SAN FRANCISCO—As families settled into their evening routines in late March, cooking dinner on electric stoves and flipping on their TV for the newest binge watch, the state’s energy grid was working hard.  For the first time, California discharged just over 12,000 megawatts, equivalent to 12 large nuclear plants, of energy from its battery arrays. … Continue reading California’s Battery Array Is as Powerful as 12 Nuclear Power Plants. Here’s What’s on the Horizon.