GREAT FALLS — Sunday, August 24 is National Hydropower Day. Nearly 35% of electricity for Northwestern Energy customers in Montana comes from hydropower, contributing to the state's impressive renewable energy portfolio where more than 60% of energy comes from carbon-free sources.

Northwestern Energy, Montana's largest utility, owns and operates 11 hydroelectric facilities across the state, including Hauser and Holter in Lewis and Clark County and five dams in Cascade County: Black Eagle, Cochrane, Morony, Ryan and Rainbow.

Tim McGonigal reports - watch: Montana hydropower provides reliable, carbon-free energy for customers

"If the wind quits blowing or the sun quits shining, hydro kind of shines and you know the water is going to be there," said Jerry Gray, superintendent of hydrop

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