Final Determination Regarding Energy Efficiency Improvements in ANSI/ASHRAE/IES Standard 90.1-2019, 40543-40548 [2021-15971]

Agencies

• DEPARTMENT OF ENERGY

[Federal Register Volume 86, Number 142 (Wednesday, July 28, 2021)]
[Notices]
[Pages 40543-40548]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2021-15971]



[[Page 40543]]

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DEPARTMENT OF ENERGY

[EERE-2020-BT-DET-0017]


Final Determination Regarding Energy Efficiency Improvements in 
ANSI/ASHRAE/IES Standard 90.1-2019

AGENCY: Office of Energy Efficiency and Renewable Energy, Department of 
Energy.

ACTION: Notification of determination.

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SUMMARY: The U.S. Department of Energy (DOE) has reviewed ANSI/ASHRAE/
IES Standard 90.1-2019: Energy Standard for Buildings, Except Low-Rise 
Residential Buildings and determined the updated edition would improve 
energy efficiency in commercial buildings subject to the code. DOE 
analysis indicates that buildings meeting Standard 90.1-2019, as 
compared with buildings meeting the 2016 edition, would result in 
national site energy savings of 4.7 percent, source energy savings of 
4.3 percent, and energy cost savings of approximately 4.3 percent of 
commercial building energy consumption. Upon publication of this 
affirmative determination, each State is required to review the 
provisions of their commercial building code regarding energy 
efficiency, and, as necessary, update their codes to meet or exceed 
Standard 90.1-2019. Additionally, this notice provides guidance on 
state code review processes and associated certifications.

DATES: Certification statements provided by States shall be submitted 
by July 28, 2023.

ADDRESSES: A copy of the supporting analysis, as well as links to the 
Federal docket and public comments received, are available at: https://www.energycodes.gov/development/determinations.
    Certification Statements must be addressed to the Building 
Technologies Office--Building Energy Codes Program Manager, U.S. 
Department of Energy, Office of Energy Efficiency and Renewable Energy, 
1000 Independence Avenue SW, EE-5B, Washington, DC 20585.

FOR FURTHER INFORMATION CONTACT: 
    Jeremiah Williams; U.S. Department of Energy, Office of Energy 
Efficiency and Renewable Energy, 1000 Independence Avenue SW, EE-5B, 
Washington, DC 20585; (202) 441-1288; [email protected].
    For legal issues, please contact Matthew Ring; U.S. Department of 
Energy, Office of the General Counsel, 1000 Independence Avenue SW, GC-
33, Washington, DC 20585; (202) 586-2555; [email protected].

SUPPLEMENTARY INFORMATION:

I. Background
II. Public Participation
III. Determination Statement
IV. State Certification

I. Background

    Title III of the Energy Conservation and Production Act, as amended 
(ECPA), establishes requirements for DOE to review consensus-based 
building energy conservation standards. (42 U.S.C. 6831 et seq.) 
Section 304(b), as amended, of ECPA provides that whenever the ANSI/
ASHRAE/IESNA \1\ Standard 90.1-1989 (Standard 90.1-1989 or 1989 
edition), or any successor to that code, is revised, the Secretary of 
Energy (Secretary) must make a determination, not later than 12 months 
after such revision, whether the revised code would improve energy 
efficiency in commercial buildings, and must publish notice of such 
determination in the Federal Register. (42 U.S.C. 6833(b)(2)(A)) If the 
Secretary makes an affirmative determination, within two years of the 
publication of the determination, each State is required to certify 
that it has reviewed and updated the provisions of its commercial 
building code regarding energy efficiency with respect to the revised 
or successor code and include in its certification a demonstration that 
the provisions of its commercial building code, regarding energy 
efficiency, meet or exceed the revised Standard. (42 U.S.C. 
6833(b)(2)(B)(i)) Standard 90.1-2019, the most recent edition, was 
published in October 2019, triggering the statutorily required DOE 
review process. The Standard is developed under ANSI-approved consensus 
procedures,\2\ and is under continuous maintenance under the purview of 
an ASHRAE Standing Standard Project Committee (commonly referenced as 
SSPC 90.1). ASHRAE has an established program for regular publication 
of addenda, or revisions, including procedures for timely, documented, 
consensus action on requested changes to the Standard. More information 
on the consensus process and ANSI/ASHRAE/IES Standard 90.1-2019 is 
available at https://www.ashrae.org/technical-resources/bookstore/standard-90-1.
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    \1\ ANSI--American National Standards Institute; ASHRAE--
American Society of Heating, Refrigerating, and Air-Conditioning 
Engineers; IES--Illuminating Engineering Society.
    \2\ See https://www.ansi.org/american-national-standards/info-for-standards-developers/standards-developers.
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    In addition, on January 20, 2021, the President issued Executive 
Order 13990, ``Protecting Public Health and the Environment and 
Restoring Science to Tackle the Climate Crisis.'' 86 FR 7037 (Jan. 25, 
2021). The Executive Order directed DOE to consider publishing for 
notice and comment a proposed rule suspending, revising, or rescinding 
the final technical determination regarding the ASHRAE Standard 90.1-
2016 by May 2021. Id. at 86 FR 7038. In response, DOE has reviewed the 
current Standard 90.1-2019 so that DOE's determination under section 
304(b) of ECPA reflects the most recent version of Standard 90.1, and 
to facilitate State and local adoption of the Standard, which will 
improve energy efficiency in the nation's commercial buildings.
    To meet the statutory requirement, and to satisfy the directive 
issued under Executive Order 13990, DOE issued a preliminary 
determination and published supporting analysis to quantify the 
expected energy savings associated with Standard 90.1-2019 relative to 
the previous 2016 version. The preliminary determination and analysis 
are available at: https://www.regulations.gov/document/EERE-2020-BT-DET-0017-0001.

