| (a) Nitrogen oxides (NOX )
emission specifications. The owner or operator of any utility boiler,
auxiliary steam boiler, or stationary gas turbine subject to this
division shall not allow the discharge into the atmosphere, emissions
of NOX in excess of the following:
(1) utility boilers:
(A) 0.06 pounds per million British thermal units (lb/MMBtu)
heat input from utility boilers that are part of a small utility system,
as defined in §117.10 of this title (relating to Definitions):
(i) on a rolling 24-hour average basis during the months
of March through October of each calendar year; and
(ii) on a rolling 30-day average basis during the months
of November, December, January, and February of each calendar year;
(B) 0.033 lb/MMBtu heat input from utility boilers
that are part of a large utility system, as defined in §117.10
of this title:
(i) on a rolling 24-hour average basis during the months
of March through October of each calendar year; and
(ii) on a rolling 30-day average basis during the months
of November, December, January, and February of each calendar year;
(C) 0.50 pounds per megawatt-hour output on an annual
average basis; or
(D) 0.033 lb/MMBtu heat input on a system-wide heat
input weighted average basis for utility boilers that are part of
a large utility system, as defined in §117.10 of this title:
(i) on a rolling 168-hour average basis for each hour
during which fuel was combusted in any unit in the system; and
(ii) determined according to the following equation:
Attached Graphic
(2) auxiliary steam boilers:
(A) 0.26 lb/MMBtu heat input on a rolling 24-hour average
and 0.20 lb/MMBtu heat input on a 30-day rolling average while firing
natural gas or a combination of natural gas and waste oil;
(B) 0.30 lb/MMBtu heat input on a rolling 24-hour averaging
period while firing fuel oil only;
(C) the heat input weighted average of the applicable
emission specifications specified in subparagraphs (A) and (B) of
this paragraph on a rolling 24-hour averaging period while firing
a mixture of natural gas and fuel oil, as follows:
Attached Graphic
(D) for each auxiliary steam boiler that is an affected
facility as defined by New Source Performance Standards (NSPS) 40
Code of Federal Regulations Part 60, Subparts D, Db, or Dc, the applicable
NSPS NOX emission limit, unless the boiler
is also subject to a more stringent permit emission limit, in which
case the more stringent emission limit applies. Each auxiliary steam
boiler subject to an emission specification under this subparagraph
is not subject to the emission specifications of subparagraphs (A),
(B), or (C) of this paragraph.
(3) stationary gas turbines:
(A) with a megawatt (MW) rating greater than or equal
to 30 MW and an annual electric output in megawatt-hr (MW-hr) of greater
than or equal to the product of 2,500 hours and the MW rating of the
unit, NOX emissions in excess of a block
one-hour average of:
(i) 42 parts per million by volume (ppmv) at 15% oxygen
(O2), dry basis, while firing natural
gas; and
(ii) 65 ppmv at 15% O2,
dry basis, while firing fuel oil; and
(B) used for peaking service with an annual electric
output in MW-hr of less than the product of 2,500 hours and the MW
rating of the unit, NOX emissions in
excess of a block one-hour average of:
(i) 0.20 lb/MMBtu heat input while firing natural gas;
and
(ii) 0.30 lb/MMBtu heat input while firing fuel oil.
(b) Related emissions. The owner or operator of any
unit subject to the emission specifications of subsection (a) of this
section shall not allow emissions in excess of the following, except
as provided in §117.1325 of this title (relating to Alternative
Case Specific Specifications):
(1) for utility boilers or auxiliary steam boilers,
carbon monoxide (CO) emissions of 400 ppmv at 3.0% O2, dry (or alternatively, 0.30 lb/MMBtu heat
input for gas-fired units and 0.31 lb/MMBtu heat input for oil-fired
units), based on:
(A) a block one-hour averaging period for units not
equipped with a continuous emissions monitoring system (CEMS) or predictive
emissions monitoring system (PEMS) for CO; and
(B) a rolling 24-hour averaging period for units equipped
with CEMS or PEMS for CO;
(2) for any stationary gas turbine with a MW rating
greater than or equal to 10 MW, CO emissions in excess of a block
one-hour average of 132 ppmv at 15% O2,
dry basis; and
(3) for units that inject urea or ammonia into the
exhaust stream for NOX control, ammonia
emissions of 10 ppmv, at 3.0% O2, dry,
for utility boilers or auxiliary steam boilers and 15% O2, dry, for stationary gas turbines (including
duct burners used in turbine exhaust ducts), based on:
(A) a block one-hour averaging period for units not
equipped with a CEMS or PEMS for ammonia; and
(B) a rolling 24-hour averaging period for units equipped
with CEMS or PEMS for ammonia.
(c) Compliance flexibility.
(1) An owner or operator may use §117.9800 of
this title (relating to Use of Emission Credits for Compliance) to
comply with the NOX emission specifications
of this section.
(2) Section 117.1325 of this title is not an applicable
method of compliance with the NOX emission
specifications of this section.
(3) An owner or operator may petition the executive
director for an alternative to the CO or ammonia specifications of
this section in accordance with §117.1325 of this title.
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