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Press release from Business Wire

APS Prepared to Serve Customers This Summer

<p class=' bwtextaligncenter'> <i>Company Provides Annual Update to ACC</i> </p>

Thursday, April 08, 2010

APS Prepared to Serve Customers This Summer17:16 EDT Thursday, April 08, 2010 PHOENIX (Business Wire) -- APS customers can expect to have an ample supply of electricity available to keep comfortable through the summer's hottest months, company officials told the Arizona Corporation Commission (ACC) today at its summer assessment briefing. This message was part of APS' annual report to the ACC of its plans for meeting the energy needs of its customers when demand is at its peak. The presentation included this summer's peak demand forecast, an inventory of the available resources to serve that demand, a summary of APS' implemented and planned system improvements, and the company's preparedness to respond to wildfires and other emergencies. “We are well positioned to meet the energy needs of our customers when demand is at its highest,” said Daniel Froetscher, APS Vice President of Energy Delivery. “Arizona's extreme summer temperatures require us to continually evaluate and upgrade our system. We must also keep in mind the historical growth of the population we serve. And, of course, we must remain prepared for unplanned events that could impact our system.” This summer, APS has forecasted a peak of 7,059 megawatts (MW), compared with the 2009 summer peak of 7,218 MW, which occurred on July 27, during the hottest month ever recorded in Phoenix. Between its existing generation, and long-term and short-term contracts, APS has 8,752 MW of resources available to help meet summer demand. (The summer peak – the 15-minute period when APS customers require the most energy – typically occurs in July or August between 5 and 6 p.m.) In addition to building and maintaining infrastructure, planning to meet the needs of a service territory comprised of more than 34,000 square miles means being prepared for any contingency. Wildfires, summer storms and unforeseen circumstances require coordination among federal, state, county and local authorities, in addition to other electric utilities. The APS system is designed to withstand unexpected loss of certain facilities without impacting customers. The state's other major electric utilities also made presentations to the ACC. APS, Arizona's largest and longest-serving electricity utility, serves about 1.1 million customers in 11 of the state's 15 counties. With headquarters in Phoenix, APS is the principal subsidiary of Pinnacle West Capital Corp. (NYSE: PNW)