[Federal Register Volume 91, Number 135 (Thursday, July 16, 2026)]
[Rules and Regulations]
[Pages 43561-43569]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2026-14371]
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ENVIRONMENTAL PROTECTION AGENCY
40 CFR Part 60
[EPA-HQ-OAR-2024-0419; FRL-11542.1-02-OAR]
New Source Performance Standards Review for Stationary Combustion
Turbines and Stationary Gas Turbines; Correction
AGENCY: Environmental Protection Agency (EPA).
ACTION: Correcting amendments.
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SUMMARY: The U.S. Environmental Protection Agency (EPA) is making
corrections to the New Source Performance Standards Review for
Stationary Combustion Turbines and Stationary Gas Turbines final rule
(``Final NSPS Rule'') that published in the Federal Register (FR) on
January 15, 2026, and became effective on January 15, 2026. After
publication, the EPA identified inadvertent technical and typographical
errors in the Federal Register regulatory text and is correcting those
errors.
DATES: Effective on August 17, 2026.
ADDRESSES: The EPA established a docket for this action under Docket ID
No. EPA-HQ-OAR-2024-0419. The docket lists all documents at https://www.regulations.gov. Although listed, some information is not publicly
available, e.g., Confidential Business Information (CBI) or other
information whose disclosure is restricted by statute. The EPA does not
place certain other material, such as copyrighted material, on the
internet; this material is publicly available only as portable document
format (PDF) versions accessible only on EPA computers in the docket
office reading room. The public cannot download certain databases and
physical items from the docket but may request these items by
contacting the docket office at (202) 566-1744. The docket office has
10 business days to respond to such requests. With the exception of
such material, publicly available docket materials are available
electronically at https://www.regulations.gov or on EPA computers in
the docket office reading room at the EPA Docket Center, WJC West
Building, Room Number 3334, 1301 Constitution Ave. NW, Washington, DC.
The Public Reading Room hours of operation are 8:30 a.m. to 4:30 p.m.
Eastern Time (ET), Monday through Friday (except Federal holidays). The
telephone number for the Public Reading Room is (202) 566-1744, and the
telephone number for the EPA Docket Center is (202) 566-1742.
FOR FURTHER INFORMATION CONTACT: For information about this action,
contact U.S. EPA, Attn.: John Ashley, Industrial Processing and Power
Division (D243-02), 109 T.W. Alexander Drive, P.O. Box 12055, Research
Triangle Park, North Carolina 27711; telephone number: (919) 541-1458;
and email address: [email protected].
SUPPLEMENTARY INFORMATION: The EPA is correcting the Final NSPS Rule,
New Source Performance Standards Review for Stationary Combustion
Turbines and Stationary Gas Turbines, which was published in the
Federal Register at 91 FR 1910 on January 15, 2026. Following
publication of this document, the EPA identified inadvertent technical
and typographical errors in the regulatory text of new 40 Code of
Federal Regulations (CFR) part 60, subpart KKKKa (``Subpart KKKKa''),
as well as regulatory text amended by the Final NSPS Rule in existing
40 CFR part 60, subparts KKKK and GG (``Subpart KKKK'' and ``Subpart
GG,'' respectively).
With this action, the EPA is correcting the following errors in FR
Document Number (FR Doc) 2026-00677 and appearing at 91 FR 1910 in the
Federal Register of January 15, 2026:
At 91 FR 1975, third column, 40 CFR part 60, subpart GG.
Final NSPS Rule instruction 3 amended Sec. 60.330 by revising
paragraph (a) and adding paragraphs (c) through (e). The EPA corrects
the regulatory text in paragraph (e) to read as being applicable to a
``gas turbine'' instead of a ``combustion turbine.'' The EPA is making
this correction for consistency with Subpart GG, which applies to the
stationary gas turbines source category.
At 91 FR 1978, third column, 40 CFR part 60, subpart KKKK.
Final NSPS Rule instruction 9 amended Sec. 60.4305 by revising
paragraphs (a) and (b) and adding paragraphs (c) through (e). The EPA
corrects the regulatory text in paragraph (e) to read as being
applicable to ``combustion turbines'' instead of ``stationary gas
turbines.'' The EPA is making this correction for consistency with
Subpart KKKK, which applies to the stationary combustion turbines
source category. In addition, the EPA removes the word ``stationary''
from the same phrase in paragraph (e) because turbines subject to title
II of the Clean Air Act (CAA) are not stationary sources.
At 91 FR 1979, second column, 40 CFR part 60, subpart
KKKK. Final NSPS Rule instruction 14 added Sec. 60.4331. In Sec.
60.4331 paragraphs (a) through (e), the EPA listed the requirements for
operating a stationary temporary combustion turbine. The EPA corrects
paragraph (a) to add the phrases ``owners or operators of'' and ``may
elect to be a temporary combustion turbine and'' in the first sentence.
These additions are necessary to clarify that the stationary temporary
combustion turbine subcategory is optional for qualifying combustion
turbines. Furthermore, the EPA adds the phrase ``as an alternative to
the otherwise applicable emission standards and monitoring,
recordkeeping, and
[[Page 43562]]
reporting requirements of this subpart'' to the end of paragraph (a) to
clarify that only those that elect to own or operate a stationary
temporary combustion turbine must comply with the requirements in
paragraphs (b) through (e) of this section. As conforming edits, the
EPA deletes the phrases ``you may operate,'' ``so long as you,'' and
``all of'' from paragraph (a). In paragraph (c) introductory text and
paragraph (d), the EPA deletes the phrase ``Unless you elect to
demonstrate compliance through the otherwise applicable monitoring,
recordkeeping, and reporting requirements of this subpart'' because
this notice adds that phrase to paragraph (a). The EPA adds the word
``combustion'' before ``turbine'' in the first sentence of paragraph
(e)(1) for consistency.
At 91 FR 1982, third column, 40 CFR part 60, subpart KKKK.
Final NSPS Rule instruction 23 amended Sec. 60.4380 by revising
paragraph (b)(3). The EPA corrects the regulatory text in paragraph
(b)(3) to reflect the use of an arithmetic average to determine the
applicable nitrogen oxide (NOX) standard for averaging
periods during which multiple NOX emission standards apply.
The Final NSPS Rule inadvertently incorporated regulatory text from
Subpart KKKKa that specified the use of a heat input weighted average.