II. Public Participation

    In an April 21, 2021 Federal Register notice, DOE requested public 
comments on its preliminary analysis of Standard 90.1-2019. (82 FR 
34513) DOE received eight public comments, all of which DOE considered 
in arriving at its final determination. DOE has now issued the final 
analysis of the expected energy savings associated with Standard 90.1-
2019 as compared to Standard 90.1-2016. A summary of public comments 
received, and DOE responses, is included in Appendix A of this Notice. 
The final analysis is available at: https://www.energycodes.gov/development/determinations.

III. Determination Statement

    Commercial buildings meeting Standard 90.1-2019 (compared to the 
previous 2016 edition) are expected to result in the following savings 
on a weighted national average basis:

 4.7 percent site energy savings
 4.3 percent source energy savings
 4.3 percent energy cost savings

    DOE has rendered the conclusion that Standard 90.1-2019 will 
improve energy efficiency in commercial buildings, and, therefore, 
receives an affirmative determination under Section 304(a) of ECPA. 
States can experience significant benefits by updating their codes to 
reflect current construction

[[Page 40544]]

standards, a total estimated $63.80 billion in energy cost savings and 
476.77 MMT of avoided CO2 emissions in commercial buildings 
(cumulative 2010 through 2040), or $2.80 billion in annual energy cost 
savings and 21.16 MMT in annual avoided CO2 emissions 
(annually by 2030). These benefits, including emissions reductions, are 
estimated in a revised 2021 interim report addressing building code 
impacts.\3\ Though not quantified in the interim report, there may also 
be costs to regulated entities as a result of updated commercial 
building codes.
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    \3\ See https://www.pnnl.gov/main/publications/external/technical_reports/PNNL-31437.pdf for the 2021 interim code impact 
report. Financial benefits are calculated by applying historical and 
future fuel prices to site energy savings and by discounting future 
savings to 2020 dollars. Historical and future real fuel prices are 
obtained through EIA's AEO 2015 report (EIA 2015).
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IV. State Certification

    Upon publication of this affirmative determination, each State is 
required to review and update, as necessary, the provisions of its 
commercial building energy code to meet or exceed the provisions of the 
2019 edition of Standard 90.1. (42 U.S.C. 6833(b)(2)(B)(i)) This action 
is required not later than 2 years from the date the final Notice of 
Determination is published in the Federal Register, unless an extension 
is provided.

State Review & Update

    DOE recognizes that some States do not have a State commercial 
building energy code, or have a State code that does not apply to all 
commercial buildings. States may base their certifications on 
reasonable actions by units of general-purpose local government. Each 
such State must review the information obtained from the local 
governments, and gather any additional data and testimony in preparing 
its own certification.
    The applicability of any State revisions to new or existing 
buildings would be governed by the State building codes. States should 
be aware that the scope of Standard 90.1 includes high-rise (greater 
than three stories) multi-family residential buildings, and hotels, 
motels, and other transient residential building types of any height, 
as commercial buildings for energy code purposes. Consequently, 
commercial buildings, for the purposes of certification to DOE, would 
include high-rise multi-family residential buildings, hotels, motels, 
and other transient residential building types of any height.

State Certification Statements

    Section 304(b) of ECPA, as amended, requires each State to certify 
to the Secretary of Energy that it has reviewed and updated the 
provisions of its commercial building energy code regarding energy 
efficiency to meet or exceed the Standard 90.1-2019. (42 U.S.C. 
6833(b)) The certification must include a demonstration that the 
provisions of the State's commercial building energy code regarding 
energy efficiency meets or exceeds Standard 90.1-2019. If a State 
intends to certify that its commercial building energy code already 
meets or exceeds the requirements of Standard 90.1-2019, the State 
should provide an explanation of the basis for this certification 
(e.g., Standard 90.1-2019 is incorporated by reference in the State's 
building code regulations). The chief executive of the State (e.g., the 
governor), or a designated State official (e.g., director of the State 
energy office, State code commission, utility commission, or equivalent 
State agency having primary responsibility for commercial building 
energy codes), would provide the certification to the Secretary. Such a 
designated State official would also provide the certifications 
regarding the codes of units of general purpose local government based 
on information provided by responsible local officials.
    The DOE Building Energy Codes Program tracks and reports State code 
adoption and certification.\4\ Once a State has adopted a new 
commercial energy code, DOE typically provides software, training, and 
support for the new code as long as the new code is based on the 
national model code (i.e., ASHRAE Standard 90.1-2019). DOE has issued 
previous guidance on how it intends to respond to technical assistance 
requests related to implementation resources, such as building energy 
code compliance software. (79 FR 15112) DOE Secretary is required to 
provide incentive funding to States to implement the requirements of 
section 304, and to improve and implement State residential and 
commercial building energy efficiency codes, including increasing and 
verifying compliance with such codes. (See 42 U.S.C. 6833(e)) Some 
States develop their own codes that are only loosely related to the 
national model codes, and DOE may not be able to provide technical 
support for those codes. DOE does not prescribe how each State adopts 
and enforces its energy codes.
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    \4\ Available at https://www.energycodes.gov/adoption/states.
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Requests for Extensions

