayer that owns such facility may file 
a petition with the Secretary for the determination of the emissions 
rate with respect to such facility (Provisional Emissions Rate or PER).
    Proposed Sec.  1.45Y-5(g)(2) would provide that an emissions rate 
has not been established by the Secretary for a facility for purposes 
of section 45Y(b)(2)(C)(ii) if such facility is not described in the 
Annual Table. Proposed Sec.  1.45Y-5(g)(2) would further provide that 
if a taxpayer's request for an emissions value pursuant to proposed 
Sec.  1.45Y-5(g)(5) is pending at

[[Page 47811]]

the time such facility is or becomes described in the Annual Table, the 
taxpayer's request for an emissions value will be automatically denied.
    Proposed Sec.  1.45Y-5(g)(3) would provide the process for filing a 
PER petition. Proposed Sec.  1.45Y-5(g)(3) would provide that to file a 
PER petition with the Secretary, a taxpayer must submit a PER petition 
by attaching it to the taxpayer's Federal income tax return or Federal 
return, as appropriate, for the first taxable year in which the 
taxpayer claims the section 45Y credit with respect to the facility to 
which the PER petition applies. Proposed Sec.  1.45Y-5(g)(3) would 
further provide that a PER petition must contain an emissions value 
and, if applicable, the associated DOE letter. An emissions value may 
be obtained from DOE or by using the LCA model designated in proposed 
Sec.  1.45Y-5(g)(6). An emission value obtained from DOE will be based 
on an analytical assessment of the emissions rate associated with the 
facility, performed by one or more National Laboratories, in 
consultation with other agency experts as appropriate, consistent with 
proposed Sec.  1.45Y-5. A taxpayer would be required to retain in its 
books and records the request to DOE for an emissions value, including 
any information provided by the taxpayer to DOE pursuant to the 
emissions value request process provided in proposed Sec.  1.45Y-
5(g)(5). Alternatively, an emissions value can be determined by the 
taxpayer for a facility using the most recent version of an LCA model 
or models, as of the time the PER petition is filed, that have been 
designated by the Secretary for such use under proposed Sec.  1.45Y-
5(g)(6). If an emissions value is determined using the designated 
model, a taxpayer is required to provide to the IRS information to 
support its determination of the emissions value in the form and manner 
prescribed in IRS forms or instructions or in publications or guidance 
published in the Internal Revenue Bulletin. A taxpayer may not request 
an emissions value from DOE for a facility for which an emissions value 
can be determined by using the most recent version of an LCA model or 
models that have been designated by the Secretary for such use under 
proposed Sec.  1.45Y-5(g)(6).
    Proposed Sec.  1.45Y-5(g)(4) would provide that, upon the IRS's 
acceptance of the taxpayer's Federal income tax return or Federal 
return, as appropriate, containing a PER petition, the emissions value 
of the facility specified on such petition will be deemed accepted. 
Proposed Sec.  1.45Y-5(g)(4) would further provide that a taxpayer 
would be able to rely upon an emissions value provided by DOE for 
purposes of calculating and claiming a section 45Y credit, provided 
that any information, representations, or other data provided to DOE in 
support of the request for an emissions value are accurate. If 
applicable, a taxpayer may rely upon an emissions value determined for 
a facility using the most recent version of the LCA model or models 
that, as of the time the PER petition is filed, have been designated by 
the Secretary for such use under proposed Sec.  1.45Y-5(g)(6), provided 
that any information, representations, or other data used to obtain 
such emissions value are accurate. The IRS's deemed acceptance of an 
emissions value is the Secretary's determination of the PER. Finally, 
proposed Sec.  1.45Y-5(g)(4) would provide that the taxpayer must still 
comply with all applicable requirements for the section 45Y credit and 
any information, representations, or other data supporting an emissions 
value are subject to later examination by the IRS.
    Proposed Sec.  1.45Y-5(g)(5) would provide the rules applicable to 
the emissions value request process. Proposed Sec.  1.45Y-5(g)(5) would 
provide that an applicant that submits a request for an emissions value 
must follow the procedures specified by DOE to request and obtain such 
emissions value, and that emissions values will be determined 
consistent with the rules provided in proposed Sec.  1.45Y-5. Proposed 
Sec.  1.45Y-5(g)(5) would further provide that an applicant may request 
an emissions value from DOE only after a front-end engineering and 
design (FEED) study or similar indication of project maturity, as 
determined by DOE, such as the completion of a project specification 
and cost estimation sufficient to inform a final investment decision 
for the facility. Proposed Sec.  1.45Y-5(g)(5) would provide that DOE 
may decline to review applications that are non-responsive and those 
applications that relate to a facility that is described in the Annual 
Table (consistent with proposed Sec.  1.45Y-5(g)(2)) or a facility that 
can determine an emissions value using a designated LCA model under 
proposed Sec.  1.45Y-5(g)(6) (consistent with proposed Sec.  1.45Y-
5(g)(3)), or applications that are incomplete. Proposed Sec.  1.45Y-
5(g)(5) would also provide that applicants must follow DOE's guidance 
and procedures for requesting and obtaining an emissions value from 
DOE. DOE will publish guidance and procedures that applicants must 
follow to request and obtain an emissions value from DOE. DOE's 
guidance and procedure will include a process, under limited 
circumstances, for a taxpayer to request a revision to DOE's initial 
assessment of an emissions value on the basis of revised technical 
information or facility design and operation. The Treasury Department 
and the IRS anticipate that the emissions value request process will 
open after the publication of the final regulations.
    Proposed Sec.  1.45Y-5(g)(6) would provide that the Secretary may 
designate one or more LCA models for a taxpayer to determine an 
emissions value for C&G Facilities that are not described in the Annual 
Table. Proposed Sec.  1.45Y-5(g)(6) would further provide that a model 
may only be designated if it complies with section 45Y(b)(2)(B) and 
proposed Sec.  1.45Y-5(d) and (e). The Secretary may revoke the 
designation of an LCA model or models. In connection with the 
designation or revocation of a designation of an LCA model or models, 
the Secretary would be required to publish an accompanying expert 
analysis of the model prepared by one or more of the National 
Laboratories, in consultation with other agency experts as appropriate, 
and such analysis must address the model's compliance with section 
45Y(b)(2)(B) of the Code and proposed Sec.  1.45Y-5(d) and (e). The 
Treasury Department and the IRS view the requirement to publish an 
expert analysis prepared by the National Laboratories of the 
designation or revocation of designation of an LCA model or models as 
essential to ensuring public accountability and adherence to sound 
scientific principles. This requirement would also ensure that the 
Secretary has a robust record to inform any designations or revocations 
of an LCA model or models.
    Proposed Sec.  1.45Y-5(g)(7) would provide the rules governing the 
effect of a PER. Proposed Sec.  1.45Y-5(g)(7) would provide that a 
taxpayer may use a PER determined by the Secretary to determine the 
section 45Y credit for the facility to which the PER applies, provided 
all other requirements of section 45Y are met. Proposed Sec.  1.45Y-
5(g)(7) would further provide that the Secretary's PER determination is 
not an examination or inspection of books of account for purposes of 
section 7605(b) of the Code and does not preclude or impede the IRS 
(under section 7605(b) or any administrative provisions adopted by the 
IRS) from later examining a return or inspecting books or records with 
respect to any taxable year for which the section 45Y credit is 
claimed. Finally, proposed Sec.  1.45Y-5(g)(7) would provide that a PER 
determination does not signify that the IRS has determined that the

