24/09/2026
California's solar boom has pushed the state's electricity system into territory that was almost unimaginable a decade ago. In May 2026, solar supplied more than half of California's electricity for the month, demonstrating how quickly large-scale solar farms and rooftop systems have transformed the state's power mix.
California now has tens of gigawatts of installed solar capacity, and during sunny afternoons solar generation can exceed total demand, sometimes forcing the grid to export electricity or use batteries to shift the surplus into the evening.
The milestone is particularly significant because California's electricity demand is enormous, while its grid must simultaneously balance solar, wind, natural gas, hydroelectricity, batteries and imports. The challenge now is not simply producing solar power—but storing and delivering it after the sun goes down.
Source: California Energy Commission / CAISO, 2026