At 91 FR 1982, third column, 40 CFR part 60, subpart KKKK.
Final NSPS Rule instruction 24 amended Sec. 60.4395 by revising the
introductory text. The EPA corrects the heading of this section to read
``When must I submit my reports?'' instead of ``What must I submit my
reports?''
At 91 FR 1984, third column, 40 CFR part 60, subpart KKKK.
Final NSPS Rule instruction 28 amended Sec. 60.4420 by adding and
revising certain definitions. The EPA is making an editorial change to
the last sentence of the ``stationary combustion turbine'' definition.
The EPA adds the word ``combustion'' before the word ``turbine'' for
consistency and moves the phrase ``all related requirements'' to before
the phrase ``promulgated pursuant to title II of the Clean Air Act''
for grammatical correctness.
At 91 FR 1985, table 1, second column, 40 CFR part 60,
subpart KKKK. Final NSPS Rule instruction 29 amended Table 1 to Subpart
KKKK of Part 60--Nitrogen Oxide Emission Limits for New Stationary
Combustion Turbines. In the second column of the table, ``Combustion
turbine heat input at peak load (HHV),'' the EPA amended the threshold
for the subcategories of ``Turbines located north of the Arctic Circle
(latitude 66.5 degrees north), turbines operating at less than 75
percent of peak load, modified and reconstructed offshore turbines, and
turbines operating at temperatures less than 0 [deg]F.'' Specifically,
the EPA amended the size threshold for these subcategories by including
a heat input-based threshold of 300 million British thermal units per
hour (MMBtu/h) in addition to the existing 30 megawatts (MW) output-
based threshold. The EPA is making a technical correction to revert to
the 30 MW output-based threshold in Subpart KKKKa. As a conforming edit
and for consistency across the subparts, the EPA revises table 1 of
Subpart KKKK by reverting to the previous output-based threshold of 30
MW alone for these subcategories of turbines. Because the EPA retained
the 30 MW metric as part of the size threshold in Subpart KKKK in the
Final NSPS Rule, this change in Subpart KKKK has no practical effect.
All combustion turbines with outputs greater than 30 MW also have base
load ratings of greater than 300 MMBtu/h, so the added 300 MMBtu/h
metric had no applicability implications.
At 91 FR 1985, table 1, first column, 40 CFR part 60,
subpart KKKK. Final NSPS Rule instruction 29 amended Table 1 to Subpart
KKKK of Part 60--Nitrogen Oxide Emission Limits for New Stationary
Combustion Turbines. In the last row of the table, the EPA added a
subcategory for ``Combustion turbines bypassing the heat recovery
unit.'' The EPA adds the phrase ``firing natural gas'' to the first
column of this row. The EPA is making this correction for consistency
with the previous applicable emission standards for units firing non-
natural gas fuels in Subpart KKKK. The EPA restores those previous
emission standards in Subpart KKKK by clarifying that this
subcategory's NOX emission standard applies only to units
firing natural gas.
At 91 FR 1985, table 1, first column, 40 CFR part 60,
subpart KKKK. Final NSPS Rule instruction 29 amended Table 1 to Subpart
KKKK of Part 60--Nitrogen Oxide Emission Limits for New Stationary
Combustion Turbines. The EPA corrects an omission from the table and
lists subcategories for stationary temporary combustion turbines firing
natural gas and firing fuels other than natural gas. These additional
rows at the end of the table include the associated NOX
emission standards for these subcategories, consistent with the
discussion in the preamble at 91 FR 1925. The Final NSPS Rule
inadvertently omitted these rows.
At 91 FR 1986, second column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4310a paragraph (d), the EPA
identified ``stationary gas turbines'' as not being subject to this
subpart if they are subject to title II of the CAA. The EPA corrects
paragraph (d) to read as being applicable to ``combustion turbines''
instead of ``stationary gas turbines.'' The EPA is making this
correction for consistency with Subpart KKKKa, which applies to the
stationary combustion turbines source category. In addition, the EPA
removes the word ``stationary'' from the same phrase in paragraph (d)
because turbines subject to title II of the CAA are not stationary
sources.
At 91 FR 1987, third column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4331a paragraphs (a) through
(e), the EPA listed the requirements for operating a stationary
temporary combustion turbine. The EPA corrects paragraph (a) to add the
phrases ``owners or operators of'' and ``may elect to be a temporary
combustion turbine and'' in the first sentence. This addition is
necessary to clarify that the stationary temporary combustion turbine
subcategory is optional for qualifying combustion turbines.
Furthermore, the EPA adds the phrase ``as an alternative to the
otherwise applicable emission standards and monitoring, recordkeeping,
and reporting requirements of this subpart'' to the end of paragraph
(a) to clarify that only those that elect to own or operate a
stationary temporary combustion turbine must comply with the
requirements in paragraphs (b) through (e) of this section. As
conforming edits, the EPA deletes the phrases ``you may operate,'' ``so
long as you,'' and ``all of'' from paragraph (a). In paragraph (c)
introductory text and paragraph (d), the EPA deletes the phrase
``Unless you elect to demonstrate compliance through the otherwise
applicable monitoring, recordkeeping, and reporting requirements of
this subpart'' because this notice adds that phrase to paragraph (a).
The EPA adds the word ``combustion'' before ``turbine'' in the first
sentence of paragraph (e)(1) for consistency.
At 91 FR 1988, second column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4333a paragraph (b)(1), the
EPA listed the general requirements for complying with the
NOX emission standards. In paragraph (b)(1), the EPA
corrects the stated interval between performance
[[Page 43563]]
tests to 14-calendar-months instead of 12-calendar-months. The EPA is
making this correction to align performance testing requirements in
paragraph (b)(1) with the Agency's response to public comments, which
states, ``The language in 40 CFR 60.4333a(b) has been updated to be
consistent with the 14- and 26-calendar-month testing gaps prescribed
in subpart KKKK.'' \1\
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\1\ See the document ``Summary of Public Comments and Responses:
Review of New Source Performance Standards for Stationary Combustion
Turbines and Stationary Gas Turbines,'' Section 8.5.2 Continuous
emission monitoring, available in the docket (EPA Docket ID No. EPA-
HQ-OAR-2024-0419) for this rulemaking at https://www.regulations.gov.
