Meghan Hodges
Power plants are a major source of air and water pollution, and their emissions have devastating effects on health, air quality, and the economy. In recent years, the Environmental Protection Agency (EPA) has unveiled several strategies and regulations to reduce pollution from power plants. These include the Mercury and Air Toxics Standards, which have successfully reduced pollutants such as mercury, sulfur dioxide, and particulate matter. The EPA has also proposed rules aimed at reducing emissions from vehicles, heavy trucks, and buses, with the goal of improving air quality and saving billions of dollars in healthcare costs. Additionally, the EPA has targeted power plants' NOx emissions, which contribute to ground-level ozone formation and violate the National Ambient Air Quality Standard. While progress has been made, there is still a need for further research and the implementation of advanced control techniques to reduce the environmental impact of power plants, particularly those fueled by coal.
| Characteristics | Values |
|---|---|
| Mercury and Air Toxics Standards | Reduce mercury, sulfur dioxide, and particulate matter |
| EPA's Clean Air Act | Reduce air pollution, especially from fossil fuel power plants |
| Installation of scrubbers | Remove unwanted chemicals from smokestacks |
| SSM rule | Ensure power plants use up-to-date emissions control technologies |
| NOx reduction | Target ozone-forming NOx emissions from power plants and industrial polluters |
| Energy-efficient technologies | Improve thermal efficiency and reduce coal usage |
| Carbon-neutral fuels | Reduce environmental impact |
| Multi-Pollutant Power Plant Strategy | Reduce all forms of power plant pollution |
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What You'll Learn
The EPA's Mercury and Air Toxics Standards
The Mercury and Air Toxics Standards (MATS) are regulations set by the Environmental Protection Agency (EPA) to limit the emissions of hazardous air pollutants, such as mercury, arsenic, benzene, and cadmium, released by coal- and oil-fired power plants. These power plants emit mercury, which is linked to brain damage in children and heart disease in adults, as well as cancer-causing arsenic, chromium, and nickel.
For decades, coal- and oil-burning power plants avoided restrictions on hazardous air pollution, despite the Clean Air Act's regulations. In 2012, after nearly 20 years of litigation by Earthjustice and other organizations, the EPA finally required power plants to control their hazardous air pollution under the new MATS. Power plants then began drastically reducing mercury and other air pollution linked to serious illnesses, including cancer and heart disease.
The implementation of MATS has achieved significant health and environmental benefits. By 2017, mercury emissions had dropped by 86%, acid gas HAP by 96%, and non-mercury metals by 81% compared to 2010 levels. MATS is estimated to have saved over 160,000 lives, with nearly 50,000 of those being from coal pollution reductions alone. Additionally, it has prevented almost 80,000 heart attacks and saved billions in healthcare costs.
Despite the success of MATS, the EPA has considered proposals to weaken the standards, particularly for waste coal plants. These proposals have been widely criticized by health, faith, and environmental organizations, as well as clean energy companies and power plant operators. Weakening MATS would result in significant harm to public health, especially for children.
To further protect Americans' health and the environment, the EPA should strengthen the baseline mercury standards for all coal-fired power plants. Continuous emissions monitoring systems are essential to ensure compliance with the standards and improve environmental enforcement.
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Scrubbers and other pollution control technology
Scrubbers are devices that reduce harmful pollution emitted from industrial processes such as burning coal. They work like giant filters, removing over 90% of flue gases emitted by a coal exhaust. The use of scrubbers has been instrumental in driving down specific types of air pollution, and their installation in 472 coal-burning power plants has been linked to a reduction in hospitalisations for Ischemic Heart Disease (IHD) among people aged 65 and above.
In the United States, scrubbers are primarily used in coal plants to remove sulfur emissions and mitigate the formation of acid rain. These scrubbers are large towers that spray aqueous mixtures of lime or limestone absorbers through the flue gases exiting a coal boiler. The lime or limestone absorbs sulfur, resulting in lower sulfur emissions than standard coal plants. However, these scrubbers come at the cost of increased plant complexity and the need for more maintenance.
The deployment of scrubbers has been influenced by regulations and incentives. The history of sulfur dioxide scrubbers in the US illustrates this point. Emission regulations beginning in 1971 spurred the widespread use of scrubbers, and over time, scrubber costs decreased by half while their effectiveness in removing sulfur dioxide increased significantly.
In addition to scrubbers, other pollution control technologies are also employed in power plants. For example, the Mercury and Air Toxics Standards have been successful in reducing pollutants like sulfur dioxide and particulate matter from power plants. These standards have been strengthened over time, addressing cancer-causing toxics and requiring continuous monitoring of key toxic pollutants.
The Environmental Defense Fund (EDF) and Bloomberg Philanthropies' Beyond Carbon initiative have played a pivotal role in urging protections against pollution from coal and gas plants. Their efforts have resulted in significant reductions in coal pollution, saving lives, preventing heart attacks, and reducing healthcare costs.
