It’s Thursday, May 6, and California’s grid proved it can run on renewables.


Late last month, California ran on 95 percent renewable energy for one brief, shining moment. That all-time record for clean power usage in the state lasted for four seconds on Saturday, April 24.

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The record was set on the state’s main power grid, which covers four-fifths of the state but excludes Los Angeles and Sacramento. The grid was also burning some natural gas and exporting energy to neighboring states. Though 95 percent of the grid’s demand in California was met by renewable generation, there’s no way to tell what share of that figure stayed in-state and how much was exported, since power is fungible.

Despite the caveats, those four seconds were still a landmark. “It sends chills down my spine. It’s amazing,” Elliot Mainzer, president and CEO of the California Independent System Operator, which runs the state’s main power grid, told the Los Angeles Times. “We’re getting a lot of renewable generation online, making a real dent in the state’s carbon emissions.”

Renewables powered California’s energy supply for most of that day, in fact, meeting 90 percent of demand for the majority of the afternoon. Solar and wind power deserve most of the thanks, but there were contributions from geothermal and hydropower as well. 

Alexandria Herr

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