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At 91 FR 1989, first column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4333a paragraph (d)(3), the
EPA listed the methods that an owner or operator of a stationary
combustion turbine must use to demonstrate compliance with a sulfur
dioxide (SO2) emission standard. The Final NSPS Rule
inadvertently omitted a reference to Sec. 60.4372a, which contains the
additional acceptable method of using fuel records of the total sulfur
content for the combusted fuel to demonstrate compliance. The EPA
corrects the last sentence of Sec. 60.4333a paragraph (d)(3) by adding
a reference to Sec. 60.4372a to clarify--consistent with the intent of
the Final NSPS Rule--that maintaining records is an option for
demonstrating compliance with the applicable SO2 emission
standard.
At 91 FR 1991, third column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4350a, the EPA listed
instructions for determining excess NOX emissions using
continuous emission monitoring system (CEMS) data. In Sec. 60.4350a
paragraph (d), the EPA explained the proper procedure for estimating
emissions for hours with missing data. The EPA adds the phrase ``of
this chapter'' after ``part 75'' in the first sentence of paragraph (d)
for consistency. In addition, the EPA replaces the phrase ``of the hour
of'' in the second sentence with ``of the hourly load value of'' after
`` 10 percent.'' The EPA is making this change to clarify
the proper procedure for estimating emissions.
At 91 FR 1992, third column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4350a paragraph (f)(1), the
EPA provided equation 1 for calculating the hourly average
NOX emissions rate, including a list that defines the
variables used in the equation. For variable T, the second sentence
describes a calculation that ``consists of useful thermal output on an
annual basis.'' The EPA corrects this description to clarify that
variable T ``consists of useful thermal output on a 12-calendar-month
basis'' instead of an ``annual'' basis, which could be confused with
calendar-years. The EPA is making this change for consistency with the
intent of the Final NSPS Rule, which bases emissions standards on a 12-
calendar-month rolling average.
At 91 FR 1995, third column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4374a paragraph (g)(2), the
EPA provided equation 2 for calculating the hourly average
NOX emissions rate, including a list that defines the
variables used in the equation. For variable T, the second sentence
describes a calculation that ``consists of useful thermal output on an
annual basis.'' The EPA corrects this description to clarify that
variable T ``consists of useful thermal output on a 12-calendar-month
basis'' instead of an ``annual'' basis, which could be confused with
calendar-years. The EPA is making this change for consistency with the
intent of Final NSPS Rule, which bases emissions standards on a 12-
calendar-month rolling average.
At 91 FR 2000, first column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4400a, the EPA listed
instructions for conducting performance tests to demonstrate compliance
with the NOX emissions standards without using a
NOX CEMS. The EPA corrects paragraph (d) introductory text
to specify that owners or operators must conduct the performance test
at any load condition within 30 percent of 100 percent of
the base load rating and may perform testing at the highest achievable
load point if they cannot achieve at least 70 percent of the base load
rating in practice. The percentages listed in paragraph (d)
introductory text of the Final NSPS Rule inadvertently included 25 percent and 75 percent from Subpart KKKK. Subpart KKKKa
defines ``full load'' as greater than or equal to 70 percent of the
base load rating of the turbine. Therefore, the correct percentages are
`` 30 percent'' instead of `` 25 percent'' and
``70 percent'' instead of ``75 percent.'' The EPA makes the same
corrections to Sec. 60.4400a paragraph (d)(2).
At 91 FR 2000, second column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4405a, the EPA listed
instructions for conducting performance tests to demonstrate compliance
with the NOX emissions standards using a NOX
CEMS. The EPA corrects paragraph (b)(1) to specify that owners or
operators must conduct the performance test at a single load level,
within 30 percent of 100 percent of the base load rating,
and owners or operators may perform testing at the highest achievable
load point if they cannot achieve at least 70 percent of the base load
rating in practice. The percentages listed in paragraph (b)(1) of the
Final NSPS Rule inadvertently included 25 percent and 75
percent from Subpart KKKK. Subpart KKKKa defines ``full load'' as
greater than or equal to 70 percent of the base load rating of the
turbine. Therefore, the correct percentages are `` 30
percent'' instead of `` 25 percent'' and ``70 percent''
instead of ``75 percent.''
At 91 FR 2000, third column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4415a paragraph (a) and
paragraph (b) introductory text, the EPA listed instructions for owners
or operators to conduct performance tests to demonstrate compliance
with the SO2 emissions standard. The EPA corrects Sec.
60.4415a paragraph (a) to clarify that ``you may submit fuel records, .
. .'' instead of ``must submit fuel records,'' because using fuel
records is not the only acceptable method of demonstrating compliance.
Similarly, in Sec. 60.4415a paragraph (b) introductory text, the EPA
inadvertently omitted the phrase ``and are not using fuel records, you
. . .'' Accordingly, the EPA corrects the introductory text to read:
``If you are an owner or operator of an affected facility complying
with the SO2 emissions standard and are not using fuel
records, you must conduct the performance test by measuring the
SO2 emissions in the stationary combustion turbine exhaust
gases using the methods in either paragraph (b)(1) or (2) of this
section.''
At 91 FR 2001, second column, 40 CFR part 60, subpart
KKKKa. Final NSPS Rule instruction 30 added Subpart KKKKa consisting of
sections 60.4300a to 60.4420a. In Sec. 60.4420a, the Final NSPS Rule
included definitions that apply to this subpart. The EPA removes the
definitions of ``annual capacity factor,'' ``high-utilization source,''
and ``low-utilization source''
[[Page 43564]]
because Subpart KKKKa does not use those terms. In addition, the EPA
revises the definition of ``gross energy output'' in paragraph (3) to
specify a ``12-calendar-month'' instead of an ``annual'' basis, the
definition of ``stationary combustion turbine'' to move ``all related
requirements'' before the phrase ``promulgated pursuant to title II of
the Clean Air Act'' for grammatical correctness, and the definition of
``turbine tuning'' to clarify that Subpart KKKKa limits turbine tuning
to 30 hours per 12-calendar-month period. The use of the phrase ``12-
calendar-month'' instead of the word ``annual'' in the ``gross energy
output'' and ``turbine tuning'' definitions is necessary to ensure
consistency with the 12-calendar-month basis for emission standards and
the intent of the Final NSPS Rule. Furthermore, the EPA adds the
definition of ``utilization'' because that term is relevant for
subcategorization purposes.
