A new wastewater rule authorized by the U.S. Environmental Protection Agency (EPA) earlier this year is leading several coal-fired plants to announce closure plans, according to an analysis of state regulatory filings by the Sierra Club.

The group said at least 26 plants in 14 states have said they will stop burning coal, with 21 facilities closing and another five switching to natural gas-fired generation, according to a report published Nov. 22 by the Associated Press. The EPA has said it expects the rule would impact about 75 coal-fired plants across the country.  

The EPA in July announced it would reinstate Obama-era regulations on wastewater that were rolled back by the Trump administration. The new wastewater rule requires power plants to clean coal ash and toxic heavy metals such as mercury, arsenic, and selenium from plant wastewater before it is discharged into streams and rivers.

Coal-fired power plants had an October deadline to tell their state regulators how they planned to comply with the rule.…

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