More than 2 million homes are already equipped with solar power, and at least 70,000 of those homes have batteries to store excess power that can be used during an outage, according to Maze-Rothstein. That number is expected to almost double by the end of 2021 as home battery storage paired with solar panels becomes more common.

“One of the things we see as an important psychological shift is, if you always thought of the grid as reliable and you have one- or two-hour blackout, you’ll be OK,” he said.

The value of the residential and commercial renewable energy grid markets is expected to soar over the next decade. Eaton, an American power management company headquartered in Ireland, told investors last week that it estimates microgrids will be a $40 billion market by 2030, up from $9 billion this year. Sunrun, which owns about 9 percent of the market share in U.S. residential solar, saw a 350 percent increase in traffic to its site from Texas alone after February’s cold snap left millions of state residents without power for days.