California has moved quickly to build up solar power, but has not yet figured out how to store it for when demand peaks or to avert blackouts.
The explanation illustrates one of the paradoxes confronting California as it rushes to transition to a clean-energy economy: The state has built up so much renewable energy production in recent years that it can rarely use it all during peak production hours. But it also doesn’t have enough storage capacity to hang onto it for when it might be needed.
But solar and wind generation in California is at this point far ahead of storage capacity, and in some cases isn’t sited near adequate transmission lines. Batteries and transmission lines can be costly to build and find space for, feeding skepticism from the fossil fuel industry about green energy.
The practice of rejecting renewable energy generation is called “curtailment,” and it’s risen swiftly in California in recent years — before dropping off slightly last year — as the state pushes aggressively to add more renewables to its power mix, according to calculations by the U.S. Energy Information Administration. In 2020, the California Independent System Operator curtailed some 1.
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