coal ash

Coal stacks at Colstrip Power plant
Kayla Deroches / Yellowstone Public Radio


A Montana agency on Feb. 11 released a cleanup plan for waste ponds at two of the Colstrip power plant’s four units.

Alexis Bonogofsky

Coal power plants in Wyoming and Montana are among those contaminating groundwater, as are most all coal plants, according to a new report from the Environmental Integrity Project and Earthjustice.