More than a million Californians suffered power blackouts last Friday evening. When high temperatures caused customer demand to exceed the power available, California electrical utilities used rotating outages to force a reduction in demand. The California grid is the worst in the nation, with green energy policies pursued by the state likely furthering reduced grid reliability.

At 6:30 p.m. on Friday, Pacific Gas and Electric, California’s biggest utility, began shutting off power in rolling outages to force a reduction in demand. Southern California Edison also denied power to homes, beginning just before 7 p.m. Shutoffs impacted a rotating group of up to 2 million customers until 11 p.m.