Solar photovoltaic panels in the desert near Phoenix may seem unremarkable. After all, the southwestern United States offers some of the best solar conditions in North America.
But a recently announced 65 megawatt (MW) project is making news by coupling solar PV with battery energy storage, a first for utility Arizona Public Service, which solicited proposals in 2017 for generation sources to provide electricity during peak demand hours.
Perhaps more noteworthy is the fact that the solar-plus-storage bid beat out other generation sources, including multiple proposals for natural gas plants. (The utility has an agreement with an existing natural gas-fired plant for a total of 570 MW for the summers of 2020 through 2026.)