epa ghg regulations
Carbon Pollution Standards
The U.S. Environmental Protection Agency (EPA) issued final rules in August 2015 to limit carbon pollution from existing and new power plants. Electric power generation accounts for 40 percent of U.S. carbon emissions, making it the largest source.
Reducing power sector emissions is a key part of President Obama’s Climate Action Plan, which aims to reduce overall U.S. greenhouse gas emissions 17 percent below 2005 levels by 2020. In addition, the U.S. contribution to the international climate agreement in Paris sets an economy-wide target of reducing greenhouse gas emissions by 26-28 percent below 2005 levels by 2025.
Under the Clean Power Plan for existing power plants, each state has its own target (due to regional variation in generation mix and electricity consumption). Overall, the rule is designed to cut emissions 32 percent from 2005 emission levels by 2030.
In February 2016, the U.S. Supreme Court issued a stay halting implementation of the Clean Power Plan while a legal challenge is resolved in a lower court. Some states may suspend their planning efforts, given the court’s stay, but others will press on with preparations. If the plan is ultimately upheld, the implementation timeline may have to be extended.
EPA's “Carbon Pollution Standard for New Power Plants” finalizes a standard first proposed in March 2012 that was modified and proposed again in September 2013. States would apply the standards for new coal- and natural gas-fired plants (measured as tons of greenhouse gas emissions per megawatt-hour of electricity produced) at each regulated plant.
Explore the issues and options involved in reducing carbon pollution from power plants through the following resources:
C2ES Resources on the Clean Power Plan
- Q&A on the Clean Power Plan, EPA Greenhouse Gas Standards for Existing Power Plants (Updated February 2016)
- Statement: Bob Perciasepe on the Supreme Court stay of the Clean Power Plan
- Map: State emission rate targets
- Clean Power Plan Timeline
- Q&A: EPA's Federal Implementation Plan
- Blog Post: EPA’s Clean Power Plan puts states in the driver’s seat
- C2ES comments on the Clean Power Plan
C2ES Resources on the Clean Energy Incentive Program
- Fact Sheet: The Clean Power Plan's Clean Energy Incentive Program (CEIP)
- Key Insights from Stakeholders on the Clean Energy Incentive Program
- C2ES comments on the Clean Power Plan's Clean Energy Incentive Program
- C2ES Comments on Proposed EPA Rule for New Power Plants (May 2014)
- Cornerstone Article: Carbon Pollution Standards for New and Existing Power Plants and Their Impact on Carbon Capture and Storage
- Event: Carbon Pricing: State and Federal Options (May 2014)
See presentations by Dallas Butraw, David Bookbinder, Brian Turner, and Jon Brekke
- U.S. Environmental Protection Agency, Carbon Pollution Standards web page.
- U.S. Environmental Protetction Agency, Clean Power Plan Toolbox for States
- Presidential Memorandum, Power Sector Carbon Pollution Standards
Two years after President Obama announced his Climate Action Plan, the administration has taken at least initial steps on all 75 of its goals, according to a new C2ES status report.
The Climate Action Plan aims to reduce overall U.S. greenhouse gas emissions 17 percent below 2005 levels by 2020. While some steps in the plan are simple and within existing policies and programs, achieving some of the plan’s goals will require a transformation of the U.S. energy system over a period that will outlast President Obama’s time in office.
Federal and state measures beyond those in the plan will be needed to achieve the U.S. pledge to achieve a 26 to 28 percent reduction in U.S. emissions by 2025 as part of the effort to reach an international climate agreement.
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:
- Make coal-fired power plants more efficient;
- Shift generation from existing fossil steam plants to existing natural gas combined cycle plants (NGCC) up to a maximum utilization of 75 percent; and
- 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.