Avista Corporation, together with its subsidiaries, operates as an electric and natural gas utility company. It operates in two segments, Avista Utilities and AEL&P. The Avista Utilities segment provides electric distribution and transmission, and natural gas distribution services in parts of eastern Washington and northern Idaho; and natural gas distribution services in parts of northeastern and southwestern Oregon, as well as generates electricity in Washington, Idaho, Oregon, and Montana.

This segment also engages in the wholesale purchase and sale of electricity and natural gas. The AEL&P segment offers electric services in the city and borough of Juneau, Alaska. The company generates electricity through hydroelectric, thermal, and wind facilities.

It also engages in venture fund investments, real estate investments, and other investments.