[[Page 47812]]

requirements of section 45Y have been satisfied for any taxable year.
8. Reliance on Annual Table or Provisional Emissions Rate
    Proposed Sec.  1.45Y-5(h) would provide that taxpayers may rely on 
the Annual Table in effect as of the date a facility began construction 
or the provisional emissions rate that has been determined by the 
Secretary for the taxpayer's facility under proposed Sec.  1.45Y-
5(g)(4) to determine the facility's GHG emissions rate for that 
facility for any taxable year that is within the 10-year period 
described in section 45Y(b)(1)(B), provided that the facility continues 
to operate as a type of facility that is described in the Annual Table 
or the facility's emissions value request, as applicable, for the 
entire taxable year.
9. Substantiation
    Taxpayers have a general obligation to substantiate and verify that 
they have met the requirements of any tax credits claimed on their tax 
returns. Section 6001 of the Code provides that every person liable for 
any tax imposed by the Code, or for the collection thereof, must keep 
such records as the Secretary may from time to time prescribe. Section 
1.6001-1(a) provides that any person subject to income tax must keep 
such permanent books of account or records as are sufficient to 
establish the amount of gross income, deductions, credits, or other 
matters required to be shown by such person in any return of such tax. 
Section 1.6001-1(e) provides that the books and records required by 
Sec.  1.6001-1 must be retained so long as the contents thereof may 
become material in the administration of any internal revenue law.
    In addition to this general obligation to substantiate eligibility 
for a claimed tax credit, taxpayers may also be required to keep 
specific records as prescribed by the Secretary. This may be 
appropriate for purposes of the section 45Y credit because certain 
types of facilities may depend on operational choices, such as the use 
of certain types of feedstocks or fuels or engaging in carbon capture 
and sequestration, to achieve a net GHG emissions rate that is not 
greater than zero for a taxable year, and these operational choices may 
vary by year. Proposed Sec.  1.45Y-5(i)(1) would provide that a 
taxpayer must maintain in its books and records documentation regarding 
the design, operation, and if applicable, feedstock or fuel source used 
by the facility that establishes that such facility had a GHG emissions 
rate, as determined under Sec.  1.45Y-5, that is not greater than zero 
for the taxable year. The Treasury Department and the IRS intend to 
require in the final regulations that taxpayers maintain specific types 
of documentation to substantiate that a facility for which a section 
45Y credit is claimed has a net GHG emissions rate that is not greater 
than zero. The Treasury Department and the IRS request comment on the 
types of documentation taxpayers should be required to maintain to 
substantiate eligibility for the section 45Y credit.
    Proposed Sec.  1.45Y-5(i)(2) would further provide that 
documentation that is sufficient to substantiate that a facility had a 
GHG emissions rate of not greater than zero includes documentation or a 
report prepared by an unrelated party that verifies that a facility had 
such an emissions rate. Proposed Sec.  1.45Y-5(i)(2) would also provide 
that facilities described in Sec.  1.45Y-5(c)(2) can maintain 
sufficient documentation to demonstrate a GHG emissions rate showing 
that the facility is described in Sec.  1.45Y-5(c)(2). Finally, 
proposed Sec.  1.45Y-5(i)(2) would provide that future guidance may 
describe sufficient documentation to substantiate that certain 
facilities have a GHG emissions rate of not greater than zero. Because 
certain types or categories of facilities may have emissions rates that 
are highly variable and dependent on complex interactions between 
design choices, operational choices, and fuel and feedstock sourcing 
choices, the Treasury Department and the IRS seek comment on the 
relative risk of inadvertently crediting above-zero-emissions 
electricity generation for types or categories of facilities that may 
potentially be eligible for the section 45Y credit. In addition, 
comment is also requested on supply chain tracing and substantiation 
requirements that the Treasury Department and the IRS may require in 
the final regulations to demonstrate whether a facility used a specific 
fuel to produce electricity and that such fuel has the emissions 
attributes claimed by the taxpayer. Specifically, to inform the 
development of the substantiation rules for the Clean Electricity Tax 
Credits, comment is requested on the following topics:
    (1) What types of documentation or substantiation should a taxpayer 
maintain to establish that an input in the supply chain of a fuel/
feedstock used for electricity production has the energy attributes or 
other relevant characteristics (for example, source and production 
process) that were taken into account in determining a GHG emissions 
rate?
    (2) What existing systems, industry standards, or practices may be 
used to substantiate that a facility's operations and the supply chain 
for the inputs it used to produce electricity resulted in a GHG 
emissions rate that is not greater than zero for a taxable year? If 
existing systems, standards, or practices are currently not 
sufficiently developed to serve as a form of substantiation, how should 
such tracking and verification systems be developed and how long might 
such development take?
    (3) What supply chain tracing systems or verification bodies 
address fuels or feedstocks that may be commonly used by facilities 
that may be eligible for the Clean Electricity Tax Credits? What fuels 
or feedstocks could these systems or bodies address and for what 
purpose?
E. One-Megawatt Exception for Section 45Y
    The Treasury Department and the IRS intend to provide a more 
detailed definition for the One-Megawatt Exception in section 
45Y(a)(2)(B)(i) by expanding upon the definition provided in the August 
Proposed Regulations. The final regulations would provide that, for 
purposes of section 45Y(a)(2)(B)(i), the determination of whether a 
qualified facility has a maximum net output of less than one megawatt 
of electricity (as measured in alternating current) is determined based 
on the nameplate capacity. If applicable, taxpayers must use the 
International Standard Organization (ISO) conditions to measure the 
maximum electrical generating output of a qualified facility. For 
purposes of this measurement, the nameplate capacity is the maximum 
electrical generating output in MW (as measured in alternating current) 
that the qualified facility is capable of producing on a steady state 
basis and during continuous operation under standard conditions, as 
measured by the manufacturer and consistent with the definition of 
nameplate capacity provided in 40 CFR 96.202. The Treasury Department 
and the IRS request comment on this proposed definition. This rule is 
proposed to apply to qualified facilities placed in service after 
December 31, 2024, and during taxable years ending on or after the date 
of publication of the final regulations in the Federal Register.

