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): August 30, 2005

Commission File Number	Exact Name of Registrant as Specified in Charter; State of Incorporation; Address and Telephone Number	IRS Employer 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 (17CFR 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. Each registrant is filing on its own behalf all of the information contained in this Form 8-K that relates to such registrant. Neither registrant is filing any information that does not relate to such registrant, and therefore makes no representation as to any such information.

Item 7.01 Regulation FD Disclosure

Investor and Analyst Meeting

     Pinnacle West Capital Corporation (“Pinnacle West” or the “Company”) is making a presentation to investors and analysts in Boston, Massachusetts and New York, New York on August 30 — September 1, 2005. Copies of the slides to be presented are attached hereto as Exhibit 99.1

Item 9.01. Financial Statements and Exhibits    
           (c) Exhibits.

Exhibit
No.	Registrant(s)	Description
99.1	Pinnacle West Arizona Public Service Company	Pinnacle West slide presentation to investors and analysts in Boston, Massachusetts and New York, New York on August 30 — September 1, 2005.

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.

	PINNACLE WEST CAPITAL CORPORATION (Registrant)
Dated: August 30, 2005	By:	/s/ Nancy C. Loftin
		Nancy C. Loftin
		Vice President, General Counsel and Secretary

	ARIZONA PUBLIC SERVICE COMPANY (Registrant)
Dated: August 30, 2005	By:	/s/ Nancy C. Loftin
		Nancy C. Loftin
		Vice President, General Counsel and Secretary