(a) Emission Specifications. No person shall allow the discharge into the atmosphere nitrogen oxides (NOX ) emissions in excess of the following emission specifications, in accordance with the applicable schedule in §117.9110 of this title (relating to Compliance Schedule for Bexar County Ozone Nonattainment Area Utility Electric Generation Sources):
(1) stationary gas turbines, including duct burners used in turbine exhaust ducts, 0.032 pound per million British thermal units (lb/MMBtu) heat input on a rolling 30-day average basis;
(2) utility boilers or auxiliary steam boilers, while firing natural gas or a combination of natural gas and oil, 0.20 lb/MMBtu heat input on a rolling 30-day average basis;
(3) utility boilers or auxiliary steam boilers controlled with selective catalytic reduction, while firing coal, 0.069 lb/MMBtu heat input on a rolling 30-day average basis;
(4) utility boilers or auxiliary steam boilers not controlled with selective catalytic reduction, while firing coal, 0.20 lb/MMBtu heat input on a rolling 30-day average basis; and
(5) utility boilers or auxiliary steam boilers, while firing oil only, 0.30 lb/MMBtu heat input on an hourly basis.
(b) Compliance flexibility. An owner or operator may use any of the following alternative methods to comply with the NOX emission specifications of this section:
(1) §117.1120 of this title (relating to System Cap); or
(2) §117.9800 of this title (relating to Use of Emission Credits for Compliance).
Source Note: The provisions of this §117.1105 adopted to be effective May 16, 2024, 49 TexReg 3347