BILLINGS, Mont. (AP) — A Washington state electric utility has signed a contract to purchase hydroelectric power from a Montana tribal company. The Billings Gazette reports Puget Sound Energy Inc. in Washington signed the 15-year contract to draw power from a project operated by Energy Keepers Inc., owned by the Confederated Salish and Kootenai Tribes in Montana. The tribal hydroelectric project including a Flathead River dam will provide Puget with 40 megawatts of power. The deal will supplant Puget’s delivery of coal-fired electricity from Montana’s Colstrip Power Plant after 2025. Energy Keepers began supplying Puget customers with energy in March.