Pinnacle West Capital Corporation, through its principal subsidiary Arizona Public Service Company (APS), is a leading energy holding company serving the state of Arizona. The company engages in the generation, transmission and distribution of electricity to more than one million residential, commercial and industrial customers across central and southern Arizona. Pinnacle West’s diversified generation portfolio includes natural gas, coal, nuclear and renewable resources, supporting its mission to deliver safe, reliable and cost-effective power to communities throughout the region.
Founded in 1985 as the parent company of Arizona Public Service, Pinnacle West draws upon a heritage that dates back to the establishment of APS in the 1880s. Over the decades, the company has expanded its infrastructure and modernized its operations to meet the growing needs of Arizona’s economy and population. Headquartered in Phoenix, Pinnacle West is guided by a leadership team led by Chairman and Chief Executive Officer Jeffrey Guldner, whose experience in energy management and regulatory affairs helps steer the company through evolving market and policy environments.
Pinnacle West’s operational footprint encompasses an integrated grid that spans generation plants, high-voltage transmission lines and a vast distribution network. The company maintains investment-grade credit ratings and regulatory relationships that enable ongoing capital commitments to enhance grid reliability and resilience. Through its APS subsidiary, Pinnacle West also offers energy efficiency programs, demand-side management initiatives and customer-focused service innovations, all designed to optimize energy usage and support Arizona’s sustainability goals.
As part of its strategic priorities, Pinnacle West continues to pursue clean-energy development and grid modernization. The company has announced plans to retire select coal-fired units and expand solar and battery storage facilities, aligning with regional clean-energy mandates and customer expectations. By balancing legacy generation assets with emerging technologies, Pinnacle West aims to foster a low-carbon energy future while maintaining affordable and dependable service for its growing customer base.
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