Rolling Blackouts in California Have Power Experts Stumped

Energy experts are bewildered as to why the manager of California’s electric grid called on utilities to cut power to hundreds of thousands of customers over the weekend. “They said that the utilities had plenty of power available and that the blackouts weren’t necessary,” writes Ivan Penn via The New York Times. From the report: “They set it up like this is a historic event,” said Bill Powers, a San Diego engineer who provides expert testimony on utility matters before the state’s regulators. “This should not have triggered blackouts.” The California Independent System Operator, the nonprofit entity that controls the flow of electricity for 80 percent of California, said it acted after three power plants shut down and wind power production dropped. It also cited a lack of access to electricity from out-of-state sources. The energy experts noted that the peak electricity use over the weekend fell below peaks in other years, when utilities were able to handle the demand. They also said the operating reserves of power available to the utilities were higher than the 3 percent level where California ISO has traditionally ordered a reduction in electricity use. “It’s just misleading to say that it was because it was a hot day,” said [David Marcus, an energy consultant and former adviser at the California Energy Commission]. “I think they were being overly cautious.” Saturday’s peak demand, according to Mr. Marcus, reached 44,947 megawatts, much lower than the 46,797 he saw on Friday. But both of those amounts fell below the peak year for electricity use, 2006, when demand reached 50,270 megawatts, followed by 2017 with 50,116, according to data from California ISO. […] What happens in the days ahead will continue to test Californians and the electric grid as California ISO forecast electricity demand Monday at near all-time peak levels.