II. Rules Applicable to the Clean Electricity Investment Tax Credit

    These proposed regulations are organized in five sections, proposed 
Sec. Sec.  1.48E-1 through 1.48E-5 (section 48E regulations). Proposed 
Sec.  1.48E-1 would provide an overview of the section 48E regulations, 
generally applicable definitions, and the rules applicable to the 
calculation of section 48E credit. Proposed Sec.  1.48E-2 would provide 
rules

[[Page 47813]]

relating to a qualified facility, a qualified investment, a qualified 
property, and an energy storage technology (EST). Section 1.48E-3 is 
reserved for rules relating to the increased credit amount for meeting 
the prevailing wage and apprenticeship requirements. A cross reference 
will be added to Sec.  1.48E-3 in the final regulations when Sec.  
1.48E-3 is finalized. Proposed Sec.  1.48E-4 would provide the rules of 
general application under section 48E, including the rules regarding 
the inclusion of qualified interconnection costs in the basis of a low-
output associated qualified facility, rules for expansion of a facility 
and incremental production, rules for retrofitting an existing 
facility, rules for the ownership of a qualified facility or an EST, 
rules regarding the coordination of the section 48E credit with other 
Federal income tax credits, and rules for credit recapture. Proposed 
Sec.  1.48E-5 would provide rules pertaining to the determination of a 
GHG emissions rate for a facility under section 48E.
A. Amount of Credit
    Proposed Sec.  1.48E-1(a) would provide an overview of the section 
48E regulations and provide definitions of terms for purposes of the 
section 48E regulations. Proposed Sec.  1.48E-1(b) would explain how to 
calculate the amount of the section 48E credit for any taxable year.
    Proposed Sec.  1.48E-1(b)(1) would provide that the credit is an 
amount equal to the applicable percentage of the qualified investment 
for such taxable year with respect to any qualified facility (as 
defined in proposed Sec.  1.48E-2(a)) and any EST (as defined in 
proposed Sec.  1.48E-2(g)). Proposed Sec.  1.48E-1(b)(2) would define 
the applicable percentage as the base rate in proposed Sec.  1.48E-
1(b)(3) or the alternative rate in proposed Sec.  1.48E-1(b)(4). 
Proposed Sec.  1.48E-1(b)(2) would also propose that the applicable 
percentage may be increased as provided in section 48E(a)(3)(A) and 
proposed Sec.  1.48E-1(b)(5) in the case of a qualified facility that 
is located in an energy community. Similarly, Sec.  1.48E-1(b)(2) would 
propose that the applicable percentage may be increased as provided in 
section 48E(a)(3)(B) and proposed Sec.  1.48E-1(b)(6) in the case of a 
qualified facility that satisfies the domestic content requirements.
    Proposed Sec.  1.48E-1(b)(3) would describe the base rate as 6 
percent. Proposed Sec.  1.48E-1(b)(4) would describe the alternative 
rate as 30 percent if certain prevailing wage and apprenticeship 
requirements are satisfied.
    Proposed Sec.  1.48E-1(b)(5) would provide rules applicable to the 
energy communities increase in credit rate. Proposed Sec.  1.48E-
1(b)(6) would provide rules applicable to the domestic content increase 
in credit rate.
    Proposed Sec.  1.48E-1(c) would provide the credit phase-out rules. 
Generally, proposed Sec.  1.48E-1(c)(1) would provide that the amount 
of the clean electricity investment credit under section 48E for any 
qualified facility or EST the construction of which begins during a 
calendar year described in section 48E(e)(2) is equal to the product of 
the amount of the credit determined under section 48E(a) and proposed 
Sec.  1.48E-1(b) without regard to section 48E(e), multiplied by the 
phase-out percentage under section 48E(e)(2) and proposed Sec.  1.48E-
1(c)(2). Proposed Sec.  1.48E-1(c)(2) would provide that the phase-out 
percentage is 100 percent for any qualified investment with respect to 
any qualified facility or EST the construction of which begins during 