    Section 304(c) of ECPA requires that the Secretary permit an 
extension of the deadline for complying with the certification 
requirements described previously, if a State can demonstrate that it 
has made a good faith effort to comply with such requirements and that 
it has made significant progress toward meeting its certification 
obligations. (42 U.S.C. 6833(c)) Such demonstrations could include one 
or both of the following: (1) A plan for response to the requirements 
stated in Section 304; or (2) a statement that the State has 
appropriated or requested funds (within State funding procedures) to 
implement a plan that would respond to the requirements of Section 304 
of ECPA. This list is not exhaustive. Requests are to be sent to the 
address provided in the ADDRESSES section, or may be submitted to 
[email protected].

Appendix A

    DOE received comments on its preliminary determination and 
supporting analysis of Standard 90.1-2019 from the following 
stakeholders:

 U.S. Army
 U.S. Air Force
 Responsible Energy Codes Alliance (RECA)
 Edison Electric Institute (EEI)
 Air-Conditioning, Heating, and Refrigeration Institute 
(AHRI)
 Three individual commenters

    The comments are summarized below and are available at: https://www.regulations.gov/document/EERE-2020-BT-DET-0017-0001/comment. DOE 
responded to all comments received. Several issues raised by 
commenters are distinct from the energy efficiency analysis DOE has 
undertaken pursuant to its statutory obligations. These include the 
social cost of carbon, life-cycle cost, and cost effectiveness; 
among these issues, social cost of carbon garnered the most 
attention from commenters and is therefore emphasized in the 
responses below.
    Comment: The anonymous submitter of comment ID EERE-2020-BT-DET-
0017-0002 stated that the reduction in emissions is low for a five-
year code cycle and the standards should be stricter.
    DOE response: DOE notes that the reported savings estimates 
represent a 3-year code cycle--Standard 90.1-2019 compared to the 
2016 edition--and not 5 years as stated by the commenter. The 
stringency of each version of 90.1 is determined by the ANSI 
consensus process used to revise Standard 90.1, as administered by 
ASHRAE. While DOE is directed to participate in the ASHRAE consensus 
process, the Department holds no special status. DOE's role in code 
review and consensus processes for commercial energy codes, 
including Standard 90.1, is further described at https://www.energycodes.gov/development/commercial/codes.
    Comment: The U.S. Army stated that some of the requirements are 
not ``reasonable'' or ``practicable'' and that requirements should

[[Page 40545]]

