What happened: The Hyatt Powerplant at Lake Oroville went offline for the first time in history due to low water levels in the state's second largest reservoir. The lake typically generates electricity by sending water through its turbines, but it can't produce power when lake levels fall below 630-640 feet. Levels hit 642 feet on Thursday, according to state data.
Context: Hyatt Powerplant has a capacity of 750 MW but usually supplies 100-400 MW depending on lake levels. It had been operating at decreasing capacity as levels dwindled, going from 30 MW last week to 10 MW this week. Officials had been predicting since June that the reservoir could lose power and said Thursday that "steps have been taken" to prepare for the loss. Grid operators have been worried about blackouts this summer and have issued a half-dozen calls for voluntary conservation as temperatures have spiked and supplies have fallen due to transmission constraints and generation going offline. Overall electricity supply Thursday was projected to be comfortably above projected demand, but hydropower levels were about a third lower than last August.
Oroville is at 24 percent of its capacity, which is about a third of average for this time of year. The state's other major reservoirs are faring slightly better, with Shasta Lake at 31 percent of capacity and Trinity Lake at 40 percent...MORE
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