Pinnacle West Sets Date for 2011 Second-Quarter Results, Webcast and Conference Call

PHOENIX--(BUSINESS WIRE)--Pinnacle West Capital Corp. (NYSE: PNW) announced today that it plans to release its second-quarter results before the U.S. financial markets open on Tuesday, August 2, 2011.

That same day at 12:00 noon (ET), the Company also will host a live webcast of management’s conference call to discuss the Company’s 2011 second-quarter results, as well as recent developments. The webcast can be accessed at pinnaclewest.com/presentations and will be available for replay on the website for 30 days. To access the live conference call by telephone, dial [phone] or [phone] for international callers. A replay of the call also will be available until 11:59 p.m. (ET), Tuesday, August 9, 2011, by calling [phone] in the U.S. and Canada or [phone] internationally and entering account number 286, followed by conference ID number 374825.

General Information

Pinnacle West Capital, an energy holding company based in Phoenix, has consolidated assets of about $12.5 billion, more than 6,300 megawatts of generating capacity and about 6,700 employees in Arizona and New Mexico. Through its principal subsidiary, Arizona Public Service, the Company provides retail electricity service to more than 1.1 million Arizona homes and businesses. For more information about Pinnacle West, visit the Company’s website at pinnaclewest.com.