On a recent evening, batteries were the broad shoulders propping up California’s electricity grid. The state got 43 percent of its power from batteries as of 7 p.m. on Sunday, more than double the next power source, natural gas. It was record-setting output for batteries in the California grid, said Nicolas Fulghum, senior data analyst for Ember, an energy think tank, in a Bluesky post. Despite this strong showing in California, Texas has raced ahead to become the country’s leader in battery...