the first calendar year following the applicable year; 75 percent for 
any qualified investment with respect to any qualified facility or EST 
the construction of which begins during the second calendar year 
following the applicable year; 50 percent for any qualified investment 
with respect to any qualified facility or EST the construction of which 
begins during the third calendar year following the applicable year; 
and 0 percent for any qualified investment with respect to any 
qualified facility or EST the construction of which begins during any 
calendar year subsequent to the calendar year described in section 
48E(e)(2)(C). Proposed Sec.  1.48E-1(c)(3) would define ``applicable 
year'' for purposes of proposed Sec.  1.48E-1(c) as having the same 
meaning as provided in proposed Sec.  1.45Y-1(c)(3).
B. Qualified Facility
    Proposed Sec.  1.48E-2(a) would define a ``qualified facility'' to 
mean a facility that is used for the generation of electricity; is 
placed in service by the taxpayer after December 31, 2024; and has a 
GHG emissions rate of not greater than zero (as determined under rules 
provided in Sec.  1.45Y-5).
1. Property Included in Qualified Facility
    Proposed Sec.  1.48E-2(b) would provide that a qualified facility 
includes a unit of qualified facility (as defined in proposed Sec.  
1.48E-2(b)(2)(i)) and property owned by the same taxpayer that is 
integral to the unit of qualified facility (as described in proposed 
Sec.  1.48E-2(b)(3)). Proposed Sec.  1.48E-2(b)(1) would provide that 
any component of property that meets the requirements of proposed Sec.  
1.48E-2(b) is part of a qualified facility regardless of where such 
component of property is located. Proposed Sec.  1.48E-2(b)(1) would 
provide that a qualified facility does not include any electrical 
transmission equipment, such as transmission lines and towers, or any 
equipment beyond the electrical transmission stage. Proposed Sec.  
1.48E-2(b)(1) would also provide that a qualified facility generally 
does not include equipment that is an addition or modification to an 
existing qualified facility. However, proposed Sec.  1.48E-2(b)(1) 
would reference proposed Sec.  1.48E-4(b) regarding the expansion of a 
facility or incremental production and proposed Sec.  1.48E-4(c) for 
rules regarding retrofitted facilities (80/20 Rule).
2. Functionally Interdependent
    Proposed Sec.  1.48E-2(b)(2)(i) would provide that the unit of a 
qualified functionally interdependent components of a property (as 
defined in Sec.  1.48E-2(b)(2)(ii) owned by the taxpayer that are 
operated together and that can operate apart from other property to 
produce electricity. Proposed Sec.  1.48E-2(b)(2)(i) would further 
provide that no provision of this section, Sec.  1.48E-1, or Sec.  
1.48E-4 through 1.48E-5 uses the term ``unit'' in respect of a 
qualified facility with any meaning other than that provided in Sec.  
1.48E-2(b)(2)(ii). A reference to Sec.  1.48E-3 will also be added to 
the previous sentence in proposed Sec.  1.48E-2(b)(2)(i) when that 
regulation is finalized, but it cannot be added until Sec.  1.48E-3 is 
finalized. Proposed Sec.  1.48E-2(b)(2)(ii) would define components as 
``functionally interdependent'' if the placing in service of each of 
the components is dependent upon the placing in service of each of the 
other components to produce electricity.
3. Integral Part
    Proposed Sec.  1.48E-2(b)(3)(i) would provide that property owned 
by a taxpayer is an integral part of a qualified facility owned by the 
same taxpayer if it is used directly in the intended function of the 
qualified facility and is essential to the completeness of the intended 
function. Proposed Sec.  1.48E-2(b)(3)(i) would also clarify that 
property that is an integral part of a qualified facility is part of 
the qualified facility. Lastly, proposed Sec.  1.48E-2(b)(3)(i) would 
explain that a taxpayer may not claim the section 48E credit for any 
property that is an integral part of a qualified facility that is not 
owned by the taxpayer.

