Hydropower

Built in 1925, the 12-megawatt Mystic facility is on West Rosebud Creek in the Beartooth Mountains, 75 miles southwest of Billings, Montana. It is one of 10 hydroelectric facilities and one storage reservoir we operate. We work to produce safe, reliable energy to light homes and businesses across Montana.

First built in 1915, the Thompson Falls dam is a seven-unit hydroelectric plant on the Clark Fork River in Thompson Falls, Montana. NorthWestern Energy owns and operates the dam, along with 10 others across the state. The energy produced and collected at these dams allows us to provide clean, sustainable energy to meet our customers’ needs. NorthWestern Energy values being a good steward of the resources at our projects and works to protect and enhance the fish and wildlife resources around our sites.

The purpose of this site is to provide information on NorthWestern Energy’s ongoing resource stewardship programs implemented in the 525 mile river corridor from West Yellowstone to Fort Peck Reservoir.