Avista Corporation operates as an electric and natural gas utility company. It operates in two segments, Avista Utilities, and Alaska Electric Light and Power Company. The Avista Utilities segment generates, transmits, and distributes electricity, as well as distributes natural gas in eastern Washington, northern Idaho, northeastern and southwestern Oregon, and Montana. This segment also engages in wholesale purchase and sales of electricity and natural gas. It owns hydroelectric, thermal, and wind generation facilities with a total capacity of 1,862 megawatts (MW). As of December 31, 2016, this segment supplied retail electric services to 377,000 customers and retail natural gas services to 340,000 customers. The Alaska Electric Light and Power Company segment owns and operates electric generation, transmission, and distribution facilities located in Juneau, Alaska. As of December 31, 2016, it operated five hydroelectric generation facilities with 102.7 MW of hydroelectric generation capacity; and had 107.5 MW of diesel generating capacity. This segment served approximately 17,000 customers, including city, state, and federal governmental entities located in Juneau, as well as a mine located in the Juneau area. The company also engages in the sheet metal fabrication of electronic enclosures, parts, and systems for the computer, construction, telecom, renewable energy, and medical industries; and investment of commercial and retail office space, as well as emerging technology venture capital funds. Avista Corporation was founded in 1889 and is headquartered in Spokane, Washington.