Puget Sound Energy (PSE) is an energy utility company based in the U.S. state of Washington that provides electrical power and natural gas to the Puget Sound region. The utility serves electricity to more than 1.1 million customers in Island, King, Kitsap, Kittitas, Pierce, Skagit, Thurston, and Whatcom counties, and provides natural gas to 750,000 customers in King, Kittitas, Lewis, Pierce, Snohomish and Thurston counties. The company's electric and natural gas service area spans . Facilities PSE's electric supplies include utility-owned resources as well as those under long-term contract, for a total capacity of 5,044 megawatts (MW). While PSE-owned generating capacity is at 3,597 MW. PSE owns coal, hydroelectric, natural gas and wind power-generating facilities, with more than 3,500 MW of capacity. In 2018, PSE's generation was 36% coal, 32% hydroelectric, 20% natural gas, and 10% wind derived. Less than one percent originated from other energy efficiency programs. Coal accounted for 36% of PSE's electricity fuel mix in 2018. PSE's partial ownership of Eastern Montana's Colstrip Generating Station represents the single largest power-generating facility PSE owns, approximately 700 MW of generating capacity. In 2010, the Colstrip Generating station was the 8th largest greenhouse gas emitter among power plants in the United States. Hydroelectricity generated 31% of PSE's power supply in 2016. The company operates three hydroelectric facilities: The Baker River Hydroelectric Project on the Baker River, generating 170 MW of electricity. Snoqualmie Falls Hydroelectric Plant, two power plants on the Snoqualmie River in King County, generating 44 MW. The Electron Hydroelectric Project on the Puyallup River in Pierce County generates 22 MW of electricity. Natural gas-fired power generation accounted for 22% of the utility's electricity fuel mix in 2016. The company operates these natural gas-fired facilities: The Sumas Generating Station in Whatcom County is a cogeneration natural gas-fired plant capable of generating 125 MW of electricity. The Ferndale Generating Station in Whatcom County is a combined-cycle natural gas-fired plant capable of generating 270 MW of electricity. The Encogen Generating Station in Whatcom County is a combined-cycle natural gas-fired plant capable of generating 167 MW of electricity. The Goldendale Generating Station in Klickitat County is a combined-cycle natural gas-fired plant capable of generating 277 MW of electricity. The Mint Farm Generating Station in Cowlitz County is a combined-cycle natural-gas-fired plant capable of generating 310 MW of electricity. The Fredonia Generating Station in Skagit County is a simple-cycle natural gas-fired plant capable