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Within three years, a surge of large-scale battery projects is expected to come online on Texas and California power grids.

Within three years, a surge of large-scale battery projects is expected to come online on Texas and California power grids as developers seek to store electricity produced by those state’s sprawling wind and solar farms.

The Energy Department has estimated that 21 gigawatts of storage capacity will plug into U.S. power grids before 2026, more than 2½ times the amount now in operation. Almost 8 gigawatts are expected in Texas.

The boom in battery development comes as weather-dependent wind and solar energy becomes an increasingly large part of the U.S. power grid, requiring an alternate power source when the wind isn’t blowing and the sun isn’t shining.