SPOKANE, Wash.--(BUSINESS WIRE)--Sept. 30, 2004--Avista Corp. (NYSE:AVA) will hold its quarterly conference call and webcast to discuss third quarter 2004 results on Thurs., Oct. 21, 2004, at 10:30 a.m. EDT (7:30 a.m. PDT). A news release with third quarter 2004 earnings information will be issued at 7 a.m. EDT (4 a.m. PDT).

This call is being webcast by CCBN and can be accessed at Avista's web site at www.avistacorp.com or you may listen to the call by dialing 1.888.482.0024 in the United States, Passcode 12508636.

A replay of the call will be available until Oct. 28, 2004, by calling 888.286.8010, Passcode 21268797. The webcast will be archived for one year on the Avista Corp. website at www.avistacorp.com.

The webcast is also being distributed over CCBN's Investor Distribution Network to both institutional and individual investors. Individual investors can listen to the call through CCBN's individual investor center at www.fulldisclosure.com or by visiting any of the investor sites in CCBN's Individual Investor Network. Institutional investors can access the call via CCBN's password-protected event management site, StreetEvents (www.streetevents.com).

Avista Corp. is an energy company involved in the production, transmission and distribution of energy as well as other energy-related businesses. Avista Utilities is a company operating division that provides service to 325,000 electric and 300,000 natural gas customers in four western states. Avista's non-regulated subsidiaries include Avista Advantage and Avista Energy. Avista Corp.'s stock is traded under the ticker symbol "AVA." For more information about Avista, please visit www.avistacorp.com.

    CONTACT: Avista Corp.
             Jessie Wuerst, 509-495-8578
             jessie.wuerst@avistacorp.com

    SOURCE: Avista Corp.