carbon pollution standard
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 upcoming 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.
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:
- Q&A on EPA Greenhouse Gas Standards for Existing Power Plants (Updated August 2015)
- Map: State emission rate targets (August 2015)
- Q&A on EPA Greenhouse Gas Standards for New Power Plants (Updated August 2015)
- Q&A: EPA's Federal Implementation Plan
- Report: Canadian Hydropower and the Clean Power Plan (April 2015)
- Brief: Modeling EPA's Clean Power Plan: Insights for Cost-Effective Implementation (May 2015)
- Bob Perciasepe's Statement on the Clean Power Plan
- Blog Post: EPA’s Clean Power Plan puts states in the driver’s seat
- Graphic: Policy options to reduce carbon emissions in the power sector (June 2014)
- Map: Renewables in the Clean Power Plan (June 2014)
- Map: Energy efficiency in the Clean Power Plan (August 2014)
- Blog: 5 Ideas for EPA's Clean Power Plan (December 2014)
- C2ES Comments on Proposed EPA Rule for Existing Power Plants (December 2014)
- C2ES Comments on Proposed EPA Rule for New Power Plants (May 2014)
- Brief: Cross-State Electricity Load Reductions Under EPA's Proposed Clean Power Plan (November 2014)
- Cornerstone Article: Carbon Pollution Standards for New and Existing Power Plants and Their Impact on Carbon Capture and Storage (September 2014)
- Event: Carbon Pricing: State and Federal Options (May 2014) See video of the event, and presentations by Dallas Butraw, David Bookbinder, Brian Turner, and Jon Brekke
- Jonas Monast et al., Enhancing Compliance Flexibility under the Clean Power Plan: A Common Elements Approach to Capturing Low-Cost Emissions Reductions (Durham, NC: Nicholas Institute for Environmental Policy Solutions, 2015).
- U.S. Environmental Protection Agency, Carbon Pollution Standards webpage.
- Presidential Memorandum – Power Sector Carbon Pollution Standards
- Megan Ceronsky and Tomas Carbonell, Section 111(d) of the Clean Air Act: The Legal Foundation for Strong, Flexible & Cost-Effective Carbon Pollution Standards for Existing Power Plants (Washington, DC: Environmental Defense Fund, 2013).
- Samuel D. Eisenberg, Michael Wara, Adele Morris, Marta R. Darby and Joel Minor, A State Tax Approach to Regulating Greenhouse Gases Under the Clean Air Act (Washington, DC: Climate and Clean Energy Economics Project at Brookings, 2014).
- Georgetown Climate Center, Carbon Pollution Standards for Existing Power Plants: State Opportunities and Potential Benefits (Washington, DC: Georgetown Climate Center, 2013).
- Daniel Lashof et al., Closing the Power Plant Carbon Pollution Loophole: Smart Ways the Clean Air Act Can Clean Up America’s Biggest Climate Polluters (Washington, DC: Natural Resource Defense Council, 2013).
- Daniel Lashof and Starla Yeh, Cleaner and Cheaper: Using the Clean Air Act to Sharply Reduce Carbon Pollution from Existing Power Plants, Delivering Health, Environmental, and Economic Benefits (Washington, DC: Natural Resource Defense Council, 2014).
- Jonas Monast et al., Regulating Greenhouse Gas Emissions From Existing Sources: Section 111(d) and State Equivalency, 42 Environmental Law Reporter 10206 (Washington, DC: Environmental Law Institute, 2012).
- James McCarthy, “EPA Standards for Greenhouse Gas Emissions from Power Plants: Many Questions, Some Answers.” Congressional Research Service (CRS). R43127. November 15, 2013.
- Stephen Munro, EPA's Clean Power Plan: 50 chefs stir the pot (Washington, DC: Bloomberg New Energy Finance, 2014).
- National Conference of State Legislatures, States Reactions to Proposed EPA Greenhouse Gas Emissions Standards webpage.
- Conrad Schneider, Power Switch: An Effective, Affordable Approach to Reducing Carbon Pollution from Existing Fossil-Fueled Power Plants (Boston, MA: Clean Air Task Force, 2014).
- Robert Sussman, Power Plant Regulation under the Clean Air Act: A Breakthrough Moment for US Climate Policy? (Charlottesville, VA: Virginia Environmental Law Journal, 2014).
- Jeremy M. Tarr, Jonas Monast, and Tim Profeta, Regulating Carbon Dioxide under Section 111(d) of the Clean Air Act: Options, Limits, and Impacts (Durham, NC: Nicholas Institute for Environmental Policy Solutions, 2013).
- Gregory E. Wannier et al., Prevailing Academic View on Compliance Flexibility under § 111 of the Clean Air Act, RFF Discussion Paper 11-29 (Washington, DC: Resources for the Future, 2011).
- Dallas Burtraw et al., State and Regional Comprehensive Carbon Pricing and Greenhouse Gas Regulation in the Power Sector under EPA’s Clean Power Plan: Workshop Summary (Washington, DC: Resources for the Future, 2015).
- Franz Litz and Jennifer Macedonia, Policy Pathways for States under the Clean Power Plan (Washington, DC: Bipartisan Policy Center, 2015)
- Karen Palmer and Anthony Paul, A Primer on Comprehensive Policy Options for States to Comply with the Clean Power Plan, RFF Discussion Paper 15-15 (Washington, DC: Resources for the Future, 2015).
- U.S. Energy Information Administration, Analysis of the Impacts of the Clean Power Plan (Washington, DC: U.S. Energy Information Administration, 2015)
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.