EXHIBIT 23



CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM


We consent to the incorporation by reference in this Registration Statement on
Form S-8 of our reports dated March 9, 2005, relating to the consolidated
financial statements of Avista Corporation and subsidiaries (which report
expresses an unqualified opinion and includes an explanatory paragraph for
certain changes in accounting and presentation resulting from the impact of
recently adopted accounting standards), and management's report on the
effectiveness of internal control over financial reporting appearing in the
Annual Report on Form 10-K of Avista Corporation for the year ended December 31,
2004.


/s/ Deloitte & Touche LLP

DELOITTE & TOUCHE LLP

Seattle, Washington
July 13, 2005