It’s Thursday, March 4, and energy storage is shattering annual records.

During the final months of 2020, the amount of battery storage connected to the electrical grid shot up dramatically, saving more wind and solar energy and dispatching it when the wind dies or the sun goes down.

More batteries were powered up in the last three months of 2020 than in 2013 through 2019 combined, according to data collected by Wood Mackenzie, an energy research firm, and the U.S. Energy Storage Association, an industry group. That includes all types of energy storage projects, from installations in residential and commercial buildings to big utility-scale arrays.

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The explanation behind the end-of-2020 jump can be summed up in basically one word: California. The state added several record-setting battery projects to its collection throughout last year, but in December, it shattered previous records by hooking up a 1,200-megawatt-hour project in Monterey County that can discharge energy for up to four hours. Residential installations in California also jumped up. Under regular threat of having their electricity cut off due to heat waves and wildfire risks, homeowners in California are growing increasingly interested in installing their own energy storage systems.

Wood Mackenzie expects the upward trend to continue, with new storage in 2021 estimated to land at almost four times the amount added last year.

Emily Pontecorvo

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