Four final rules from the EPA aim to reduce pollution from fossil fuel-fired power plants, protecting community health and fighting climate change.
The U.S. Environmental Protection Agency (EPA) announced a suite of final rules to reduce pollution from fossil fuel-fired power plants in order to protect all communities from pollution and improve public health without disrupting the delivery of reliable electricity. These rules, finalized under separate authorities including the Clean Air Act, Clean Water Act, and Resource Conservation and Recovery Act, will significantly reduce climate, air, water, and land pollution from the power sector. The standards are designed to work with the power sector’s planning processes, providing compliance timelines that enable power companies to plan in advance to meet electricity demand while reducing dangerous pollution.
The suite of final rules includes:
- A final rule for existing coal-fired and new natural gas-fired power plants that would ensure that all coal-fired plants that plan to run in the long-term and all new baseload gas-fired plants control 90 percent of their carbon pollution.
- A final rule strengthening and updating the Mercury and Air Toxics Standards (MATS) for coal-fired power plants, tightening the emissions standard for toxic metals by 67 percent and finalizing a 70 percent reduction in the emissions standard for mercury from existing lignite-fired sources.
- A final rule to reduce pollutants discharged through wastewater from coal-fired power plants by more than 660 million pounds per year, ensuring cleaner water for affected communities, including communities with environmental justice concerns that are disproportionately impacted.
- A final rule that will require the safe management of coal ash that is placed in areas that were unregulated at the federal level until now, including at previously used disposal areas that may leak and contaminate groundwater.
Stronger Carbon Pollution Standards for New Gas and Existing Coal Power Plants
EPA’s final Clean Air Act standards for existing coal-fired and new natural gas-fired power plants limit the amount of carbon pollution covered sources can emit, based on proven and cost-effective control technologies that can be applied directly to power plants. The regulatory impact analysis projects reductions of 1.38 billion metric tons of carbon pollution overall through 2047, which is equivalent to preventing the annual emissions of 328 million gasoline cars, or to nearly an entire year of emissions from the entire U.S. electric power sector. It also projects up to $370 billion in climate and public health net benefits over the next two decades.
The rule addresses existing coal-fired power plants, which continue to be the largest source of greenhouse gas emissions from the power sector, and ensures that new natural gas combustion turbines, some of the largest new sources of greenhouse gases being built today, are designed using modern technologies to reduce climate pollution.
The EPA projects that the climate and health benefits of this rule will substantially outweigh the compliance costs. In 2035 alone, the regulatory impact analysis estimates substantial health co-benefits including:
- Up to 1,200 avoided premature deaths
- 870 avoided hospital and emergency room visits
- 1,900 avoided cases of asthma onset
- 360,000 avoided cases of asthma symptoms
- 48,000 avoided school absence days
- 57,000 lost workdays
The final emission standards and guidelines will achieve substantial reductions in carbon pollution at reasonable cost. The best system of emission reduction for the longest-running existing coal units and most heavily utilized new gas turbines is based on carbon capture and sequestration/storage (CCS) – an available and cost-reasonable emission control technology that can be applied directly to power plants and can reduce 90 percent of carbon dioxide emissions from the plants.
To view the fact sheet for this rulemaking visit EPA’s Greenhouse Gas Standards and Guidelines for Fossil Fuel-Fired Power Plants webpage.
Strengthening Mercury and Air Toxics Standards
EPA is strengthening and updating the Mercury and Air Toxics Standards (MATS) for coal-fired power plants, achieving important hazardous air pollutant (HAP) emissions reductions and ensuring that the standards reflect the latest advancements in pollution control technologies. This final rule under the Clean Air Act is the most significant update since MATS was first issued in February 2012, building on highly successful and cost-effective protections.
EPA projects the final rule will reduce emissions of mercury and non-mercury metal HAPs, such as nickel, arsenic, and lead. Controlling these emissions from power plants improves public health for all Americans by reducing the risk of fatal heart attacks, cancer, developmental delays in children, and also reduces adverse environmental impacts. The final rule will also result in substantial co-benefits, including reductions in emissions of fine particulate matter (“soot”), sulfur dioxide, nitrogen oxides, and carbon dioxide nationwide. These public health improvements are especially important for children and communities with environmental justice concerns and others who regularly consume fish that accumulate high levels of pollutants from power plants.
The final rule reduces the mercury emissions limit by 70 percent for lignite-fired units and reduces the emissions limit that controls for toxic metals by 67 percent for all coal plants—while also requiring the use of continuous emission monitoring systems to provide real-time, accurate data to regulators, facility operators, and the public to ensure that plants are meeting these lower limits and that communities are protected year-round from pollution exposure.