At 91 FR 2004, table 1, second column, 40 CFR part 60,
subpart KKKKa. Final NSPS Rule instruction 30 added Table 1 to Subpart
KKKKa of Part 60--Nitrogen Oxide Emission Standards for Stationary
Combustion Turbines. In the second column of the table, ``Combustion
turbine base load rated heat input (HHV),'' the EPA set a heat-input
threshold for the subcategories of turbines ``Located north of the
Arctic Circle (latitude 66.5 degrees north), operating at ambient
temperatures less than 0 [deg]F (-18 [deg]C), modified or reconstructed
offshore turbines, operated during periods of turbine tuning,
byproduct-fired turbines, and/or operating at less than 70 percent of
the base load rating.'' Specifically, the EPA set the threshold for
this subcategory as a heat input-based threshold of 300 MMBtu/h. The
EPA intended for this threshold in Subpart KKKKa to be equivalent to
the output-based threshold of 30 MW in Subpart KKKK. The EPA attempted
to align the combustion turbine size subcategories in both subparts
with heat input-based thresholds for associated NOX
standards for consistency.\2\ The EPA did not intend to effectuate a
substantive change in the size threshold for these subcategories.\3\
However, the EPA is now aware that these two forms of threshold are not
equivalent for all combustion turbines in these subcategories that
could be subject to Subpart KKKKa, and this change inadvertently
substantively altered this threshold, which was not the Agency's
intent.\4\ Therefore, the EPA corrects this unintended error in table 1
to Subpart KKKKa by reverting to the output-based threshold of 30 MW in
Subpart KKKK for these subcategories of turbines in Subpart KKKKa.
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\2\ See 91 FR 1928 (January 15, 2026).
\3\ Id.
\4\ See the petition for reconsideration filed with the EPA by
the American Petroleum Institute (API), available in the rulemaking
docket under Docket ID EPA-HQ-OAR-2024-0419-0246. It is
the Agency's expectation that this correction fully resolves the
issue raised in this petition for reconsideration.
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At 91 FR 2004, table 1, first column, 40 CFR part 60,
subpart KKKKa. Final NSPS Rule instruction 30 added Table 1 to Subpart
KKKKa of Part 60--Nitrogen Oxide Emission Standards for Stationary
Combustion Turbines. To better clarify the NOX emission
standards applicable to stationary temporary combustion turbines
consistent with the discussion in the preamble,\5\ the EPA adds the
subcategories of temporary turbines firing natural gas and temporary
turbines firing fuels other than natural gas to the end of the table in
separate rows. The EPA removes the reference to temporary turbines from
the subcategory of ``New, firing natural gas, either offshore turbines,
turbines bypassing the heat recovery unit, and/or temporary turbines''
as a conforming edit and inserts ``and/or'' before the phrase
``turbines bypassing the heat recovery unit.''
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\5\ See 91 FR 1925 (January 15, 2026).
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Section 553 of the Administrative Procedure Act provides that when
an agency for good cause finds that notice and public procedure are
impracticable, unnecessary, or contrary to the public interest, the
agency may issue a rule without providing notice and an opportunity for
public comment.\6\ The EPA has determined that there is good cause for
making this rule final without prior proposal and opportunity for
comment because the changes to the rule are minor, noncontroversial in
nature, and correct inadvertent typographical and technical errors.
These changes align regulatory text with the EPA's expressed intent in
the Final NSPS Rule preamble and do not substantively change the
requirements of the Final NSPS Rule except to the extent necessary to
align the regulatory text with the EPA's intent, which the preamble
expressly states. Thus, the corrected regulatory text in this action
has already had notice and opportunity for public comment, rendering
further notice and opportunity for public comment unnecessary. The EPA
finds that this constitutes good cause under 5 U.S.C. 553(b)(B).
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\6\ 5 U.S.C. 553(b)(B).
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List of Subjects in 40 CFR Part 60
Environmental protection, Administrative practice and procedures,
Air pollution control, Reporting and recordkeeping requirements.
Accordingly, 40 CFR part 60 is corrected by making the following
correcting amendments:
PART 60--STANDARDS OF PERFORMANCE FOR NEW STATIONARY SOURCES
0
1. The authority citation for part 60 continues to read as follows:
Authority: 42 U.S.C. 7401 et seq.
Subpart GG--Standards of Performance for Stationary Gas Turbines
0
2. Amend Sec. 60.330 by revising paragraph (e) to read as follows:
Sec. 60.330 Applicability and designation of affected facility.
* * * * *
(e) A gas turbine that is subject to this subpart and is not a
``major source'' or located at a ``major source'' (as that term is
defined at 42 U.S.C. 7661 (2)) is exempt from the requirements of 42
U.S.C. 7661a(a).
Subpart KKKK--Standards of Performance for Stationary Combustion
Turbines
0
3. Amend Sec. 60.4305 by revising paragraph (e) to read as follows:
Sec. 60.4305 Does this subpart apply to my stationary combustion
turbine?
* * * * *
(e) Combustion turbines subject to title II of the Clean Air Act
are not subject to this subpart.
0
4. Amend Sec. 60.4331 by revising paragraph (a), paragraph (c)
introductory text, and paragraphs (d) and (e)(1) to read as follows:
Sec. 60.4331 What are the requirements for operating a stationary
temporary combustion turbine?
(a) Notwithstanding any other provision of this subpart, owners or
operators of a small- or medium-size stationary combustion turbine
(i.e., a combustion turbine with a base load rating less than or equal
to 850 MMBtu/h) at a single location for up to 24 consecutive months,
may elect to be a temporary combustion turbine and comply with the
requirements in paragraphs (b) through (e) of this section as an
alternative to the otherwise
[[Page 43565]]
applicable emission standards and monitoring, recordkeeping, and
reporting requirements of this subpart.
* * * * *
(c) Compliance with the NOX emissions standard must be
demonstrated through maintaining the documentation in paragraphs (c)(1)
and (2) of this section on-site:
* * * * *
(d) Compliance with the SO2 emissions standard must be
demonstrated through complying with the provisions in Sec. 60.4365.
(e) * * *
(1) The combustion turbine may only be located at the same
stationary source (or group of stationary sources located within a
contiguous area and under common control) for a total period of 24
consecutive months. This is the total period of residence time allowed
after the turbine commences operation at the location, regardless of
whether the turbine is in operation for the entire 24-consecutive-month
period.
