CUSTOMER BACKGROUND Founded in 1884, Arizona Public Service (APS) is the largest electric utility in Arizona, providing electricity to more than 1.2 million retail and residential customers in 11 of the state’s 15 counties. With 6,400 employees and more than 4,000 megawatts of generating capacity, APS primarily serves downtown and northern Phoenix as well as Flagstaff, Prescott, Yuma, and Douglas. The utility, which also operates three nuclear reactors, plans to add 700,000 new customers by 2030. APS is regulated by the Arizona Corporation Commission, with oversight by the North American Electric Reliability Corporation (NERC) and Federal Energy Regulatory Commission (FERC). Arizona Public Service | Case StudyCHALLENGES Correcting deficiencies in the system’s operations a

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