The U.S. electricity grid was designed to generate electricity and deliver it almost immediately to customers—very little is stored. Adding more energy storage could have benefits, like helping utilities: Meet demand during supply disruptions; Recover faster after outages; Support renewable energy by storing power when natural sources—like wind and sunlight—are abundant and releasing it when they are not. But it can be hard to put storage technologies on a grid that wasn't designed for this use. Also, putting storage on the grid means navigating varied state rules and regulations. We offer policy options to address these and other challenges.