* * * * *
0
5. Amend Sec. 60.4380 by revising paragraph (b)(3) to read as follows:
Sec. 60.4380 How are excess emissions and monitor downtime defined
for NOX?
* * * * *
(b) * * *
(3) For averaging periods during which multiple emissions standards
apply, the applicable standard for the averaging period is the
arithmetic average of the applicable standards during each hour. For
hours with multiple emission standards, the applicable standard for
that hour is determined based on the condition that corresponded to the
highest emissions standard.
* * * * *
0
6. Amend Sec. 60.4395 by revising the section heading to read as
follows:
Sec. 60.4395 When must I submit my reports?
* * * * *
0
7. Amend Sec. 60.4420 by revising the definition of ``Stationary
combustion turbine'' to read as follows:
Sec. 60.4420 What definitions apply to this subpart?
* * * * *
Stationary combustion turbine means all equipment, including but
not limited to the turbine, the fuel, air, lubrication and exhaust gas
systems, control systems (except emissions control equipment), heat
recovery system, and any ancillary components and sub-components
comprising any simple cycle stationary combustion turbine, any
regenerative/recuperative cycle stationary combustion turbine, any
combined cycle combustion turbine, and any combined heat and power
combustion turbine based system. Stationary means that the combustion
turbine is not self-propelled or intended to be propelled while
performing its function. It may, however, be mounted on a vehicle for
portability. Portable combustion turbines are excluded from the
definition of ``stationary combustion turbine,'' and not regulated
under this part, if the combustion turbine meets the definition of
``nonroad engine'' under title II of the Clean Air Act and applicable
regulations and is certified to meet emission standards and all related
requirements promulgated pursuant to title II of the Clean Air Act.
* * * * *
0
8. Revise table 1 to subpart KKKK of part 60 to read as follows:
Table 1 to Subpart KKKK of Part 60--Nitrogen Oxide Emission Limits for
New Stationary Combustion Turbines
------------------------------------------------------------------------
Combustion
turbine heat NOX emission standard
Combustion turbine type input at peak
load (HHV)
------------------------------------------------------------------------
New turbine firing natural <=50 MMBtu/h..... 42 ppm at 15 percent
gas, electric generating. O2 or 290 ng/J of
useful output (2.3
lb/MWh).
New turbine firing natural <=50 MMBtu/h..... 100 ppm at 15 percent
gas, mechanical drive. O2 or 690 ng/J of
useful output (5.5
lb/MWh).
New turbine firing natural gas >50 MMBtu/h and 25 ppm at 15 percent
<=850 MMBtu/h. O2 or 150 ng/J of
useful output (1.2
lb/MWh).
New, modified, or >850 MMBtu/h..... 15 ppm at 15 percent
reconstructed turbine firing O2 or 54 ng/J of
natural gas. useful output (0.43
lb/MWh).
New turbine firing fuels other <=50 MMBtu/h..... 96 ppm at 15 percent
than natural gas, electric O2 or 700 ng/J of
generating. useful output (5.5
lb/MWh).
New turbine firing fuels other <=50 MMBtu/h..... 150 ppm at 15 percent
than natural gas, mechanical O2 or 1,100 ng/J of
drive. useful output (8.7
lb/MWh).
New turbine firing fuels other >50 MMBtu/h and 74 ppm at 15 percent
than natural gas. <=850 MMBtu/h. O2 or 460 ng/J of
useful output (3.6
lb/MWh).
New, modified, or >850 MMBtu/h..... 42 ppm at 15 percent
reconstructed turbine firing O2 or 160 ng/J of
fuels other than natural gas. useful output (1.3
lb/MWh).
Modified or reconstructed <=50 MMBtu/h..... 150 ppm at 15 percent
turbine. O2 or 1,100 ng/J of
useful output (8.7
lb/MWh).
Modified or reconstructed >50 MMBtu/h and 42 ppm at 15 percent
turbine firing natural gas. <=850 MMBtu/h. O2 or 250 ng/J of
useful output (2.0
lb/MWh).
Modified or reconstructed >50 MMBtu/h and 96 ppm at 15 percent
turbine firing fuels other <=850 MMBtu/h. O2 or 590 ng/J of
than natural gas. useful output (4.7
lb/MWh).
Turbines located north of the <=30 MW output... 150 ppm at 15 percent
Arctic Circle (latitude 66.5 O2 or 1,100 ng/J of
degrees north); turbines useful output (8.7
operating at less than 75 lb/MWh).
percent of peak load;
modified and reconstructed
offshore turbines; and
turbines operating at
temperatures less than 0
[deg]F.
Turbines located north of the >30 MW output.... 96 ppm at 15 percent
Arctic Circle (latitude 66.5 O2 or 590 ng/J of
degrees north); turbines useful output (4.7
operating at less than 75 lb/MWh).
percent of peak load;
modified and reconstructed
offshore turbines; and
turbines operating at
temperatures less than 0
[deg]F.
[[Page 43566]]
Heat recovery units operating All sizes........ 54 ppm at 15 percent
independent of the combustion O2 or 110 ng/J of
turbine. useful output (0.86
lb/MWh).
Combustion turbines bypassing >50 MMBtu/h...... 25 ppm at 15 percent
the heat recovery unit firing O2 or 150 ng/J of
natural gas. useful output (1.2
lb/MWh).
Temporary turbine firing <=850 MMBtu/h.... 25 ppm at 15 percent
natural gas. O2 or 150 ng/J of
useful output (1.2
lb/MWh).
Temporary turbine firing fuels <=850 MMBtu/h.... 74 ppm at 15 percent
other than natural gas. O2 or 460 ng/J of
useful output (3.6
lb/MWh).
------------------------------------------------------------------------
Subpart KKKKa--Standards of Performance for Stationary Combustion
Turbines
0
9. Amend Sec. 60.4310a by revising paragraph (d) to read as follows:
Sec. 60.4310a What stationary combustion turbines are not subject to
this subpart?
* * * * *
(d) Combustion turbines subject to title II of the Clean Air Act
are not subject to this subpart.
0
10. Amend Sec. 60.4331a by revising paragraph (a), paragraph (c)
introductory text, and paragraphs (d) and (e)(1) to read as follows:
Sec. 60.4331a What are the requirements for operating a stationary
temporary combustion turbine?
