Avista Corporation is a US electric and natural gas utility operating through two segments: Avista Utilities and Alaska Electric Light and Power Company (AEL&P). Avista Utilities provides electric distribution and transmission and natural gas distribution and transmission in parts of eastern Washington, northern Idaho, and northeastern and southwestern Oregon, generates electricity in Washington, Idaho, Oregon, and Montana, supplies electricity in Montana, and engages in wholesale electricity and natural gas purchase and sale. AEL&P offers electric services in Juneau, Alaska. The company generates electricity through hydroelectric, thermal, wind, and solar facilities; as of December 31, 2025, it served approximately 429,000 retail electric customers, 386,000 retail natural gas customers, and 17,600 electrical energy customers. It operates five hydroelectric facilities with 102.7 MW of capacity and four diesel generating facilities with 107.5 MW of capacity, and also engages in venture fund, real estate, and other investments. Formerly known as Washington Water Power, it changed its name to Avista Corporation in January 1999, was incorporated in 1889, and is headquartered in Spokane, Washington.