UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the
Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 31, 2010

		Exact Name of Registrant as Specified in
		Charter; State of Incorporation;		IRS Employer
Commission File Number		Address and Telephone Number		Identification Number
1-8962		Pinnacle West Capital Corporation (an Arizona corporation) 400 North Fifth Street, P.O. Box 53999 Phoenix, AZ 85072-3999 (602) 250-1000		86-0512431
1-4473		Arizona Public Service Company (an Arizona corporation) 400 North Fifth Street, P.O. Box 53999 Phoenix, AZ 85072-3999 (602) 250-1000		86-0011170

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o   Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o   Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o    Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o    Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

This combined Form 8-K is separately filed by Pinnacle West Capital Corporation and Arizona Public Service Company (“APS”). Each registrant is filing on its own behalf all of the information contained in this Form 8-K that relates to such registrant and, where required, its subsidiaries. Except as stated in the preceding sentence, neither registrant is filing any information that does not relate to such registrant, and therefore makes no representation as to any such information.

 

 

Item 2.02. Results of Operations and Financial Condition

On May 6, 2010, Pinnacle West Capital Corporation (the “Company” or “Pinnacle West”) issued a press release regarding its financial results for the fiscal quarter ended March 31, 2010 and its earnings outlook for 2010 and 2011. A copy of the press release is attached hereto as Exhibit 99.1.

The information referenced in Item 7.01 below contains Company operating results for the fiscal quarter ended March 31, 2010. This information is attached hereto as Exhibits 99.2 and 99.3.

Item 7.01. Regulation FD Disclosure

The Company is providing a quarterly consolidated statistical summary and a copy of the slide presentation made in connection with the quarterly earnings conference call on May 6, 2010 (see Exhibits 99.2 and 99.3). This information is concurrently being posted to the Company’s website at www.pinnaclewest.com, which also contains a glossary of relevant terms.

Item 9.01. Financial Statements and Exhibits

(d) Exhibits.

Exhibit
No.		Registrant(s)		Description
99.1		Pinnacle West APS		Earnings News Release issued on May 6, 2010.
99.2		Pinnacle West APS		Pinnacle West Capital Corporation quarterly consolidated statistical summary for the three-month periods ended March 31, 2010 and 2009.
99.3		Pinnacle West APS		Pinnacle West Capital Corporation First Quarter 2010 slide presentation accompanying May 6, 2010 conference call.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, each registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Exhibit Index

Exhibit
No.		Registrant(s)		Description
99.1		Pinnacle West APS		Earnings News Release issued on May 6, 2010.
99.2		Pinnacle West APS		Pinnacle West Capital Corporation quarterly consolidated statistical summary for the three-month periods ended March 31, 2010 and 2009.
99.3		Pinnacle West APS		Pinnacle West Capital Corporation First Quarter 2010 slide presentation accompanying May 6, 2010 conference call.