be operable and maintainable with typical maintenance staff and 
budgets.
    DOE response: DOE notes that, in making its determination, its 
directive under ECPA is to assess whether updated editions of 
Standard 90.1 would improve energy efficiency in commercial 
buildings. DOE believes that the issue of whether code provisions 
are ``reasonable'' and ``practicable'' is complex and most 
appropriately addressed directly by the established code development 
process, as administered by ASHRAE, used for Standard 90.1. That 
process is inclusive of a wide range and variety of stakeholders, 
and features a robust public comment process to ensure that the 
concepts evaluated for inclusion in new versions of Standard 90.1 
are indeed reasonable, practicable, feasible and cost effective, 
among many other considerations.
    Comment: The anonymous submitter of comment ID EERE-2020-BT-DET-
0017-0004 asked, for buildings that are already using 100% renewable 
energy, whether the source energy and CO2 savings are 
going to be zero.
    DOE response: DOE's determination is focused on a typical new 
building meeting the minimum requirements of ASHRAE Standard 90.1-
2019. A building that is using 100% renewable energy was not 
contemplated in DOE's analysis.
    Comment: The anonymous submitter of comment ID EERE-2020-BT-DET-
0017-0005 asked why DOE shows building-only savings for natural gas 
and building plus upstream savings for electricity. The commenter 
suggested DOE should account for regional variations in gas and 
electricity production.
    DOE response: Both gas and electricity savings are expressed as 
both site energy and source energy. The source energy factors for 
natural gas and electricity are shown on pages 16 and 17 of the 
technical support document referenced in the preliminary 
determination notice. The source energy emissions for electricity 
include both the losses in terms of generation as well as losses in 
transmission and distribution. For natural gas, the source energy 
factor of 1.088 includes losses due to both pipeline leakage and 
transmission energy (compression) and the derivations are documented 
in the technical support document. Regarding regional variation in 
production, DOE considers use of national assumptions for gas and 
electricity production the most appropriate way to estimate the 
national energy impact of one edition of a model standard compared 
to the previous edition, which is consistent with DOE's directive 
under ECPA.
    Comment: The U.S. Air Force's first comment stated that the 
determination does not address institutional, industrial, or campus 
buildings that often have mass walls and reduced window area.
    DOE response: The suite of prototype building models relied upon 
by the Standard 90.1 development committee and applied in DOE's 
analysis of ASHRAE Standard 90.1-2019 represents approximately 76% 
of U.S. new non-residential construction volume and includes mass 
walls, steel framed, metal building, and wood frame construction. 
Window-to-wall ratio varies in these models from 1% to 40%, as is 
commonly the case in the commercial building stock, as represented 
by the prototype models. While the prototypes cannot address every 
possible combination of building type and building construction 
types in the analysis, they do include a representative range of 
building construction types, and are relied upon by established 
decision-making processes, including the Standard 90.1 development 
process.
    Comment: The U.S. Air Force also recommended that the life-cycle 
cost analysis (LCCA) should not use U.S. average utility rates.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) With respect to the energy cost savings calculation, 
DOE considers use of a national average utility rate the most 
appropriate way to estimate the national energy cost savings of one 
edition of a model energy standard compared to the previous edition, 
which is consistent with DOE's directive under ECPA. The range of 
utility tariffs available in the U.S. numbers in the thousands, and 
DOE is ultimately charged with issuing a national determination. DOE 
notes that it does apply more specific rates in other analyses, 
where appropriate, such as in estimating energy code impacts at the 
state level.
    Comment: The U.S. Air Force's final comment stated it does not 
appear that maintenance tail expenses for mechanical requirements 
such as enthalpy wheels were incorporated into the LCCA.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) Concepts such as life-cycle cost and cost 
effectiveness represent economic analysis and are distinct from the 
energy efficiency analysis that DOE is directed to assess through 
its determination. However, DOE recognizes the value of such 
analysis in informing state and local decisions surrounding code 
review and update processes, as well as design decisions associated 
with specific buildings and systems. DOE provides a variety of 
additional analysis, including cost-effectiveness analysis, outside 
the scope of DOE's determination, and in response to the 
Department's separate directive to provide technical assistance to 
support state code implementation. When conducting analysis such as 
cost-effectiveness analysis, DOE does indeed rely upon a life-cycle 
perspective and accounts for costs associated with the maintenance 
and replacement of building systems and components.
    Comment: RECA's first comment recommended that DOE provide 
technical support for Standard 90.1.
    DOE response: DOE is directed under ECPA to provide technical 
assistance supporting the implementation of building energy codes. 
Consistent with this directive, DOE intends to continue providing 
robust technical assistance supporting state and local 
implementation of buildings energy codes. DOE recognizes the 
importance of supporting the states and local governments who 
ultimately adopt and implement codes, as well as the wide range of 
industry stakeholders who rely upon energy codes and strive to 
achieve compliance in practice.
    Comment: RECA's second comment recommended that DOE provide 
cost-effectiveness analysis.
    DOE response: As outlined in previous responses, DOE notes that 
the current determination is focused solely on whether the revised 
Standard would improve energy efficiency in commercial buildings. 
However, DOE recognizes the value of additional forms of technical 
analysis supporting building energy codes to support the 
implementation of state building energy codes (42 U.S.C. 6833(d)), 
and intends to continue to provide both national and state-level 
cost-effectiveness analysis of Standard 90.1-2019 in the future.
    Comment: RECA's third comment recommended that DOE provide 
state-level energy and cost analyses.
    DOE response: Consistent with the previous comment response, DOE 
intends to provide state-level energy and cost analyses in the 
future.
    Comment: RECA's fourth comment recommended that DOE compare 
90.1-2019 to the 2021 IECC.
    DOE response: DOE recognizes that adopting states and local 
governments often review the commercial provisions of the 
International Energy Conservation Code (IECC), and can benefit from 
knowing how the IECC compares to Standard 90.1 (i.e., the model 
energy code established under ECPA). DOE has provided such analysis 
in the past and intends to prepare similar analysis in the future.
    Comment: RECA's fifth comment recommended that DOE remove old 
versions of Standard 90.1 from COMcheck.
    DOE response: In maintaining its compliance resources, such as 
the COMcheck software \5\, DOE typically supports the three most 
recent editions of the model codes. (79 FR 15112) Following the 
current determination, and in accordance with established DOE 
policy, this will include the 2019, 2016 and 2013 editions of 
Standard 90.1, which represents the range of recent code editions, 
and helps ensure limited federal resources remain focused on the 
latest model codes. DOE intends to maintain consistency with this 
approach.
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    \5\ COMcheck is a software tool developed and maintained by DOE 
for the purpose of verifying compliance in commercial buildings. 
Learn more at https://www.energycodes.gov/comcheck.
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    Comment: RECA's sixth comment recommended that DOE provide 
implementation support for 90.1-2019.
    DOE response: Consistent with previous comment responses, DOE 
intends to continue providing robust support for states and local 
governments implementing building energy codes. DOE notes that 
several resources, including training on Standard 90.1-2019, are 
already available via the DOE Building

