Table 1 to Subpart KKKK of Part 60—Nitrogen Oxide Emission Limits for New Stationary Combustion Turbines

- Table 1 to Subpart KKKK of Part 60—Nitrogen Oxide Emission Limits for New Stationary Combustion Turbines

Combustion turbine type	Combustion turbine heat input at peak load (HHV)	NOX emission standard	New turbine firing natural gas, electric generating	≤50 MMBtu/h	42 ppm at 15 percent O2 or 290 ng/J of useful output (2.3 lb/MWh).	New turbine firing natural gas, mechanical drive	≤50 MMBtu/h	100 ppm at 15 percent O2 or 690 ng/J of useful output (5.5 lb/MWh).	New turbine firing natural gas	>50 MMBtu/h and ≤850 MMBtu/h	25 ppm at 15 percent O2 or 150 ng/J of useful output (1.2 lb/MWh).	New, modified, or reconstructed turbine firing natural gas	>850 MMBtu/h	15 ppm at 15 percent O2 or 54 ng/J of useful output (0.43 lb/MWh).	New turbine firing fuels other than natural gas, electric generating	≤50 MMBtu/h	96 ppm at 15 percent O2 or 700 ng/J of useful output (5.5 lb/MWh).	New turbine firing fuels other than natural gas, mechanical drive	≤50 MMBtu/h	150 ppm at 15 percent O2 or 1,100 ng/J of useful output (8.7 lb/MWh).	New turbine firing fuels other than natural gas	>50 MMBtu/h and ≤850 MMBtu/h	74 ppm at 15 percent O2 or 460 ng/J of useful output (3.6 lb/MWh).	New, modified, or reconstructed turbine firing fuels other than natural gas	>850 MMBtu/h	42 ppm at 15 percent O2 or 160 ng/J of useful output (1.3 lb/MWh).	Modified or reconstructed turbine	≤50 MMBtu/h	150 ppm at 15 percent O2 or 1,100 ng/J of useful output (8.7 lb/MWh).	Modified or reconstructed turbine firing natural gas	>50 MMBtu/h and ≤850 MMBtu/h	42 ppm at 15 percent O2 or 250 ng/J of useful output (2.0 lb/MWh).	Modified or reconstructed turbine firing fuels other than natural gas	>50 MMBtu/h and ≤850 MMBtu/h	96 ppm at 15 percent O2 or 590 ng/J of useful output (4.7 lb/MWh).	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 °F	≤30 MW output	150 ppm at 15 percent O2 or 1,100 ng/J of useful output (8.7 lb/MWh).	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 °F	>30 MW output	96 ppm at 15 percent O2 or 590 ng/J of useful output (4.7 lb/MWh).	Heat recovery units operating independent of the combustion turbine	All sizes	54 ppm at 15 percent O2 or 110 ng/J of useful output (0.86 lb/MWh).	Combustion turbines bypassing the heat recovery unit firing natural gas	>50 MMBtu/h	25 ppm at 15 percent O2 or 150 ng/J of useful output (1.2 lb/MWh).	Temporary turbine firing natural gas	≤850 MMBtu/h	25 ppm at 15 percent O2 or 150 ng/J of useful output (1.2 lb/MWh).	Temporary turbine firing fuels other than natural gas	≤850 MMBtu/h	74 ppm at 15 percent O2 or 460 ng/J of useful output (3.6 lb/MWh).

[91 FR 43565, July 16, 2026]