Pinnacle West Capital is a holding company. Through its subsidiary, Arizona Public Service Company, a vertically-integrated electric utility, Co. provides either retail or wholesale electric service to several of the state of Arizona, with the main exceptions of about one-half of the Phoenix metropolitan area, the Tucson metropolitan area and Mohave County in northwestern Arizona. Co.'s reportable business segment is its regulated electricity segment, which consists of regulated retail and wholesale electricity businesses (primarily sales supplied under traditional cost-based rate regulation) and related activities and includes electricity generation, transmission and distribution.

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