When a winter storm took out the grid across Texas in 2021, Matt Popovits and his family didn’t have power for four days, and didn’t have heat in the record cold. “We spent the night huddled up lying on the floor in our living room next to our gas fireplace, just desperately trying to stay warm,” he says. “And I remember looking at my wife and saying, ‘We can never let this happen again.’”

They started researching whole-house generators, but the cost, at around $15,000, was prohibitive. Last year, another storm took out the family’s power again for several days. They relied on a small generator, but it didn’t work well. Now they’ve turned to a new solution: a battery backup system that they didn’t have to buy.

The system was installed by Base Power, a Texas-based startup that’s trying to

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