BY EMMANUEL OGBONNA
The Environmental Protection Agency on Friday formally weakened federal limits on mercury and other hazardous air pollutants emitted by coal- and oil-fired power plants, marking a significant regulatory shift that administration officials say will bolster the fossil fuel sector and reduce compliance costs for utilities.
The agency announced the repeal of stricter updates to the Mercury and Air Toxics Standards, commonly known as MATS, during an event held at the Mill Creek Generating Station, a sprawling coal-fired facility along the Ohio River in Louisville, Kentucky. The revised rule returns emission requirements to standards first established in 2012.
EPA Deputy Administrator David Fotouhi said the move restores what he described as the “highly effective original” framework and reverses what officials characterize as excessive regulatory tightening under the previous administration. According to the agency, rolling back the updated requirements will save the power sector hundreds of millions of dollars in compliance expenses.
The Mercury and Air Toxics Standards were initially implemented during the Obama administration and credited with driving a sharp reduction in mercury emissions from coal-fired power plants — nearly 90% over the past decade. The Biden administration had moved to tighten those standards further, arguing that advances in pollution-control technology made additional reductions feasible and necessary to protect public health.
Coal- and oil-fired power plants are the largest single human-generated source of mercury pollution in the United States. Mercury released into the atmosphere eventually settles into waterways, where it accumulates in fish and other aquatic life. Humans are primarily exposed through consumption of contaminated fish. Health experts have long warned that mercury exposure can impair neurological development in children and contribute to cardiovascular disease and other serious health problems in adults.
Environmental organizations condemned the rollback, arguing that stricter standards had improved air quality and reduced health risks in communities located near power plants. They contend that easing the requirements could slow progress in reducing toxic pollution and increase exposure in vulnerable populations.
Industry representatives, however, have maintained that the tightened standards imposed disproportionate financial burdens on aging coal plants already facing economic pressure from low-cost natural gas and rapidly expanding renewable energy sources. They argue that cumulative environmental regulations over the past decade accelerated plant retirements and undermined grid reliability.
Michelle Bloodworth, chief executive officer of the coal industry group America’s Power, said the repeal of the updated MATS rule is a critical step toward ensuring affordable and dependable electricity. She asserted that excessive regulatory requirements had placed the coal supply chain under sustained pressure and risked forcing viable plants offline prematurely.
The policy shift comes amid a broader deregulatory campaign at the EPA. In March, the agency described a package of environmental rollbacks as the most sweeping deregulatory initiative in U.S. history. EPA Administrator Lee Zeldin said at the time that the administration was ending what he called burdensome climate-focused policies and restoring balance to federal oversight.
Among the actions taken in recent months, the EPA has extended compliance deadlines for dozens of coal-fired power plants under certain Clean Air Act provisions and signaled plans to scale back greenhouse gas reporting requirements. The administration has also revoked a long-standing scientific determination that climate change poses a threat to public health — a finding that had underpinned federal authority to regulate carbon emissions.
Beyond regulatory changes, the administration has issued emergency orders to delay or halt the scheduled closure of several coal plants. Officials argue that coal facilities provide stable baseload electricity during extreme weather events and periods of peak demand, particularly as electricity consumption rises sharply due to the expansion of large-scale data centers and other energy-intensive infrastructure.
Critics counter that renewable energy sources, including wind and solar, have become increasingly cost-competitive and can provide reliable power when combined with storage and grid modernization. They warn that preserving coal generation could increase long-term costs for consumers and prolong emissions of both greenhouse gases and conventional pollutants.
Gina McCarthy, who led the EPA under former President Barack Obama, criticized the rollback, arguing that weakening mercury limits threatens public health gains achieved over the past decade. She said the decision prioritizes support for a declining industry over protections for children and communities affected by industrial pollution.
Despite coal’s diminished role in the U.S. energy mix over the past decade, the industry’s political and economic significance has seen renewed attention in the past year. The administration has framed coal as an essential component of energy security and grid resilience, particularly as electricity demand increases.
Whether the revised standards will materially slow the decline of coal generation remains uncertain. Market forces — including fuel costs, renewable energy expansion, and state-level climate policies — continue to shape the sector’s trajectory. But Friday’s decision signals a clear federal policy shift, positioning regulatory relief and fossil fuel support as central pillars of the administration’s energy agenda.
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