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Energy Codes Program technical assistance website, https://www.energycodes.gov. DOE intends to provide additional resources 
supporting Standard 90.1 implementation in the future.
    Comment: RECA's seventh comment recommended that DOE find new 
opportunities to support model code adoption, compliance, and 
enforcement.
    DOE response: DOE appreciates RECA's support in seeking new 
opportunities to support code adoption and implementation. DOE 
intends to continue to explore new and innovative means of 
supporting code implementation and welcomes additional suggestions 
in this area.
    Comment: RECA's eighth comment stated that RECA agrees with and 
supports DOE's positive determination.
    DOE response: DOE appreciates the support.
    Comment: EEI's first comment stated that the EPA greenhouse gas 
equivalencies calculator overstates the emissions impact.
    DOE response: As outlined in previous responses, DOE notes that 
the current determination is focused solely on whether the revised 
Standard would improve energy efficiency in commercial buildings. 
However, DOE recognizes the value of additional forms of technical 
analysis supporting state implementation of building energy codes, 
including emissions analyses. DOE relies on greenhouse gas emission 
coefficients established by the Environmental Protection Agency 
(EPA) in estimating current year CO2 savings. EPA's 
emission coefficients are designed to reflect marginal 
CO2 savings from electricity savings occurring on the 
building site, which DOE considers appropriate for evaluating the 
carbon savings stemming from an improved energy standard. This 
approach is consistent with how DOE has performed similar 
calculations in previous determinations.
    Comment: EEI's second comment recommended that DOE's 
determination should take into account the commitments utilities 
have made to reduce carbon emissions.
    DOE response: As outlined in previous responses, DOE notes that 
the current determination is focused solely on whether the revised 
Standard would improve energy efficiency in commercial buildings. 
However, DOE recognizes the value of additional forms of technical 
analysis supporting state implementation of building energy codes, 
including emissions analyses. DOE's analysis is based on several 
metrics--energy cost, site energy, source energy--and in addition 
reports the corresponding carbon emissions on a first-year basis. 
DOE recognizes the progress being made by utilities in decarbonizing 
the electric grid, and emphasizes that estimates provided in the 
supporting technical analysis are based on current emission levels 
and are subject to change in the future.
    Comment: AHRI, p. 2-5. AHRI commented that historically DOE did 
not estimate emission reductions or apply a value to emission 
reductions as part of the results and basis for the determination. 
They further stated that including emission reductions or their 
value, including the SCC, as part of the basis for determination was 
outside DOE's authority to consider (42 U.S.C. 6833(b)(2)(A)), 
because EPCA is an energy conservation statute and excludes 
environmental objectives (see 42 U.S.C. 6312 which excludes 
environmental objectives), and that DOE does not have the statutory 
authority to consider greenhouse gas estimates in determinations 
regarding commercial building codes. AHRI opined that the SCC should 
only be included for rulemakings where DOE has clear statutory 
authority to do so and stated that it lacks such statutory authority 
as to building energy codes.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) DOE emphasizes that the estimates pertaining to 
CO2 are provided only as supplemental information and are 
not considered as part of the final determination, which is based on 
energy efficiency as required under 42 U.S.C. 6833(b)(2)(A). DOE's 
analysis includes an estimate of a one-year reduction in 
CO2 emissions on a normalized per square foot basis for 
buildings constructed to 90.1-2019 versus those constructed to 90.1-
2016. Climate benefits associated with the expected CO2 
emissions reductions are monetized using estimates of the social 
cost of carbon (SC-CO2) presented in the Technical 
Support Document: Social Cost of Carbon, Methane, and Nitrous Oxide 
Interim Estimates under Executive Order 13990 (``February 2021 
TSD'').\6\
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    \6\ For more information on DOE's use of the estimates from this 
document, please section 4.2 and 5 of the TSD for the final 
determination.
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    DOE has determined that the estimates from the February 2021 TSD 
are based upon sound analysis and provide well founded estimates for 
DOE's analysis of the impacts of CO2 related to the 
reductions of emissions from updating the 90.1 Standard to the 2019 
edition. However, DOE emphasizes that DOE is reporting estimates 
related to CO2 only because information on the carbon 
emissions associated with buildings are valued by many stakeholders, 
including states and local governments who ultimately implement 
building codes, and who have expressed a need for this information. 
These estimates are not considered as part of DOE's ultimate 
determination of whether Standard 90.1-2019 will improve energy 
efficiency.
    Comment: AHRI, p. 2, 5. AHRI stated that DOE is ignoring clear 
Congressional intent in including emissions in the narrowly scoped 
building energy code review defined in the statutory text (42 U.S.C. 
6833(b)(1). It further stated that Congress could have added global 
climate change as a variable to weigh in the determination, but did 
not do so and so DOE should not include this in the determination.
    DOE response: See response to previous AHRI comment.
    Comment: AHRI, p. 2. AHRI requested that DOE remove carbon 
emissions from the determination for building energy codes, 
including ASHRAE 90.1-2019.
    DOE response: See previous response to AHRI comment.
    Comment: AHRI p. 2. Irrespective of the authority consideration, 
AHRI requested that DOE must act to remedy inaccurate assumptions 
and conclusions on the SC-CO2 benefits analysis. AHRI 
opined that the benefits claimed from full fuel cycle and global 
impact of emissions and SCC are speculative and tangential and that 
these are calculated over a time period (100 years) that greatly 
exceeds that used to measure economic costs.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A). DOE emphasizes that the estimates pertaining to 
CO2 are provided only as supplemental information and are 
not considered as part of the final determination, which is based on 
energy efficiency as required under 42 U.S.C. 6833(b)(2)(A).
    In calculating related CO2 impacts, DOE used the 
estimates for the SC-CO2 from February 2021 TSD. DOE has 
determined that the estimates from the February 2021 TSD, as 
described more below, are based upon sound analysis and provide well 
founded estimates for DOE's analysis of the impacts of 
CO2 related to the reductions of emissions from updating 
the 90.1 Standard to the 2019 edition. The SC-CO2 
estimates in the February 2021 TSD are interim values developed 
under Executive Order (E.O.) 13990 for use until an improved 
estimate of the impacts of climate change can be developed based on 
the best available science and economics. The SC-CO2 
estimates used in this analysis were developed over many years, 
using a transparent process, peer-reviewed methodologies, the best 
science available at the time of that process, and with input from 
the public. Specifically, an interagency working group (IWG) that 
included DOE, the EPA and other executive branch agencies and 
offices used three integrated assessment models (IAMs) to develop 
the SC-CO2 estimates and recommended four global values 
for use in regulatory analyses. Those estimates were subject to 
public comment in the context of dozens of proposed rulemakings as 
well as in a dedicated public comment period in 2013.
    The SC-CO2 estimates were first released in February 
2010 and updated in 2013 using new versions of each IAM. In 2015, as 
part of the response to public comments received to a 2013 
solicitation for comments on the SC-CO2 estimates, the 
IWG announced a National Academies of Sciences, Engineering, and 
Medicine review of the SC-CO2 estimates to offer advice 
on how to approach future updates to ensure that the estimates 
continue to reflect the best available science and methodologies. In 
January 2017, the National Academies released their final report, 
Valuing Climate Damages: Updating Estimation of the Social Cost of 
Carbon Dioxide, and recommended specific criteria for future updates 
to the SC-CO2 estimates, a modeling framework to satisfy 
the specified criteria, and both near-term updates and longer-term 
research needs pertaining to various components of the estimation 
process (National Academies 2017). On January 20, 2021, President 
Biden

