NR 428.22(1)(g)1.c. c. If biologically derived gaseous fuel-fired, 35 parts per million dry volume.

NR 428.22(1)(g)2. 2. For a unit with a maximum design power output equal to or greater than 25 megawatts and less than 50 megawatts, one of the following as applicable:

NR 428.22(1)(g)2.a. a. If natural gas-fired, 42 parts per million dry volume.

NR 428.22(1)(g)2.b. b. If distillate oil fuel-fired, 96 parts per million dry volume.

NR 428.22(1)(g)2.c. c. If biologically derived gaseous fuel-fired, 35 parts per million dry volume.

NR 428.22(1)(h) (h) Combined cycle combustion turbines. For a combined cycle combustion turbine, one of the following exhaust outlet concentrations, corrected to 15% O2 and at ambient temperatures greater than 0oF, as applicable:

NR 428.22(1)(h)1. 1. For a natural gas-fired unit with a maximum design power output equal to or greater than 25 megawatts, 9 parts per million dry volume.

NR 428.22(1)(h)2. 2. For a natural gas-fired unit with a maximum design power output equal to or greater than 10 megawatts and less than 25 megawatts, 42 parts per million dry volume.

NR 428.22(1)(h)3. 3. For a distillate oil fuel-fired unit with a maximum design power output equal to or greater than 10 megawatts, 42 parts per million dry volume.

NR 428.22(1)(h)4. 4. For a biologically derived gaseous fuel-fired unit with a maximum design power output equal to or greater than 10 megawatts, 35 parts per million dry volume.

NR 428.22(1)(i) (i) Reciprocating engines. For a reciprocating engine with a maximum design power output equal to or greater than 500 horsepower, one of the following as applicable:

NR 428.22(1)(i)1. 1. For a rich-burn spark ignition unit, 3.0 grams per brake horsepower-hour.

NR 428.22(1)(i)2. 2. For a lean-burn spark ignition unit, 3.0 grams per brake horsepower-hour.

NR 428.22(1)(i)3. 3. For a diesel fuel-fired compression unit, 3.0 grams per brake horsepower-hour.

NR 428.22(1)(i)4. 4. For a dual fuel-fired compression unit, 3.0 grams per brake horsepower-hour.

NR 428.22(2) (2) Electric utility boiler compliance schedule. The owner or operator of an electric utility boiler shall demonstrate compliance with the following interim NOx emission limitations, as applicable, on a 30-day rolling average by May 1, 2009 and with the emission limitations in sub. (1) (a) on and after May 1, 2013:

NR 428.22(2)(a) (a) For a solid fuel-fired boiler with a maximum heat input capacity equal to or greater than 1,000 mmBtu per hour, one of the following, as applicable:

NR 428.22(2)(a)1. 1. If tangential, wall, cyclone or fluidized bed-fired, 0.15 pound per mmBtu of heat input.

NR 428.22(2)(a)2. 2. If arch-fired, 0.18 pound per mmBtu of heat input.

NR 428.22(2)(b) (b) For a solid fuel-fired boiler with a maximum heat input capacity equal to or greater than 500 mmBtu per hour and less than 1,000 mmBtu per hour, one of the following, as applicable:

NR 428.22(2)(b)1. 1. If tangential-fired, 0.15 pound per mmBtu of heat input.

NR 428.22(2)(b)2. 2. If wall-fired, 0.20 pound per mmBtu of heat input.

NR 428.22(2)(b)3. 3. If cyclone-fired, 0.20 pound per mmBtu of heat input.

NR 428.22(2)(b)4. 4. If arch-fired, 0.18 pound per mmBtu of heat input.

NR 428.22(2)(b)5. 5. If fluidized bed-fired, 0.15 pound per mmBtu of heat input.

NR 428.22(3) (3) Emissions units using secondary fuel. An emissions unit that is capable of firing secondary fuel is not subject to the requirements under sub. (1) or (2) when utilizing only a secondary fuel if any of the following apply:

NR 428.22(3)(a) (a) The emissions unit heat input capacity or maximum design power output while utilizing the secondary fuel is less than the applicability thresholds under sub. (1) or (2).

NR 428.22(3)(b) (b) The emissions unit burns the secondary fuel only during any of the following periods:

NR 428.22(3)(b)1. 1. Supply interruption or curtailment of primary fuel. The secondary fuel usage under this subsection may not exceed 500 hours within a 12 consecutive month time period unless the owner or operator obtains a fuel variance under s. NR 436.06.