[[Page 47814]]

    Proposed Sec.  1.48E-2(b)(3)(ii) would describe power conditioning 
equipment and transfer equipment as integral parts of a qualified 
facility. Proposed Sec.  1.48E-2(b)(3)(ii) would further provide that 
power conditioning equipment includes equipment that modifies the 
characteristics of electricity into a form suitable for use or 
transmission or distribution. Proposed Sec.  1.48E-2(b)(3)(ii) would 
also provide that parts related to the functioning or protection of 
power conditioning equipment are also treated as power conditioning 
equipment and include examples.
    Proposed Sec.  1.48E-2(b)(3)(ii) would further provide that 
transfer equipment includes components that permit the aggregation of 
electricity generated by components of qualified facilities and 
components that alter voltage to permit transfer to a transmission or 
distribution line and would clarify that transfer equipment does not 
include transmission or distribution lines. Proposed Sec.  1.45Y-
2(b)(3)(ii) would provide examples of transfer equipment that include, 
but are not limited to, wires, cables, and combiner boxes that conduct 
electricity. Proposed Sec.  1.45Y-2(b)(3)(ii) would provide that parts 
related to the functioning or protection of transfer equipment are also 
treated as transfer equipment and include examples.
    Proposed Sec.  1.48E-2(b)(3)(iii) would provide that roads that are 
an integral part of a qualified facility are those roads integral to 
the intended function of the qualified facility such as onsite roads 
that are used to operate and maintain the qualified facility. Proposed 
Sec.  1.48E-2(b)(3)(iii) would also clarify that roads primarily for 
access to the site, or roads used primarily for employee or visitor 
vehicles, are not integral to the intended function of the qualified 
facility, and thus are not an integral part of a qualified facility.
    Proposed Sec.  1.48E-2(b)(3)(iv) and (v) would provide that fences 
and buildings (also referred to as structures) are generally not 
integral parts of a qualified facility because they are not integral to 
the intended function of the qualified facility. However, a building 
(or structure) may be an integral part of a qualified facility if it is 
essentially an item of machinery or equipment and a structure that 
houses property that is integral to the intended function of the 
qualified facility, if the use of the structure is so closely related 
to the use of the housed components of property therein that the 
structure clearly can be expected to be replaced if the components of 
property it initially houses are replaced.
    Proposed Sec.  1.48E-2(b)(3)(vi) would provide a rule for shared 
integral property stating that multiple qualified facilities (whether 
owned by one or more taxpayers), including qualified facilities with 
respect to which a taxpayer has claimed a credit under section 48E or 
another Federal income tax credit, may include shared property that may 
be considered an integral part of each qualified facility so long as 
the cost basis for the shared property is properly allocated to each 
qualified facility and the taxpayer only claims a section 48E credit 
with respect to the portion of the cost basis properly allocable to a 
facility for which the taxpayer is claiming a section 48E credit. 
Proposed Sec.  1.48E-2(b)(3)(vi) would further clarify that the total 
cost basis of such shared property divided among the qualified 
facilities may not exceed 100 percent of the cost of such shared 
property. Lastly, proposed Sec.  1.48E-2(b)(3)(vi) specifies that 
property that is shared by a qualified facility (as defined in section 
48E(b)(3)) (48E Qualified Facility) and a qualified facility (as 
defined by section 45Y(b) (45Y Qualified Facility) that is an integral 
part of both qualified facilities will not affect the eligibility of 
the 48E Qualified Facility for the section 48E credit or the 45Y 
Qualified Facility for the section 45Y credit.
4. Coordination With Other Credits
    Proposed Sec.  1.48E-2(c)(1) would provide that the term 
``qualified facility'' (as defined in section 48E(b)(3)) will not 
include any facility for which a credit determined under section 45, 
45J, 45Q, 45U, 45Y, 48, or 48A is allowed under section 38 for the 
taxable year or any prior taxable year. Proposed Sec.  1.48E-2(c)(1) 
would further clarify that a taxpayer that directly owns a qualified 
facility (as defined in section 48E(b)(3)) that is eligible for both a 
section 48E credit and another Federal income tax credit is eligible 
for the section 48E credit only if the other Federal income tax credit 
was not allowed with respect to the qualified facility. Proposed Sec.  
1.48E-2(c)(1) would provide that nothing in proposed Sec.  1.48E-2(c) 
precludes a taxpayer from claiming a section 48E credit with respect to 
a qualified facility (as defined in section 48E(b)(3)) that is co-
located with another facility for which a credit determined under 
section 45, 45J, 45Q, 45U, 45Y, 48, or 48A is allowed under section 38 
for the taxable year or any prior taxable year.
    Proposed Sec.  1.48E-2(c)(2) would clarify that for purposes of 
proposed Sec.  1.48E-2(c)(1), the term ``allowed'' only includes 
credits that taxpayers have claimed on a Federal income tax return or 
Federal return, as appropriate, and that the IRS has not challenged in 
terms of the taxpayer's eligibility.
    Proposed Sec.  1.48E-2(c)(3) would include several examples that 
illustrate the application of the rules provided in proposed Sec.  
1.48E-2(c).
5. Qualified Investment With Respect to a Qualified Facility
    Proposed Sec.  1.48E-2(d) would describe a qualified investment 
with respect to any qualified facility for any taxable year as the sum 
of the basis of any qualified property (as defined in proposed Sec.  
1.48E-2(e)(1)) placed in service by the taxpayer during such taxable 
year that is part of a qualified facility (as defined in proposed Sec.  
1.48E-2(a)) and the amount of any expenditures paid or incurred by the 
taxpayer for qualified interconnection property (as defined in proposed 
Sec.  1.48E-4(a)(2)).
6. Qualified Property
a. Generally
    Proposed Sec.  1.48E-2(e) would define ``qualified property'' for 
purposes of proposed Sec.  1.48E-2(a) to mean property that meets three 
requirements. First, proposed Sec.  1.48E-2(e)(1)(i) would require that 
the property is tangible personal property (as defined in proposed 
Sec.  1.48E-2(f)(1)) or other tangible property (not including a 
building or its structural components) (as defined in proposed Sec.  
1.48E-2(f)(2)), but only if such other tangible property is used as an 
integral part (as defined proposed Sec.  1.48E-2(b)(3)) of the 
qualified facility (as defined in proposed Sec.  1.48E-2(a)).
    Second, proposed Sec.  1.48E-2(e)(1)(ii) would require that 
depreciation (or amortization in lieu of depreciation) be allowable (as 
defined in proposed Sec.  1.48E-2(f)(6)) with respect to the property.
    Third, proposed Sec.  1.48E-2(e)(1)(iii) would require that the 
taxpayer either constructs, reconstructs, or erects the property (as 
defined in proposed Sec.  1.48E-2(f)(3)) or acquires the property (as 
defined in proposed Sec.  1.48E-2(f)(4)) if the original use of the 
property (as defined in proposed Sec.  1.48E-2(f)(5)) commences with 
the taxpayer.
    Proposed Sec.  1.48E-2(e)(2) would provide that any component of a 
qualified property that meets the requirements of proposed Sec.  1.48E-
2(e) is part of a qualified facility regardless of where such component 
of property is located.

[[Page 47815]]

