APS. The Power to Make it Happen. Arizona Public Service Company is the largest electric utility in Arizona and the principal subsidiary of publicly-traded S&P 500 member Pinnacle West Capital Corporation (NYSE: PNW), which in turn had been formerly named AZP Group, when Arizona Public Service reorganized as that holding company in 1985. This file was recreated off a JPG (RGB) supplied by APS in January ''11.
