Pinnacle West Corporate Responsibility Report Ranked #1
Report Highlights Company's Sustainability Efforts

June 11, 2009

Pinnacle West Capital Corp’s (NYSE: PNW) 2008 Corporate Responsibility Report received the highest overall score among utilities in the United States by The Roberts Environmental Center at Claremont McKenna College (CMC).

The Center, which analyzes social responsibility reporting efforts of domestic and international corporations, gave Pinnacle West’s 2008 report an A+. The next highest ranked utility received a B+.

“The research, based entirely on material released on the firms’ Web sites, found that two of the smallest firms – Mirant (energy sector) and Pinnacle West Capital (utilities sector) – did the best jobs of describing details of their socially beneficial actions and environmental management,” the Center said in a press release reporting its findings.

The focus of the 2008 Pinnacle West (PNW) Corporate Responsibility Report is the Company’s efforts to build a more sustainable company and future for Arizona’s environment, economy and communities.

The Report, which covers Pinnacle West and its subsidiaries Arizona Public Service (APS), APS Energy Services and SunCor Development, is available online at www.pinnaclewest.com/cr. This report provides:

• an overview of how PNW integrates sustainability principles into its business plans;
• details of APS’ recently filed Resource Plan, which maps out the company’s preferred path to meet Arizona’s energy needs by 2025;
• information on renewable energy and demand-side management programs;
• an explanation of PNW’s efforts to bolster the Arizona economy and its communities;
• a discussion of how innovative technologies will be used to meet future needs, and meet environmental challenges, including renewable energy and smart meters; anddetails on PNW’s environmental footprint, including greenhouse gas emissions, along with the company’s environmental policy and position on climate change.

“Sustainability is not a flavor of the month, or a green initiative that comes and goes depending on other priorities,” said Ed Fox, APS Vice President and Chief Sustainability Officer. “Rather, it is our business model. We undertake initiatives that are sustainable as part of our core business strategy for short- and long-term success of the company, our customers and shareholders.”

PNW’s reports are prepared in accordance with guidelines set by CERES, a coalition of public-interest and investor organizations. To the extent possible, the report also follows the Global Reporting Initiatives (GRI) guidelines. These guidelines were established to develop globally applicable standards for sustainability reporting.

Pinnacle West is a Phoenix-based company with consolidated assets of about $11.4 billion. Through its subsidiaries, the Company generates, sells and delivers electricity and sells energy-related products and services to retail and wholesale customers in the western United States. It also develops residential, commercial, and industrial real estate projects.

Alan Bunnell, APS Media
(602) 250-3376

Steve Gotfried, APS Media
(602) 250-3040

Rebecca Hickman, APS Analyst
(602) 250-5668

Lisa Malagon, APS Analyst
(602) 250-5671