Scores of Coal-Fired Power Plants Exempted From Rules by Trump

The dirtiest coal-fired power plant in the US and dozens of others are being exempted from stringent air pollution mandates as part of US President Donald Trump’s bid to revitalize the industry.

Talen Energy Corp.’s Colstrip in Montana is among 47 plants receiving two-year waivers from rules to control mercury and other pollutants as part of a White House effort to ease regulation on coal-fired sites, according to a list seen by Bloomberg News.

The exemptions were among a slew of actions announced by the White House Tuesday to expand the mining and use of coal. The Trump ...