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Puget Sound Energy

Puget Sound Energy, Inc. (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 1.24 million customers in Island, King, Kitsap, Kittitas, Pierce, Skagit, Thurston, and Whatcom counties, and provides natural gas to 881,000 customers in King, Kittitas, Lewis, Pierce, Snohomish and Thurston counties. The company's electric and natural gas service area spans 6,000 square miles (16,000 km2).

As of December 31, 2024, PSE's electric supplies include utility-owned resources as well as those under long-term contract, for a total capacity of approx. 6,524 megawatts (MW), of which 3,339 is PSE-owned generating capacity.

As of 2023, PSE's generation was 30% hydroelectric, 30% natural gas, 22% wind, and 18% coal derived. Less than one percent originated from other energy efficiency programs.

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. In 2019, the Washington Clean Energy Transformation Act mandated that all power utilities remove coal from their generation mix, including "coal by wire" from out of state. As of May 2024, PSE has proactively removed coal from its portfolio by choosing not to purchase energy generated from the Colstrip plant. It intends to sell its 25% stake in the Colstrip plant, but plans to do so have repeatedly fallen through.

Hydroelectricity generated 31% of PSE's power supply in 2016. The company operates three hydroelectric facilities:

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:

Wind power and other generation sources, such as biomass and landfill gas, account for 1% of the utility's electricity fuel mix. PSE owns and operates these wind-power facilities:

Coal-fired power is a major contributor to PSe's fuel mix at 36% of PSE's 2018 electricity generation sources, the largest share in 2018. The company owns a stake of the Colstrip Unit 3 coal power plant in eastern Montana.

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