[[Page 40547]]

issued Executive Order 13990, which directed the IWG to ensure that 
the U.S. Government's (USG) estimates of the SC-CO2 and 
other greenhouse gases reflect the best available science and the 
recommendations of the National Academies (2017). The IWG was tasked 
with first reviewing the estimates currently used by the USG and 
publishing interim estimates within 30 days of E.O. 13990 that 
reflect the full impact of GHG emissions, including taking global 
damages into account.\7\ The interim SC-CO2 estimates 
published in February 2021 are used here to estimate the climate 
benefits associated with this determination and related model 
building energy code updates.
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    \7\ The E.O. instructs the IWG to undertake a fuller update of 
the SC-GHG estimates by January 2022.
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    DOE acknowledges that there are a number of challenges in 
attempting to assess the incremental economic impacts of 
CO2 emissions. The science and economic understanding of 
climate change and its impacts is improving over time; research 
focused on the assessment of climate damages and socioeconomic 
emissions projections is particularly important for reducing 
uncertainty in the calculation of the social cost of greenhouse 
gases (SC-GHG),\8\ as is quantifying and being transparent about 
where key uncertainties in the models remain.\9\ But contrary to 
AHRI's suggestion that uncertainty should cause DOE to discount or 
abandon monetization of the social benefits of reducing 
CO2 emissions, as stated by the interagency working group 
(``IWG'') that performed the review described in the February 2021 
TSD, due to a number of sources of uncertainty, there is a 
likelihood that the social cost of greenhouse gases (SC-GHG) is an 
underestimate of the true social cost of emissions.\10\ Despite the 
limits of both quantification and monetization, SC-CO2 
estimates can be useful in estimating the social benefits of 
reducing CO2 emissions. As a result, DOE has used the 
IWG's SC-CO2 estimates in monetizing the social benefits 
of reducing CO2 emissions. However, as discussed in 
previous comments, DOE's SC-CO2 analysis using these 
estimates was not considered in DOE's ultimate determination of 
whether Standard 90.1-2019 will improve energy efficiency.
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    \8\ The social cost of greenhouse gases (SC-GHG) is the monetary 
value of the net harm to society associated with adding a small 
amount of that GHG to the atmosphere in a given year and, therefore, 
should reflect the societal value of reducing emissions of the gas 
in question by one metric ton. The marginal estimate of social costs 
will differ by the type of greenhouse gas (such as carbon dioxide, 
methane, and nitrous oxide) and by the year in which the emissions 
change occurs. The estimates of the social cost of carbon (SC-
CO2), social cost of methane (SC-CH4), and 
social cost of nitrous oxide (SC-N2O) published in the 
February 2021 TSD allow agencies to understand the social benefits 
of reducing emissions of each of these greenhouse gases, or the 
social costs of increasing such emissions, in the policy making 
process. Collectively, these values are referenced as the ``social 
cost of greenhouse gases'' (SC-GHG).
    \9\ National Academy of Sciences, Engineering, and Medicine, 
Valuing Climate Damages: Updating Estimation of the Social Cost of 
Carbon Dioxide, National Academies Press: Washington, DC, 2017.
    \10\ See Interagency Working Group on Social Cost of Greenhouse 
Gases, Technical Support Document: Social Cost of Carbon, Methane, 
and Nitrous Oxide. Interim Estimates Under Executive Order 13990, 
Washington, DC, February 2021.
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    Comment: AHRI p. 2, 3. As part of the rationale for not 
including SCC, AHRI further commented that DOE has acknowledged the 
uncertainty of SCC estimates and stated that these are both 
provisional and revisable. Further, they noted that the interagency 
working group developing the SCC noted that the underlying models 
were imperfect and incomplete and notes that the intergovernmental 
panel on climate change (IPCC) which the IWG relied on also stated 
in 2013 that no best estimate for equilibrium climate sensitivity 
could then be given because of the lack of agreement on values 
across assessed lines of evidence and studies.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) DOE emphasizes that the estimates pertaining to 
CO2 are provided only as supplemental information and are 
not considered as part of the final determination, which is based on 
energy efficiency as required under 42 U.S.C. 6833(b)(2)(A).
    As noted previously, DOE determined that the estimates from the 
February 2021 TSD are based upon sound analysis and provide well 
