The California Independent System Operator (CAISO) is bracing for rolling outages through Wednesday, after a record-breaking heatwave in the Western U.S. strained energy supplies and necessitated power shut-offs that affected hundreds of thousands of customers over the weekend. California Gov. Gavin Newsom — who met with CAISO, as well as officials from the California Public Utilities Commission (CPUC) and California Energy Commission (CEC) this weekend about the power shortages — on Monday called for an investigation into the outages over the weekend, as well as agencies’ failure to predict them.