If your power goes out and you didn't receive a notice from us, report it online , text OUT to 284782 (AVISTA),or call us at (800) 227-9187. 29 juin 2021 · June 29 (Reuters) - Washington state energy company Avista Corp (AVA.N) told customers to prepare for more heat-related outages on Tuesday after some lost power Monday evening, as homes. Washington state energy company Avista Corp told customers to prepare for more heat-related outages on Tuesday after some lost power Monday evening, as homes and businesses cranked up.