Environmental regulation. The big reason is the San Onofre plant got closed, but the real problem was that no one ever bothered to replace those lost GW. Yes, it's as simple as basis addition and subtraction that was never part of the management of the power grid. There is not enough power to supply the state if everyone is on the grid at the same time. It's no different than frying a breaker in a room because you're using too much power, all you need is a few new sockets under a different power source. They do not want to build new power plants because the green boys keep telling them prince Al Gore said not to.