founded estimates for DOE's analysis of the impacts of 
CO2 related to the reductions of emissions from updating 
the 90.1 Standard to the 2019 edition. As explained in the February 
2021 TSD and while the IWG works to assess how best to incorporate 
the latest, peer reviewed science to develop an updated set of SC-
GHG estimates, the IWG has determined that it is appropriate for 
agencies to revert to the same set of four values drawn from the SC-
GHG distributions based on three discount rates as were used in 
regulatory analyses between 2010 and 2016 and subject to public 
comment. For each discount rate, the IWG combined the distributions 
across models and socioeconomic emissions scenarios (applying equal 
weight to each) and then selected a set of four values for use in 
benefit-cost analyses: An average value resulting from the model 
runs for each of three discount rates (2.5%, 3%, and 5%), plus a 
fourth value, selected as the 95th percentile of estimates based on 
a 3 percent discount rate. The fourth value was included to provide 
information on potentially higher-than-expected economic impacts 
from climate change, conditional on the 3% estimate of the discount 
rate. As explained in the February 2021 TSD, this update reflects 
the immediate need to have an operational SC-GHG for use in 
regulatory benefit-cost analyses and other applications that was 
developed using a transparent process, peer-reviewed methodologies, 
and the science available at the time of that process. Those 
estimates were subject to public comment in the context of dozens of 
proposed rulemakings as well as in a dedicated public comment period 
in 2013. However, as discussed in previous comments, DOE's SC-
CO2 analysis using these estimates was not considered in 
DOE's ultimate determination of whether Standard 90.1-2019 will 
improve energy efficiency.
    Comment: AHRI, p. 3,5. AHRI commented that EPCA's focus is on 
benefits accruing with this nation, hence incorporation of SCC at 
the global level is beyond the scope and authority of DOE. See 42 
U.S.C. 6833(b)(2)(B)(I). They further noted that EPCA originally 
arose out of the 1970's oil embargo and that nothing in the 
subsequent amendments suggests a different statutory focus other 
than improving the energy economics within the United States. AHRI 
notes that DOE analyzes expected national [domestic] energy savings, 
but does not scale back reported SCC calculations to reflect 
domestic impacts only.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) DOE emphasizes that the estimates pertaining to 
CO2 are provided only as supplemental information and are 
not considered as part of the final determination, which is based on 
energy efficiency as required under 42 U.S.C. 6833(b)(2)(A). As to 
the use of a SC-CO2 value that includes impacts outside 
the boundaries of the United States, the February 2021 TSD provides 
a complete discussion of the IWG's initial review conducted under 
E.O. 13990. In particular, the IWG found that a global perspective 
is essential for SC-GHG estimates because climate impacts occurring 
outside U.S. borders can directly and indirectly affect the welfare 
of U.S. citizens and residents. Thus, U.S. interests are affected by 
the climate impacts that occur outside U.S. borders. Examples of 
affected interests include: Direct effects on U.S. citizens and 
assets located abroad, international trade, and tourism, and 
spillover pathways such as economic and political destabilization 
and global migration. In addition, assessing the benefits of U.S. 
GHG mitigation activities requires consideration of how those 
actions may affect mitigation activities by other countries, as 
those international mitigation actions will provide a benefit to 
U.S. citizens and residents by mitigating climate impacts that 
affect U.S. citizens and residents.
    As noted previously, DOE determined that the estimates from the 
February 2021 TSD are based upon sound analysis, and therefore, in 
analyzing the impacts of CO2 related to the reductions of 
emissions from updating the 90.1 Standard to the 2019 edition, DOE 
has focused on a global measure of SC-GHG. As noted in the February 
2021 TSD, the IWG will continue to review developments in the 
literature, including more robust methodologies for estimating SC-
GHG values based on purely domestic damages, and explore ways to 
better inform the public of the full range of carbon impacts, both 
global and domestic. As a member of the IWG, DOE will likewise 
continue to follow developments in the literature pertaining to this 
issue. However, as discussed in previous comments, DOE's SC-
CO2 analysis using these estimates was not considered in 
DOE's ultimate determination of whether Standard 90.1-2019 will 
improve energy efficiency.
    Comment: AHRI, p.3,4. AHRI stated that DOE wrongly assumes that 
SCC values

