Carbon Pollution Standards Map

In its final rule (Clean Power Plan) to reduce carbon dioxide emissions in the power sector, EPA has set a unique target emissions rate for each state to achieve by 2030. Targets are based on the “best system of emission reduction” (BSER), which use three “building blocks” or potential pathways to cost-effectively and efficiently reduce CO2 emissions:

  1. Make coal-fired power plants more efficient;
  2. Shift generation from existing fossil steam plants to existing natural gas combined cycle plants (NGCC) up to a maximum utilization of 75 percent; and
  3. Use more zero-emission renewable power, including onshore wind, utility-scale solar photovoltaic (PV) and concentrating solar power (CSP), geothermal and hydropower.

State Target Calculation Steps

To calculate a state’s target, EPA first determined a CO2 emissions baseline (using 2012 data) based on each state’s level of CO2 emissions from fossil-fired power plants divided by its total fossil-fired electricity generation (including coal steam plants, oil and natural gas steam plants and natural gas combined cycle plants). Next, the state level data was aggregated to the regional level (Eastern, Western and Texas Interconnections). Then, “emission performance rates” were established for years 2022-2030 for two subcategories of existing fossil-fired power plants (1) fossil steam (generally, coal-fired plants), and (2) natural gas combined cycle units, based on the capacity of each region to achieve reductions using the identified building blocks.

Finally, state target emission rates (pounds of CO2 per megawatt-hour of electricity generated) were calculated based on a weighted average of the states’ baseline fossil fuel mix (percentage of fossil steam and natural gas combined cycle plant generation) and the two emission performance rates (see sample calculation below).

In 2030, the emission performance rate for all fossil steam plants was determined to be 1,305 lb CO2/MWh, and the emission performance rate for all natural gas combined cycle plants was calculated to be 771 lb CO2/MWh. All state target emission rates in 2030 fall between these two values.

Sample calculation for Alabama

State target (weighted average) = (% fossil steam generation in 2012 x fossil steam plant rate in 2030) + (% natural gas combined cycle generation in 2012 x natural gas combined cycle plant rate in 2030)

In Alabama in 2012, total fossil generation was 46 percent from fossil steam generation and 54 percent from natural gas generation, therefore

Alabama state target CO2 emissions rate in 2030 (lbs CO2/MWh) = (0.46 * 1,305) + (0.54 * 771) = 1,018 lb CO2/MWh

Each state can meet its established target however it sees fit, and does not need to leverage each building block to the extent that EPA projects. The EPA has also converted state target emissions rates to a mass-based standard (tons of CO2 emitted per year) to better enable trading of carbon pollution credits.