A fleet of electric-powered school buses in El Cajon, California, can send electricity back to the state’s grid, thanks to first-of-its kind technology developed by a local company and a partnership with San Diego Gas & Electric. And soon other school districts in the area will be able to do the same. “These buses are like storage on wheels,” said Gregory Poilasne, CEO of Nuvve, a tech company based in Liberty Station that specializes in advancing what’s called “vehicle to grid” projects. Nicknamed V2G for short, the bi-directional technology allows electric vehicle batteries that charge durin…