In early March, strong winds brought down trees and power lines in the Nashville area, leaving thousands of homes without power. But about 20 miles outside the city an electric pickup truck fed energy to John and Rachelle Reigard’s home, keeping their lights on.“You can look at all the houses around us, and they’re all off,” said Mr. Reigard, who bought the pickup, a Ford F-150 Lightning, more than a year ago. “A lot of people ask the question: ‘How do you have power?’”The Reigards are part of a small group of pioneers using the batteries in their electric vehicles as a source of backup power for their homes. Energy and auto experts expect many more people to do the same in the coming years as auto and energy compan …
