Fitch Upgrades Avista Corp. to Investment Grade

SPOKANE, Wash., May 19 /PRNewswire-FirstCall/ -- Fitch Ratings announced today
that it has upgraded the corporate credit rating of Avista Corp. (NYSE: AVA)
to BBB- from BB+, which raises the company's rating to investment grade. In
addition, Avista Corp's senior unsecured debt ratings were upgraded to BBB
from BBB-. Fitch cited Avista's more balanced regulatory environment, improved
financial profile and continued focus on the core utility business as major
factors in the upgrade. This announcement follows the credit rating upgrades
received from Standard & Poor's in February 2008 and from Moody's Investors
Service (Moody's) in December 2007.

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"To have an investment grade rating with the three major ratings services is a
significant milestone for the company. This is the goal we have been working
toward over the past seven years," said Scott Morris, Avista chairman,
president and CEO. "Fitch returning our credit rating to investment grade is a
solid indication of our company's progress toward financial recovery. While
this is an important achievement, we still have work to do in strengthening
our financial standing, especially as we continue our significant investment
in our utility's infrastructure, including hydro generation plant
enhancements, and our transmission and distribution systems."

The changes positively affect Avista's ability to secure debt at lower rates.
A reduction in interest costs over time, together with increased financial
flexibility, may result in lower operating expenses.

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 our operating division that provides service to 355,000 electric
and 315,000 natural gas customers in three Western states. Avista's primary,
non-regulated subsidiary is Advantage IQ. Our stock is traded under the
ticker symbol "AVA." For more information about Avista, please visit
www.avistacorp.com.

Avista Corp. and the Avista Corp. logo are trademarks of Avista Corporation.

This news release contains forward-looking statements regarding the company's
current expectations. Forward-looking statements are all statements other than
historical facts. Such statements speak only as of the date of the news
release and are subject to a variety of risks and uncertainties, many of which
are beyond the company's control, which could cause actual results to differ
materially from expectations. These risks and uncertainties include, in
addition to those discussed herein, all of the factors discussed in the
company's Annual Report on Form 10-K for the year ended Dec. 31, 2008, and the
Quarterly Report on Form 10-Q for the quarter ended March 31, 2009.

Security ratings are not recommendations to buy, sell or hold securities. The
ratings are subject to change or withdrawal at any time by the respective
credit rating agencies. Each credit rating should be evaluated independently
of any other ratings.

SOURCE Avista Corp.

Investors, Jason Lang, +1-509-495-2390, Jason.lang@avistacorp.com, or Media,
Jessie Wuerst, +1-509-495-8578, jessie.wuerst@avistacorp.com, both of Avista
Corp., or Avista 24/7 Media Line, +1-509-495-4174