Tesla Powerwall display (Image: T. Larkum)

How Batteries Could Revolutionize Renewable Energy

All over California, there’s evidence of the state’s goal to lead the country in renewable energy. Enormous farms of shiny solar panels have popped up across southern California, and gigantic wind turbines dot the landscape outside nearly all the major cities. There are less flashy—and less visible—investments in renewables going on, too. Tucked away in