Sara Edinberg

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.

Jackie Yamanaka / Yellowstone Public Radio

Talen Energy is proposing to install more wells to flush out and capture underground water reserves that were polluted by coal ash dumped into leaky holding ponds at eastern Montana's Colstrip power plant.

Jackie Yamanaka / Yellowstone Public Radio

The state expects to release final details of plans to clean up groundwater contaminated by toxic coal ash at the Colstrip power plant next month.