(a) Notwithstanding any other provision of this subpart, owners or
operators of a small- or medium-size stationary combustion turbine
(i.e., a combustion turbine with a base load rating less than or equal
to 850 MMBtu/h) at a single location for up to 24 consecutive months,
may elect to be a temporary combustion turbine and comply with the
requirements in paragraphs (b) through (e) of this section as an
alternative to the otherwise applicable emission standards and
monitoring, recordkeeping, and reporting requirements of this subpart.
* * * * *
(c) Compliance with the NOX emissions standard must be
demonstrated through maintaining the documentation in paragraphs (c)(1)
and (2) of this section on-site:
* * * * *
(d) Compliance with the SO2 emissions standard must be
demonstrated through complying with the provisions in Sec. 60.4372a.
(e) * * *
(1) The combustion turbine may only be located at the same
stationary source (or group of stationary sources located within a
contiguous area and under common control) for a total period of 24
consecutive months. This is the total period of residence time allowed
after the turbine commences operation at the location, regardless of
whether the turbine is in operation for the entire 24-consecutive-month
period.
* * * * *
0
11. Amend Sec. 60.4333a by revising paragraphs (b)(1) and (d)(3) to
read as follows:
Sec. 60.4333a What are my general requirements for complying with
this subpart?
* * * * *
(b) * * *
(1) Except as provided for in paragraphs (b)(2) through (5) of this
section, you must conduct subsequent performance tests within 14
calendar months of the date that the previous performance test was
conducted.
* * * * *
(d) * * *
(3) Conduct an initial performance test according to Sec. 60.8 and
use the applicable methods in Sec. 60.4415a. Thereafter, maintain
records (such as a current, valid purchase contract, tariff sheet, or
transportation contract) documenting that total sulfur content for the
initial and subsequent fuel combusted in your stationary combustion
turbine at all times does not exceed applicable conditions specified in
Sec. 60.4370a or Sec. 60.4372a; or
* * * * *
0
12. Amend Sec. 60.4350a by revising paragraph (d) and equation 1 to
paragraph (f)(1) to read as follows:
Sec. 60.4350a How do I use the NOX CEMS data to determine excess
emissions?
* * * * *
(d) Data used to meet the requirements of this subpart shall not
include substitute data values derived from the missing data procedures
of part 75 of this chapter, nor shall the data be bias adjusted
according to the procedures of part 75 of this chapter. For units
complying with the 12-calendar-month mass-based standard, emissions for
hours of missing data shall be estimated by using the average emissions
rate of non-out-of-control hours within 10 percent of the
hourly load value of missing data within the 12-calendar-month period.
If non-out-of-control data is not available, the maximum hourly
emissions rate during the 12-calendar-month period shall be used.
* * * * *
(f) * * *
(1) * * *
Equation 1 to Paragraph (f)(1)
[GRAPHIC] [TIFF OMITTED] TR16JY26.505
Where:
P = Gross or net energy output of the stationary combustion turbine
system in MWh;
(Pe)t = Electrical or mechanical energy output of the
combustion turbine engine in MWh;
[[Page 43567]]
(Pe)c = Electrical or mechanical energy output (if any)
of the steam turbine in MWh;
PeA = Electric energy used for any auxiliary loads in MWh
(only applicable to owners/operators electing to demonstrate
compliance on a net output basis);
Ps = Useful thermal energy of the steam, measured
relative to ISO conditions, not used to generate additional electric
or mechanical output, in MWh;
Po = Other useful heat recovery, measured relative to ISO
conditions, not used for steam generation or performance enhancement
of the stationary combustion turbine; and
T = Electric Transmission and Distribution Factor. Equal to 0.95 for
CHP combustion turbine where at least 20.0 percent of the total
gross useful energy output consists of electric or direct mechanical
output and 20.0 percent of the total gross useful energy output
consists of useful thermal output on a 12-calendar-month basis.
Equal to 1.0 for all other combustion turbines.
* * * * *
0
13. Amend Sec. 60.4374a by revising equation 2 to paragraph (g)(2) to
read as follows:
Sec. 60.4374a How do I demonstrate compliance with my SO2 emissions
standard and determine excess emissions using a SO2 CEMS?
* * * * *
(g) * * *
(2) * * *
Equation 2 to Paragraph (g)(2)
[GRAPHIC] [TIFF OMITTED] TR16JY26.506
Where:
P = Gross energy output of the stationary combustion turbine system
in MWh;
(Pe)t = Electrical or mechanical energy output of the
stationary combustion turbine in MWh;
(Pe)c = Electrical or mechanical energy output (if any)
of the steam turbine in MWh;
PeA = Electric energy used for any auxiliary loads in
MWh;
Ps = Useful thermal energy of the steam, measured
relative to ISO conditions, not used to generate additional electric
or mechanical output, in MWh;
Po = Other useful heat recovery, measured relative to ISO
conditions, not used for steam generation or performance enhancement
of the stationary combustion turbine; and
T = Electric Transmission and Distribution Factor. Equal to 0.95 for
CHP combustion turbine where at least 20.0 percent of the total
gross useful energy output consists of electric or direct mechanical
output and 20.0 percent of the total gross useful energy output
consists of useful thermal output on a 12-calendar-month basis.
Equal to 1.0 for all other combustion turbines.
* * * * *
0
14. Amend Sec. 60.4400a by revising paragraph (d) introductory text
and paragraph (d)(2) to read as follows:
Sec. 60.4400a How do I conduct performance tests to demonstrate
compliance with my NOX emissions standard if I do not have a NOX CEMS?
* * * * *
(d) The performance test must be done at any load condition within
30 percent of 100 percent of the base load rating. You may
perform testing at the highest achievable load point, if at least 70
percent of the base load rating cannot be achieved in practice. You
must conduct three separate test runs for each performance test. The
minimum time per run is 20 minutes.
* * * * *
(2) For a combined cycle or CHP combustion turbine with
supplemental heat (duct burner), you must measure the total
NOX emissions downstream of the duct burner. The duct burner
must be in operation within 30 percent of 100 percent of
the base load rating of the duct burners or the highest achievable load
if at least 70 percent of the base load rating of the duct burners
cannot be achieved during the performance test.