EPA projects that the final MATS limits will result in the following emissions reductions in the year 2028:
- 1,000 pounds of mercury
- At least 7 tons of non-mercury HAP metals
- 770 tons of fine particulate matter (PM2.5)
- 280 tons of nitrogen oxides (NOx)
- 65,000 tons of carbon dioxide (CO2)
EPA’s final rule projects $300 million in health benefits and $130 million in climate benefits over the 10-year period from 2028-2037. Reductions in non-mercury HAP metal emissions are expected to reduce exposure to carcinogens such as nickel, arsenic, and hexavalent chromium, for residents living in the vicinity of these facilities.
To view the fact sheet for this rulemaking visit EPA’s Mercury and Air Toxics Standards webpage.
Stronger Limits on Water Pollution from Power Plants
EPA is strengthening wastewater discharge standards that apply to coal-fired power plants, finalizing a rule that follows the latest science and applies EPA’s longstanding authority under the Clean Water Act to reduce discharges of toxic metals and other pollutants from these power plants into lakes, streams, and other waterbodies. When implemented, this action will annually prevent more than 660 million pounds of pollution per year from being discharged to our nation’s waters—protecting freshwater resources that provide sources of drinking water for communities, support economic development, enhance outdoor recreation, and sustain vibrant ecosystems.
Power plants that burn coal to create electricity use large volumes of water. When this water is returned to lakes, streams, and other waterbodies it can carry pollutants, including mercury, arsenic, selenium, nickel, bromide, chloride, and iodide, and nutrient pollution. Exposure to these pollutants can harm people and ecosystems by contaminating drinking water sources, recreational waters, and aquatic life.
EPA’s final rule establishes technology-based discharge standards—known as Effluent Limitation Guidelines (ELGs)—that will apply to four types of wastewater:
- Flue gas desulfurization wastewater
- Bottom ash transport water
- Combustion residual leachate
- “Legacy wastewater” that is stored in surface impoundments (for example, coal ash ponds)
Following rigorous analysis, EPA has determined that this final rule will have minimal effects on electricity prices. EPA’s analysis shows that the final rule will provide billions of dollars in health and environmental benefits each year. These water quality, health, and environmental improvements will benefit environmental justice communities that are disproportionately affected by pollution from coal-fired power plants.
To view the fact sheet for this rulemaking visit EPA’s Steam Electric Power Generating Effluent Guidelines webpage.
Latest Action to Protect Communities from Coal Ash Contamination
Under the Resource Conservation and Recovery Act, EPA is finalizing a rule to protect communities and hold polluters accountable for controlling and cleaning up the contamination created by the disposal of coal combustion residuals (CCR or coal ash), which can cause serious public health risks. The agency is finalizing regulations that require the safe management of coal ash at inactive surface impoundments at inactive power plants and historical coal ash disposal areas.
Coal ash is a byproduct of burning coal in power plants that, without proper management, can pollute waterways, groundwater, drinking water, and the air. Coal ash contains contaminants like mercury, cadmium, chromium, and arsenic which are associated with cancer and various other serious health effects. EPA’s final rule expands protections for the communities and ecosystems near active and inactive coal burning power plants, ensuring that groundwater contamination, surface water contamination, fugitive dust, floods and impoundment overflows, and threats to wildlife are all addressed.
Inactive coal ash surface impoundments at inactive facilities, referred to as “legacy CCR surface impoundments,” are more likely to be unlined and unmonitored, making them more prone to leaks and structural problems than units at facilities that are currently in service. To address these concerns, EPA established safeguards for legacy coal ash surface impoundments that largely mirror those for inactive impoundments at active facilities, including requiring the proper closure of the impoundments and remediating coal ash contamination in groundwater. EPA analysis shows the final rule will reduce existing disproportionate and adverse effects on communities with environmental justice concerns.
In addition, through implementation of the 2015 CCR rule, EPA found “historic” disposal units that are leaking and contaminating groundwater at currently regulated power plants, but which were exempt under the original 2015 regulations. These are areas where coal ash was placed directly on the land, such as coal ash in surface impoundments and landfills that closed prior to the effective date of the 2015 CCR Rule and inactive CCR landfills. This final rule extends a subset of EPA’s existing CCR requirements to these historic disposal units that will ensure any contamination from these areas is remediated, and will prevent further contamination. These requirements will apply to all active CCR facilities and inactive facilities with legacy CCR surface impoundments.
EPA does not expect this rule to affect the current operations of power plants, and therefore anticipates no impacts to electricity generation or grid reliability. This rule reflects the Administration’s commitment to reduce pollution from the power sector while providing long-term regulatory certainty and operational flexibility.
To view the fact sheet for this rulemaking visit EPA’s Legacy Coal Combustion Residuals Surface Impoundments and CCR Management Units webpage.
