NorthWestern Energy had to buy more expensive power during a cold snap, costing ratepayers, and Montana's Public Service Commission wants to know why.

At Lame Deer, the road bends northeast through hills cut by Rosebud Creek, until suddenly coming over a rise to reveal the four smokestacks of Colstrip’s coal-fired power plant. It’s harder to ...

The Trump administration plans to overturn pollution rules that seek to reduce soot emissions from U.S. coal-fired power plants in a move that ...

The country's dirtiest coal plants would be among the biggest beneficiaries from a rollback of the soot limits. They include the Colstrip power plant in Montana, which the EPA says is the nation's ...