exv99w1

Exhibit 99.1


COMMISSIONERS MIKE GLEASON — Chairman WILLIAM A. MUNDELL JEFF HATCH-MILLER KRISTIN K. MAYES GARY PIERCE		ARIZONA CORPORATION COMMISSION		BRIAN C. McNEIL Executive Director

May 6, 2008

CERTIFIED MAIL

Mr. Thomas L. Mumaw
Pinnacle West Capital Corporation
Law Department
Post Office Box 53999
Phoenix, Arizona 85072


RE:		ARIZONA PUBLIC SERVICE APPLICATION FOR A RATE INCREASE DOCKET NO. E-01345A-08-0172

Dear Mr. Mumaw:

This letter (per section R14-2-103.B.7 of the Arizona Administrative Code) is to confirm Arizona Public Service Company’s (“Company”) and Staff’s understanding that the Company will update financial schedules, testimony, and other data contained in its March 24, 2008 filing through December 31, 2007. The Company will complete the revisions by June 3, 2008.

Staff has agreed to complete its review of the updated information no later than 30 days from the date APS submits the updated information.

The time period for processing this matter, specified by AAC R-14-2-103.B.11, shall commence as of the date of the satisfactory conclusion of Staff’s review of the Company’s updated information.


	Sincerely,
	/s/ Ernest G. Johnson
	Ernest G. Johnson
	Director Utilities Division

EGJ:TLF:tdp


CC:		All the parties to the Docket Docket Control (13 Copies) Lyn Farmer, Hearing Division Janice Alward, Legal Division

1200 WEST WASHINGTON STREET; PHOENIX, ARIZONA 85007-2927 / 400 WEST CONGRESS STREET; TUCSON, ARIZONA 85701 -1347