* * * * *
0
15. Amend Sec. 60.4405a by revising paragraph (b)(1) to read as
follows:
Sec. 60.4405a How do I conduct a performance test if I use a NOX
CEMS?
* * * * *
(b) * * *
(1) Perform a minimum of nine RATA reference method runs, with a
minimum time per run of 21 minutes, at a single load level, within
30 percent of 100 percent of the base load rating while the
source is combusting the fuel that is a normal primary fuel for that
source. You may perform testing at the highest achievable load point,
if at least 70 percent of the base load rating cannot be achieved in
practice. The ambient temperature must be greater than 0 [deg]F during
the RATA runs. The Administrator or delegated authority may approve
performance testing below 0 [deg]F if the timing of the required
performance test and environmental conditions make it impractical to
test at ambient conditions greater than 0 [deg]F.
* * * * *
0
16. Amend Sec. 60.4415a by revising paragraph (a) and paragraph (b)
introductory text to read as follows:
Sec. 60.4415a How do I conduct performance tests to demonstrate
compliance with my SO2 emissions standard?
(a) If you are an owner or operator of an affected facility
complying with the fuel-based standard, you may submit fuel records
(such as a current, valid purchase contract, tariff sheet,
transportation contract, or results of a fuel analysis) to satisfy the
requirements of Sec. 60.8.
(b) If you are an owner or operator of an affected facility
complying with the SO2 emissions standard and are not using
fuel records, you must conduct the performance test by measuring the
SO2 emissions in the stationary combustion turbine exhaust
gases using the methods in either paragraph (b)(1) or (2) of this
section.
* * * * *
0
17. Amend Sec. 60.4420a by:
0
a. Removing the definition of ``Annual capacity factor'';
0
b. Revising the definition of ``Gross energy output'';
0
c. Removing the definitions of ``High-utilization source'' and ``Low-
utilization source'';
0
d. Revising the definitions of ``Stationary combustion turbine'' and
``Turbine tuning''; and
0
e. Adding the definition of ``Utilization'' in alphabetical order.
The revisions and addition read as follows:
Sec. 60.4420a What definitions apply to this subpart?
* * * * *
Gross energy output means:
(1) For simple cycle and combined cycle combustion turbines, the
gross useful work performed is the gross electrical or direct
mechanical output from both the combustion turbine engine and any
associated steam turbine(s).
(2) For a CHP combustion turbine, the gross useful work performed
is the gross electrical or direct mechanical output from both the
combustion turbine engine and any associated steam turbine(s) plus any
useful thermal output measured relative to ISO
[[Page 43568]]
conditions that is not used to generate additional electrical or
mechanical output or to enhance the performance of the unit (i.e.,
steam delivered to an industrial process).
(3) For a CHP combustion turbine where at least 20.0 percent of the
total gross useful energy output consists of useful thermal output on a
12-calendar-month basis, the gross useful work performed is the gross
electrical or direct mechanical output from both the combustion turbine
engine and any associated steam turbine(s) divided by 0.95 plus any
useful thermal output measured relative to ISO conditions that is not
used to generate additional electrical or mechanical output or to
enhance the performance of the unit (i.e., steam delivered to an
industrial process).
(4) For a district energy CHP combustion turbine where at least
20.0 percent of the total gross useful energy output consists of useful
thermal output on a 12-calendar-month basis, the gross useful work
performed is the gross electrical or direct mechanical output from both
the combustion turbine engine and any associated steam turbine(s)
divided by 0.95 plus any useful thermal output measured relative to ISO
conditions that is not used to generate additional electrical or
mechanical output or to enhance the performance of the unit (e.g.,
steam delivered to an industrial process) divided by 0.95.
* * * * *
Stationary combustion turbine means all equipment including, but
not limited to, the combustion turbine engine, the fuel, air,
lubrication and exhaust gas systems, control systems (except post
combustion emissions control equipment), heat recovery system
(including heat recovery steam generators and duct burners); steam
turbine; fuel compressor and/or pump, any ancillary components and sub-
components comprising any simple cycle stationary combustion turbine,
any combined cycle combustion turbine, and any combined heat and power
combustion turbine based system; plus any integrated equipment that
provides electricity or useful thermal output to the combustion turbine
engine (e.g., onsite photovoltaics), heat recovery system, or auxiliary
equipment. Stationary means that the combustion turbine is not self-
propelled or intended to be propelled while performing its function. It
may, however, be mounted on a vehicle for portability. Portable
combustion turbines are excluded from the definition of ``stationary
combustion turbine,'' and not regulated under this part, if the
combustion turbine meets the definition of ``nonroad engine'' under
title II of the Clean Air Act and applicable regulations and is
certified to meet emissions standards and all related requirements
promulgated pursuant to title II of the Clean Air Act.
* * * * *
Turbine tuning means planned maintenance or parameter performance
testing of a combustion turbine engine involving adjustment of the
operating configuration to maintain proper combustion dynamics or
testing machine operating performance. Turbine tuning is limited to 30
hours per 12-calendar-month period.
* * * * *
Utilization means the ratio between the actual heat input to a
combustion turbine engine (not including any heat input to an HRSG)
during a 12-calendar-month period and the potential heat input to the
combustion turbine engine had it operated at the base load rating for
every hour during the 12-calendar-month period. Heat input during a
system emergency as defined in this section is excluded when
determining the utilization rate. Actual and potential heat input
derived from non-combustion sources (e.g., solar thermal) are not
included when calculating the utilization.
* * * * *
0
18. Revise table 1 to subpart KKKKa of part 60 to read as follows:
Table 1 to Subpart KKKKa of Part 60--Nitrogen Oxide Emission Standards for Stationary Combustion Turbines
----------------------------------------------------------------------------------------------------------------
Combustion turbine Input-based NOX
Combustion turbine type base load rated heat emission standard 1 Optional output-based NOX
input (HHV) standard 2
----------------------------------------------------------------------------------------------------------------
New, firing natural gas with >850 MMBtu/h.......... 5 ppm at 15 percent O2 0.054 kg/MWh-gross (0.12 lb/
utilization rate >45 percent. or 7.9 ng/J (0.018 lb/ MWh-gross) 0.055 kg/MWh-
MMBtu). net (0.12 lb/MWh-net).