b. Definitions Related to Qualified Property
Tangible Personal Property
    Proposed Sec.  1.48E-2(f)(1) would define the term ``tangible 
personal property'' for purposes of section 48E and proposed Sec.  
1.48E-2(b) to mean any tangible property except land and improvements 
thereto, such as buildings or other inherently permanent structures 
(including items that are structural components of such buildings or 
structures). Proposed Sec.  1.48E-2(f)(1) would further provide that 
tangible personal property includes all property (other than structural 
components) that is contained in or attached to a building and that all 
property that is in the nature of machinery (other than structural 
components of a building or other inherently permanent structure) is 
considered tangible personal property even though located outside a 
building. Finally, proposed Sec.  1.48E-2(f)(1) would clarify that 
local law is not controlling for purposes of determining whether 
property is or is not tangible property or tangible personal property. 
Therefore, proposed Sec.  1.48E-2(f)(1) would explain that tangible 
property may be personal property for purposes of the section 48E 
credit even though under local law the property is considered a fixture 
and therefore real property.
Other Tangible Property
    Proposed Sec.  1.48E-2(f)(2) would define the term ``other tangible 
property'' to mean tangible property other than tangible personal 
property (not including a building and its structural components), that 
is used as an integral part of furnishing electricity by a person 
engaged in a trade or business of furnishing any such service.
Construction, Reconstruction, or Erection of Qualified Property
    Proposed Sec.  1.48E-2(f)(3) would define the term ``construction, 
reconstruction, or erection of qualified property'' to mean work 
performed to construct, reconstruct, or erect qualified property either 
by the taxpayer or for the taxpayer in accordance with the taxpayer's 
specifications.
Acquisition of Qualified Property
    Proposed Sec.  1.48E-2(f)(4) would define the term ``acquisition of 
qualified property'' to mean a transaction by which a taxpayer obtains 
rights and obligations with respect to qualified property including 
title to the qualified property under the law of the jurisdiction in 
which the qualified property is placed in service, unless the qualified 
property is possessed or controlled by the taxpayer as a lessee, and 
physical possession or control of the qualified property.
Original Use of Qualified Property
    Proposed Sec.  1.48E-2(f)(5)(i) would provide that the term 
``original use of qualified property'' means the first use to which 
qualified property is put, whether or not such use is by the taxpayer. 
Proposed Sec.  1.48E-2(f)(5)(ii) would clarify that a retrofitted 
qualified facility acquired by the taxpayer will not be treated as 
being put to original use by the taxpayer unless the rules in proposed 
Sec.  1.48E-4(c) regarding retrofitted qualified facilities (80/20 
Rule) apply. Proposed Sec.  1.48E-2(f)(5)(ii) explains that the 
question of whether a qualified facility meets the 80/20 Rule is a 
facts and circumstances determination.
Depreciation Allowable
    Proposed Sec.  1.48E-2(f)(6)(i) would provide a general rule for 
purposes of applying proposed Sec.  1.48E-2(b), that depreciation (or 
amortization in lieu of depreciation) is allowable with respect to 
qualified property if such property is of a character subject to the 
allowance for depreciation under section 167 of the Code and the basis 
or cost of such property is recovered using a method of depreciation 
(for example, the straight line method), which includes any additional 
first year depreciation deduction method of depreciation (for example, 
under section 168(k) of the Code). Proposed Sec.  1.48E-2(f)(6)(i) 
would further clarify that if an adjustment with respect to the Federal 
income tax or Federal return for such taxable year requires the basis 
or cost of such qualified property to be recovered using a method of 
depreciation, depreciation is allowable to the taxpayer with respect to 
the qualified property. Proposed Sec.  1.48E-2(f)(6)(ii) would describe 
exclusions from allowable depreciation stating that for purposes of 
proposed Sec.  1.48E-2(b), depreciation is not allowable with respect 
to a qualified facility if the basis or cost of such qualified facility 
is not recovered through a method of depreciation but, instead, such 
basis or cost is recovered through a deduction of the full basis or 
cost of the qualified facility in one taxable year (for example, under 
section 179 of the Code).
Placed in Service
    Proposed Sec.  1.48E-2(f)(7)(i) would provide the general rule for 
determining when a qualified facility has been placed in service for 
purposes of the section 48E credit. Proposed Sec.  1.48E-2(f)(7)(ii) 
would provide that notwithstanding the general placed in service rules 
provided in proposed Sec.  1.48E-2(b)(7)(i), a qualified facility with 
respect to which an election is made under Sec.  1.48-4 to treat the 
lessee as having purchased such qualified facility is considered placed 
in service by the lessor in the taxable year in which possession is 
transferred to such lessee.
Claim
    Proposed Sec.  1.48E-2(f)(8) would provide that with respect to a 
section 48E credit determined with respect to qualified facility of a 
taxpayer, the term ``claim'' would be defined to mean filing a 
completed Form 3468, Investment Credit, or any successor form(s), with 
the taxpayer's timely filed (including extensions) Federal income tax 
return or Federal return, as appropriate, for the taxable year in which 
the qualified facility is placed in service, and includes making an 
election under section 6417 or 6418 of the Code and corresponding 
regulations with respect to such section 48E credit and made on the 
taxpayer's filed return.
C. Energy Storage Technology
1. General Rule
    Proposed Sec.  1.48E-2(g)(1) would provide that an EST includes a 
unit of EST that meets the requirements of proposed Sec.  1.48E-
2(g)(2)(i). An EST also would include property owned by the taxpayer 
that is an integral part (as defined in proposed Sec.  1.48E-2(g)(3)) 
of the unit of EST. Proposed Sec.  1.48E-2(g)(1) would provide that 
equipment that is an addition or modification to an existing EST is not 
eligible for the section 48E credit. Proposed Sec.  1.48E-2(g)(1) would 
further provide that, an EST would include electrical energy storage 
property described in proposed Sec.  1.48E-2(g)(6)(i), thermal energy 
storage property described in proposed Sec.  1.48E-2(g)(6)(ii), and 
hydrogen energy storage property described in proposed Sec.  1.48E-
2(g)(6)(iii).
    Proposed Sec.  1.48E-2(g)(2) would provide that a unit of EST 
includes all functionally interdependent components of property (as 
defined in proposed Sec.  1.48E-2(g)(2)(ii)), owned by the taxpayer 
that are operated together and that can operate apart from other 
property to perform the intended function of the EST.
2. Functionally Interdependent
    Proposed Sec.  1.48E-2(g)(2)(i) would provide that for purposes of 
the section 48E credit, a unit of EST includes all functionally 
interdependent components of property (as defined in paragraph proposed 
Sec.  1.48E-2(g)(2)(ii))

