Attached files
Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by
reference in Registration Statement Nos. 333-158779 and
333-155641 on Form S-3; and in Registration Statement Nos. 33-54307, 333-143432, 333-91786, and
333-157151 on Form S-8 of our report dated February 19, 2010, relating to the consolidated
financial statements and financial statement schedules of Pinnacle West Capital Corporation and the
effectiveness of Pinnacle West Capital Corporations internal control over financial reporting
appearing in this Annual Report on Form 10-K of Pinnacle West Capital Corporation for the year
ended December 31, 2009.
/s/ Deloitte & Touche, LLP
Phoenix, Arizona
February 19, 2010
February 19, 2010