New, firing natural gas with >850 MMBtu/h.......... 25 ppm at 15 percent 0.38 kg/MWh-gross (0.83 lb/
utilization rate <=45 percent and O2 or 40 ng/J (0.092 MWh-gross) 0.39 kg/MWh-net
with design efficiency >=38 lb/MMBtu). (0.85 lb/MWh-net).
percent.
New, firing natural gas with >850 MMBtu/h.......... 9 ppm at 15 percent O2 0.17 kg/MWh-gross (0.37 lb/
utilization rate <=45 percent and or 14 ng/J (0.033 lb/ MWh-gross) 0.17 kg/MWh-net
with design efficiency <38 percent. MMBtu). (0.38 lb/MWh-net).
New, modified, or reconstructed, >850 MMBtu/h.......... 42 ppm at 15 percent 0.45 kg/MWh-gross (1.0 lb/
firing non-natural gas. O2 or 70 ng/J (0.16 MWh-gross) 0.46 kg/MWh-net
lb/MMBtu). (1.0 lb/MWh-net).
Modified or reconstructed, firing >850 MMBtu/h.......... 25 ppm at 15 percent 0.38 kg/MWh-gross (0.83 lb/
natural gas, at all utilization O2 or 40 ng/J (0.092 MWh-gross) 0.39 kg/MWh-net
rates, with design efficiency >=38 lb/MMBtu). (0.85 lb/MWh-net).
percent.
Modified or reconstructed, firing >850 MMBtu/h.......... 15 ppm at 15 percent 0.28 kg/MWh-gross (0.62 lb/
natural gas, at all utilization O2 or 24 ng/J (0.055 MWh-gross) 0.29 kg/MWh-net
rates, with design efficiency <38 lb/MMBtu). (0.30 lb/MWh-net).
percent.
New, firing natural gas, at >50 MMBtu/h and <=850 15 ppm at 15 percent 0.20 kg/MWh-gross (0.43 lb/
utilization rate >45 percent. MMBtu/h. O2 or 24 ng/J (0.055 MWh-gross) 0.20 kg/MWh-net
lb/MMBtu). (0.44 lb/MWh-net).
New, firing natural gas, at >50 MMBtu/h and <=850 25 ppm at 15 percent 0.54 kg/MWh-gross (1.2 lb/
utilization rate <=45 percent. MMBtu/h. O2 or 40 ng/J (0.092 MWh-gross) 0.56 kg/MWh-net
lb/MMBtu). (1.2 lb/MWh-net).
Modified or reconstructed, firing >20 MMBtu/h and <=850 42 ppm at 15 percent 0.91 kg/MWh-gross (2.0 lb/
natural gas. MMBtu/h. O2 or 67 ng/J (0.15 MWh-gross) 0.92 kg/MWh-net
lb/MMBtu). (2.0 lb/MWh-net).
[[Page 43569]]
New, firing non-natural gas........ >50 MMBtu/h and <=850 74 ppm at 15 percent 1.6 kg/MWh-gross (3.6 lb/
MMBtu/h. O2 or 120 ng/J (0.29 MWh-gross) 1.6 kg/MWh-net
lb/MMBtu). (3.7 lb/MWh-net).
Modified or reconstructed, firing >20 MMBtu/h and <=850 96 ppm at 15 percent 2.1 kg/MWh-gross (4.7 lb/
non-natural gas. MMBtu/h. O2 or 160 ng/J (0.37 MWh-gross) 2.2 kg/MWh-net
lb/MMBtu). (4.8 lb/MWh-net).
New, firing natural gas............ <=50 MMBtu/h.......... 25 ppm at 15 percent 0.64 kg/MWh-gross (1.4 lb/
O2 or 40 ng/J (0.092 MWh-gross) 0.65 kg/MWh-net
lb/MMBtu). (1.4 lb/MWh-net).
New, firing non-natural gas........ <=50 MMBtu/h.......... 96 ppm at 15 percent 2.4 kg/MWh-gross (5.3 lb/
O2 or 160 ng/J (0.37 MWh-gross) 2.5 kg/MWh-net
lb/MMBtu). (5.4 lb/MWh-net).
Modified or reconstructed, all <=20 MMBtu/h.......... 150 ppm at 15 percent 3.9 kg/MWh-gross (8.7 lb/
fuels. O2 or 240 ng/J (0.55 MWh-gross) 4.0 kg/MWh-net
lb/MMBtu). (8.9 lb/MWh-net).
New, firing natural gas, either >50 MMBtu/h........... 25 ppm at 15 percent N/A.
offshore turbines and/or turbines O2 or 40 ng/J (0.092
bypassing the heat recovery unit. lb/MMBtu).
Located north of the Arctic Circle <=30 MW output........ 150 ppm at 15 percent N/A.
(latitude 66.5 degrees north), O2 or 240 ng/J (0.55
operating at ambient temperatures lb/MMBtu).
less than 0 [deg]F (-18 [deg]C),
modified or reconstructed offshore
turbines, operated during periods
of turbine tuning, byproduct-fired
turbines, and/or operating at less
than 70 percent of the base load
rating.
Located north of the Arctic Circle > 30 MW output........ 96 ppm at 15 percent N/A.
(latitude 66.5 degrees north), O2 or 150 ng/J (0.35
operating at ambient temperatures lb/MMBtu).
less than 0 [deg]F (-18 [deg]C),
modified or reconstructed offshore
turbines, operated during periods
of turbine tuning, byproduct-fired
turbines, and/or operating at less
than 70 percent of the base load
rating.
Heat recovery units operating All sizes............. 54 ppm at 15 percent N/A.
independent of the combustion O2 or 86 ng/J (0.20
turbine. lb/MMBtu).
Temporary turbines firing natural <=850 MMBtu/h......... 25 ppm at 15 percent N/A.
gas. O2 or 40 ng/J (0.092
lb/MMBtu).
Temporary turbines firing non- <=850 MMBtu/h......... 74 ppm at 15 percent N/A.
natural gas. O2 or 120 ng/J (0.29
lb/MMBtu).
----------------------------------------------------------------------------------------------------------------
\1\ Input-based standards are determined on a 4-operating-hour rolling average basis.
\2\ Output-based standards are determined on a 30-operating-day average basis.
Aaron Szabo,
Assistant Administrator,Office of Air and Radiation.
[FR Doc. 2026-14371 Filed 7-15-26; 8:45 am]
BILLING CODE 6560-50-P