[[Page 47816]]

owned by the taxpayer that are operated together and that can operate 
apart from other property to perform the intended function of the EST. 
Proposed Sec.  1.48E-2(g)(2)(i) would also provide that no provision of 
this section, Sec.  1.48E-1, or Sec.  1.48E-3 through 1.48E-5 uses the 
term unit in respect of an EST with any meaning other than that 
provided in Sec.  1.48E-2(g)(2)(i). Proposed Sec.  1.48E-2(g)(2)(ii) 
would provide that components are functionally interdependent if the 
placing in service of each of the components is dependent upon the 
placing in service of each of the other components to perform the 
intended function of the EST.
3. Integral Part
    Proposed Sec.  1.48E-2(g)(3) would provide that property owned by a 
taxpayer is an integral part of EST owned by the same taxpayer if it is 
used directly in the intended function of the EST and is essential to 
the completeness of such function. Proposed Sec.  1.48E-2(g)(3) would 
also provide that property that is an integral part of an EST is part 
of an EST. Lastly, proposed Sec.  1.48E-2(g)(3) would provide that a 
taxpayer may not claim the section 48E credit for any property that is 
an integral part of an EST that is not owned by the taxpayer.
4. Qualified Investment With Respect to Energy Storage Technology
    Proposed Sec.  1.48E-2(g)(4) would describe the qualified 
investment with respect to any EST for any taxpayer year as the basis 
of any EST placed in service by the taxpayer during such taxable year.
5. Placed in Service
    Proposed Sec.  1.48E-2(g)(5)(i) would provide rules for determining 
when an EST has been placed in service for purposes of the section 48E 
credit. Proposed Sec.  1.48E-2(g)(5)(ii) also would provide that 
notwithstanding the general placed in service rules provided in 
proposed Sec.  1.48E-2(g)(5)(i), an EST with respect to which an 
election is made under Sec.  1.48-4 to treat the lessee as having 
purchased such EST is considered placed in service by the lessor in the 
taxable year in which possession is transferred to such lessee.
6. Types of Energy Storage Technologies
    Proposed Sec.  1.48E-2(g)(6)(i) would describe electrical energy 
storage property as property (other than property primarily used in the 
transportation of goods or individuals and not for the production of 
electricity) that receives, stores, and delivers energy for conversion 
to electricity and has a nameplate capacity of not less than 5 kWh. See 
subsection C of Overview of Section 48E. Proposed Sec.  1.48E-
2(g)(6)(i) also would provide examples of such electrical energy 
storage property, subject to the exclusion for property primarily used 
in the transportation of goods or individuals.
    The Treasury Department and the IRS understand that this exclusion 
for property primarily used in the transportation of goods or 
individuals, at a minimum, would apply to batteries and other EST that 
are incorporated into or otherwise physically integrated within motor 
vehicles and other modes of transportation of goods or individuals and 
from which an electric motor of such vehicle or other mode of 
transportation draws electricity for propulsion.
    Proposed Sec.  1.48E-2(g)(6)(ii) would describe thermal energy 
storage property as property comprising a system that is directly 
connected to a heating, ventilation, or air conditioning (HVAC) system; 
removes heat from, or adds heat to, a storage medium for subsequent 
use; and provides energy for the heating or cooling of the interior of 
a residential or commercial building. See section C of Overview of 
Section 48E. Proposed Sec.  1.48E-2(g)(6)(ii) would also provide that 
thermal energy storage property includes equipment and materials, and 
parts related to the functioning of such equipment, to store thermal 
energy for later use to heat or cool, or to provide hot water for use 
in heating a residential or commercial building. In addition, proposed 
Sec.  1.48E-2(g)(6)(ii) would provide that thermal energy storage 
property does not include a swimming pool, CHP property, or a building 
or its structural components. Lastly, proposed Sec.  1.48E-2(g)(6)(ii) 
would provide examples of thermal energy storage property.
    Proposed Sec.  1.48E-2(g)(6)(iii) would provide that hydrogen 
energy storage property is property (other than property primarily used 
in the transportation of goods or individuals and not for the 
production of electricity) that stores hydrogen and has a nameplate 
capacity of not less than 5 kWh, equivalent to 0.127 kg of hydrogen or 
52.7 standard cubic feet (scf) of hydrogen. Proposed Sec.  1.48E-
2(g)(6)(iii) would also provide that hydrogen energy storage property 
must store hydrogen that is solely used as energy and not for other 
purposes such as for the production of end products such as fertilizer. 
Proposed Sec.  1.48E-2(g)(6)(iii) would also provide examples of 
hydrogen energy storage property.
    Although the list of examples of energy storage technologies that 
proposed Sec.  1.48E-2(g)(6) would provide is nonexclusive, and 
therefore many other technologies that are not addressed would meet 
these functional definitions, there are some examples that do not meet 
the functional definition. For example, some technologies are marketed 
as ``virtual batteries,'' which are aggregations of controllable 
electricity demand providing similar electrical grid services to an 
electrical grid battery. Such ``virtual batteries'' receive energy in 
the form of electricity, but they do not store it for later discharge 
as electricity. The function of ``virtual batteries'' is to shift 
demand to different points in time. Because such demand shifting is not 
a storage activity for purposes of section 48(c)(6) (and thus for 
purposes of section 48E(c)(2)), this technology is not an EST. There 
are other technologies for which the determination of whether they meet 
the statutory requirements is less clear.
7. Modification of Energy Storage Technology
    Proposed Sec.  1.48E-2(g)(7) would provide rules for modification 
of EST. Based on the rules in section 48(c)(6)(B), proposed Sec.  
1.48E-2(g)(7) would provide that with respect to electrical energy 
storage property and hydrogen energy storage property, modified as set 
forth in proposed Sec.  1.48E-2(g)(7), such property will be will be 
treated as an electrical energy storage property (as described in 
proposed Sec.  1.48E-2(g)(6)(i)) or a hydrogen energy storage property 
(as described in proposed Sec.  1.48E-2(g)(6)(iii)), except that the 
basis of any existing electrical energy storage property or hydrogen 
energy storage property prior to such modification is not taken into 
account for purposes of proposed Sec.  1.48E-2(g)(7) and section 48E.
8. Claim
    Proposed Sec.  1.48E-2(g)(8) would provide that with respect to a 
section 48E credit determined with respect to an EST of a taxpayer, the 
term ``claim'' means filing a completed Form 3468, Investment Credit, 
or any successor form(s), with the taxpayer's timely filed (including 
extensions) Federal income tax return or Federal return, as 
appropriate, for the taxable year in which the EST is placed in 
service, and includes making an election under section 6417 or 6418 and 
corresponding regulations with respect to such section 48E credit and 
made on the taxpayer's filed return.

