 The announcement follows a new prediction by the state's main grid operator that electricity needs will have to provide nearly double the amount of power it currently supplies by 2030. John Scott reporting. Swaths of California are sweltering and things are only expected to get worse during the 4th of July holiday week for parts of the U.S. with nearly 90 million people under heat alerts. Forecasters say Tuesday that the torrid conditions are being caused by a ridge of high pressure just off the west coast.