By Amanda Eggert, Montana Free Press
Red states, energy industry groups had asked for SCOTUS intervention in a new rule targeting coal plant emissions

The Colstrip power plant and ash ponds, photographed in 2019. Credit: Alexis Bonogofsky / MTFP
A federal regulation that has major implications for the continued operation of Montana’s largest coal-fired power plant in Colstrip remains in effect as the U.S. Supreme Court declined to take immediate action on a legal challenge.