[[Page 47817]]

D. Rules of General Application to Section 48E
1. Rules for Certain Lower-Output Qualified Facilities
    Proposed Sec.  1.48E-4(a)(1) would provide rules for qualified 
facilities with a maximum net output of not greater than 5 megawatts to 
include qualified interconnection costs in the basis of an associated 
qualified facility. Proposed Sec.  1.48E-4(a)(1) would provide that the 
qualified investment for a qualified facility includes amounts paid or 
incurred by the taxpayer for qualified interconnection property in 
connection with the installation of a qualified facility that has a 
maximum net output of not greater than 5 MW (as measured in alternating 
current) (Five-Megawatt Limitation). Proposed Sec.  1.48E-4(a)(1) would 
provide that the qualified interconnection property must provide for 
the transmission or distribution of the electricity produced by a 
qualified facility and must be properly chargeable to the capital 
account of the taxpayer as reduced by proposed Sec.  1.48E-4(a)(6). 
Proposed Sec.  1.48E-4(a)(2) would define the term ``qualified 
interconnection property.'' Proposed Sec.  1.48E-4(a)(2) would further 
provide that qualified interconnection property is not taken into 
account to determine if a qualified facility meets the requirements for 
the increase in credit rate for energy communities or domestic content 
because qualified interconnection property is not part of a qualified 
facility.
    Proposed Sec.  1.48E-4(a)(3) would describe the Five-Megawatt 
Limitation as a measurement taken at the qualified facility level. 
Proposed Sec.  1.48E-4(a)(3)(i) would provide that the maximum net 
output of a qualified facility is measured only by the nameplate 
generating capacity of the unit of qualified facility, which does not 
include the nameplate capacity of any integral property, at the time 
that the qualified facility is placed in service. Further, proposed 
Sec.  1.48E-4(a)(3)(i) would also provide that the nameplate generating 
capacity of the unit of qualified facility is measured independently 
from any other qualified facilities that share the same integral 
property.
    Proposed Sec.  1.48E-4(a)(4) would define the term 
``interconnection agreement.'' and proposed Sec.  1.48E-4(a)(5) would 
define the term ``utility.''
    Proposed Sec.  1.48E-4(a)(6) would provide that expenses paid or 
incurred for qualified interconnection property and amounts otherwise 
chargeable to capital account with respect to such expenses must be 
reduced under rules similar to the rules contained in section 50(c). 
The taxpayer must pay or incur the interconnection property costs, and 
therefore, any reimbursement, including by a utility, must be accounted 
for by reducing the taxpayers' expenditure to determine eligible costs.
    A taxpayer that is reimbursed for these costs may not include such 
reimbursed costs in the amount paid or incurred by the taxpayer for 
qualified interconnection property. Proposed Sec.  1.48E-4(a)(6) would 
adopt this rule. In the case of a utility reimbursing a taxpayer for 
costs the taxpayer pays or incurs for qualified interconnection 
property, the utility should provide the taxpayer with information 
regarding such costs by the date on which the project is placed in 
service.
    The Treasury Department and the IRS are aware of common situations 
in which a taxpayer could ultimately receive a payment, credit, or 
service from another entity, including a utility, related to the costs 
the taxpayer pays or incurs for qualified interconnection property. For 
example, one taxpayer may place in service a qualified facility and 
make payments to a utility with respect to qualified interconnection 
property involving the addition, modification, or upgrade to the 
utility's transmission system related to such qualified facility. 
Subsequently, a different taxpayer may, at a later date, place in 
service a qualified facility and make payments to the same utility 
related to the same additions, modifications, or upgrades to the 
utility's transmission system that were made in response to the first 
taxpayer's interconnection. The utility may pay, credit, or provide 
services to the first taxpayer in an amount related to the costs paid 
by the second taxpayer. The likely amount or timing of any such 
payment, credit, or service would not be known at the time the first 
taxpayer interconnects to the utility's transmission system.
    The Treasury Department and the IRS request comment on whether such 
payment, credit, or service received by the first taxpayer, as the 
result of subsequent payments made to a utility by other parties, 
should be treated as a reimbursement to the first taxpayer and impact 
the amount of the costs of qualified interconnection property that the 
first taxpayer may include in its basis for purposes of the section 48E 
credit. The Treasury Department and the IRS also request comment on 
whether the costs paid by the second taxpayer should be treated as 
amounts paid or incurred for qualified interconnection property in 
connection with the installation of the second taxpayer's qualified 
facility. The Treasury Department and the IRS request comment on 
industry practices relevant to the determination of costs paid or 
incurred for qualified interconnection property, including the 
accounting treatment of costs paid or incurred for qualified 
interconnection property. The Treasury Department and the IRS also 
request comment on whether any clarifications are needed regarding the 
tax treatment of amounts paid or incurred for qualified interconnection 
property, including reimbursement of costs paid or incurred by a 
taxpayer for qualified interconnection costs.
    In section 3.02(1)(b)(ii) of Notice 2022-49, the Treasury 
Department and the IRS requested comments concerning what type of 
documentation, in addition to interconnection agreements and cost 
certification reports, is readily available for a taxpayer to 
demonstrate that they have paid or incurred interconnection costs in 
the context of the section 48 credit. Taxpayers must retain 
documentation in compliance with section 6001. The proposed regulations 
do not provide any specific type of required documentation, and any 
documentation that satisfies section 6001 will suffice to substantiate 
that a taxpayer has paid or incurred qualified interconnection costs. 
Commenters to Notice 2022-49 provided feedback on the documentation 
that taxpayers may use to substantiate costs paid or incurred for 
qualified interconnection property in the context of

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Indexed from Federal Register on June 3, 2024.

This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.