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The EPA's Multi-Pollutant Power Plant Strategy
Power plants are the United States' biggest industrial polluters, threatening the health of millions. In 2023, the Environmental Protection Agency (EPA) launched a multi-pollutant strategy to curb air, water, and land pollution.
The EPA's strategy includes new standards to reduce climate pollution from new gas-burning power plants and existing coal-burning power plants. Fossil fuel-fired power plants are responsible for about a quarter of the nation's total carbon pollution, which causes climate change and leads to more heatwaves, wildfires, severe storms, flooding, and rising sea levels. The EPA's final Clean Air Act standards limit the amount of carbon pollution covered sources can emit, based on proven and cost-effective control technologies that can be directly applied to power plants.
The EPA's strategy also strengthens the Mercury and Air Toxics Standards (MATS), a successful clean air program limiting dangerous smokestack pollutants. Coal-fired power plants emit mercury, which is linked to brain damage in children and heart disease in adults, as well as cancer-causing arsenic, chromium, and nickel. The EPA's new rules tighten the emissions standard for toxic metals by 67% and finalize a 70% reduction in the emissions standard for mercury from existing lignite-fired sources.
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The EPA's Good Neighbor Rule
The Environmental Protection Agency's (EPA) Good Neighbor Rule is intended to restrict smokestack emissions from power plants and other industrial sources that burden downwind areas with smog-causing pollution. The rule aims to reduce interstate ozone pollution or smog, improving air quality in downwind states.
The wind can carry pollutants emitted by states to other states, making it difficult for those states to meet the national air quality standards set by the EPA. The Good Neighbor Rule ensures that all states play their part in reducing air pollution, not just for their own benefit but for the benefit of their neighbors as well. The EPA identified 23 states, including Ohio, Indiana, and West Virginia, as significant contributors to cross-border ozone pollution.
The rule was challenged by three energy-producing states, along with the steel industry and other groups, who called it costly and ineffective. The Supreme Court put the rule on hold while legal challenges continue, with the court's conservative majority reining in the powers of federal agencies, including the EPA, in recent years.
The Supreme Court's decision blocks the EPA's enforcement of the rule, sending the case back to the U.S. Court of Appeals for the District of Columbia Circuit. The EPA spokesman stated that the agency believes the plan is firmly rooted in its authority under the Clean Air Act and is committed to defending this vital public health protection.
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Energy-efficient technologies and carbon-neutral fuels
Power plants have been adopting energy-efficient technologies and carbon-neutral fuels to reduce pollution. These technologies and fuels offer a more sustainable and environmentally friendly approach to power generation, helping to mitigate climate change and reduce the cost of power production.
One example of an energy-efficient technology is the use of "scrubbers" in smokestacks, which pull unwanted chemicals out of the emissions, thereby reducing air pollution. Another technology is carbon capture, which can be applied to carbon-neutral fuels to achieve net-negative carbon dioxide emissions, constituting a form of greenhouse gas remediation. Carbon-neutral fuels, such as synthetic fuels and biofuels, are made using carbon dioxide as feedstock, and they offer a versatile and sustainable solution for power generation and various transportation modes.
Synthetic fuels are produced by chemically hydrogenating carbon dioxide, which can be captured from power plant emissions or the air. Common examples include ammonia and methane, and more complex hydrocarbons like gasoline and jet fuel. Biofuels, on the other hand, are produced using natural CO2-consuming processes like photosynthesis. Examples of biofuels include bioethanol, made from various plant materials, and biodiesel, made from renewable energy sources like animal fats and vegetable oils.
Carbon-neutral fuels have diverse applications and can be used in electricity generation, powering vehicles, and industrial processes. They play a vital role in sustainable energy production, offering a cleaner alternative to traditional internal combustion engines. Additionally, they can be utilized in the agricultural sector, with biofuels powering farm machinery and vehicles, contributing to a greener farming practice.
To further enhance energy efficiency, power plants can also focus on optimizing their efficiency rates and costs. Hydro plants, for instance, have a high efficiency rate of 90%, while wind power plants operate between 35% and 47% efficiency, and solar power plants are at roughly 22% efficiency as of 2025. Nuclear power, despite being inexpensive to generate, lacks flexibility as it operates at a constant rate regardless of electricity demand.
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Frequently asked questions
Power plants can reduce pollution by implementing new technologies and adhering to EPA regulations. For example, Duke Energy, which operates its biggest power plant near Evansville, installed scrubbers that pull unwanted chemicals out of smokestacks, reducing emissions.
The EPA has unveiled a suite of protections to address power plant pollution, including the Mercury and Air Toxics Standards, which limit dangerous smokestack pollutants. The EPA is also proposing a new Good Neighbor Rule to keep states in compliance with the 2015 ozone standard and reduce pollution that travels across state lines.
Reducing power plant pollution has several benefits, including improved public health, reduced healthcare costs, and a cleaner and more reliable electric grid. For example, coal pollution reductions are estimated to have saved almost 50,000 lives, prevented almost 80,000 heart attacks, and saved billions in healthcare costs.
