The United States has the most stringent air pollution regulations in the world.  In the United States, if a company plans to build a new gas fired power plant or modify an existing one, then it must obtain a New Source Review (NSR) permit. These permits assign limits to emissions from combustion turbines.

The US Environmental Protection Agency (EPA) keeps a searchable database of NSR permits of all plants constructed since January 1, 2010.  A search by pollutant (NOx) for categories such as large natural gas combustion turbines gives all NOx limits for each plant built in the US over the past 10 years.  The EPA Permit Database

The following table, which we will continue to add to, shows the typical limits imposed on actual projects by State authorities for NOx and ammonia slip in a variety of states.

EnergyLink’s team has been designing, manufacturing and installing air pollution control equipment to reduce NOx emissions from combustion turbines in the United States since 2000, and has designed the most effective control to date in the industry.

Case-by-Case (RACT/BACT/LAER) for Combustion Turbines

State NOx Ammonia Slip*
New York 2 ppmvdc 5 ppmvdc
New Jersey 2-2.5 ppmvdc 5 ppmvdc
Maryland 2-2.5 ppmvdc 5 ppmvdc
Delaware 2.0 ppmvdc 5 ppmvdc
West Virginia 2.0 ppmvdc 5 ppmvdc
Pennsylvania 2.0 ppmvdc (ng) 6.0 ppmvdc (oil) 5 ppmvdc
Ohio 2.0 ppmvdc 5 ppmvdc
Kentucky 2-15 ppmvdc N/A
Texas 2 ppmvdc (cc) 9 ppm vdc (sc) 7-10 ppmvdc
Louisiana 2 ppmvdc (cc) 9 ppm vdc (sc) N/A

Note: While ammonia is the reagent used to neutralize NOx molecules within the gas stream, leakage of ammonia is undesirable and must be kept to a safe limit.

sc = simple cycle
cc = combined cycle
RACT = Reasonably Available Control Technology, is required on existing sources in areas that are not meeting national ambient air quality standards (i.e., non-attainment areas).
BACT = Best Available Control Technology, is required on major new or modified sources in clean areas (i.e., attainment areas).
LAER = Lowest Achievable Emission Rate, is required on major new or modified sources in non-attainment areas.