[[Page 40548]]

increase over time in real dollars and states that this is contrary 
to ``historical experience and to economic development science'' and 
that the more economic development that occurs, the more adaptation 
and mitigation efforts a population living in a growing economy can 
afford to undertake (AHRI cites the IWG indicating that developed 
countries can eliminate 90% of the economic impacts and developing 
countries could eventually eliminate 50% of the economic impacts of 
climate change). They comment that they see no indication that DOE 
considered this separately.
    DOE response: In making its determination, DOE's directive under 
ECPA is to assess whether updated editions of Standard 90.1 would 
improve energy efficiency in commercial buildings. 42 U.S.C. 
6833(b)(2)(A) DOE emphasizes that the estimates pertaining to 
CO2 are provided only as supplemental information and are 
not considered as part of the final determination, which is based on 
energy efficiency as required under 42 U.S.C. 6833(b)(2)(A).
    The model scenarios reported by the IWG demonstrate that the 
damage assessments and corresponding valuation (SC-CO2), 
adjusted for inflation, increase through time. As explained in the 
February 2021 TSD, ``[the SC-GHG estimates increase over time within 
the models--i.e., the societal harm from one metric ton emitted in 
2030 is higher than the harm caused by one metric ton emitted in 
2025--because future emissions produce larger incremental damages as 
physical and economic systems become more stressed in response to 
greater climatic change, and because GDP is growing over time and 
many damage categories are modeled as proportional to GDP.'' As 
noted previously, DOE determined that the estimates from the 
February 2021 TSD are based upon sound analysis and provide well 
founded estimates for DOE's analysis of the impacts of 
CO2 related to the reductions of emissions from updating 
the 90.1 Standard to the 2019 edition in its building codes impact 
analysis. Accordingly, DOE incorporated the IWG's considerations in 
its analysis. However, as discussed in previous comments, DOE's SC-
CO2 analysis using these estimates was not considered in 
DOE's ultimate determination of whether Standard 90.1-2019 will 
improve energy efficiency.
    Comment: AHRI, p. 4. AHRI argued that it is arbitrary and 
capricious to use different timeframes and assumptions for costs and 
benefits and notes that DOE must clarify precisely why and how it 
believes it has statutory authority under 42 U.S.C. 6833(b) to 
consider SCC issues and cites why such action is legally arbitrary 
without sufficient documented reason for treating similar situations 
differently. AHRI notes that DOE, in clarifying why it believes it 
has such authority, can establish how it is acting consistently in 
terms of the analysis of benefits.
    DOE response: See previous response to AHRI comment on the issue 
of authority. On the issue of costs and benefits, DOE reemphasizes 
that its determination analysis is not assessing the costs and 
benefits associated with the updated Standard 90.1, that the 
determination is solely based on energy efficiency, and that the 
reported carbon emissions are reported only as supplemental 
information for the benefit of interested parties and in support of 
the directives of Executive Order 12866. To clarify the issue of 
timeframe, the emission estimates are based on a one-year time 
period (i.e., the annual energy consumption estimated via the energy 
efficiency analysis). However, the step of projecting the associated 
CO2 impacts captures the longer-term impact of those 
single-year emissions, as they persist in the atmosphere (and drive 
the damage impacts over the time they persist), which is then 
discounted to present value for the year when the emissions occur. 
DOE does not find an economic inconsistency in this approach to 
reporting emission benefits. Such a calculation is similar to life-
cycle analysis, for instance, which is performed in a similar 
fashion, where a single year event occurs (e.g., a purchase of more 
efficient equipment), but the energy savings are calculated over the 
time they exist (e.g., the life of the equipment), and discounted 
back to the present value to reflect an overall life-cycle cost. 
DOE's reporting here of discounted damage impacts is consistent with 
that general approach.

Signing Authority

    This document of the Department of Energy was signed on July 19, 
2021, by Kelly Speakes-Backman, Principal Deputy Assistant Secretary 
and Acting Assistant Secretary for Energy Efficiency and Renewable 
Energy, pursuant to delegated authority from the Secretary of Energy. 
That document with the original signature and date is maintained by 
DOE. For administrative purposes only, and in compliance with 
requirements of the Office of the Federal Register, the undersigned DOE 
Federal Register Liaison Officer has been authorized to sign and submit 
the document in electronic format for publication, as an official 
document of the Department of Energy. This administrative process in no 
way alters the legal effect of this document upon publication in the 
Federal Register.

    Signed in Washington, DC, on July 22, 2021.
Treena V. Garrett,
Federal Register Liaison Officer, U.S. Department of Energy.
[FR Doc. 2021-15971 Filed 7-27-21; 8:45 am]
BILLING CODE 6450-01-P