Four years ago, Oroville Dam, the tallest in the United States, made international news when its massive 10-mile-long reservoir filled to the top in heavy winter storms, and raging waters destroyed its spillway, causing the emergency evacuation of 188,000 people.
But now, in the latest symbol of California’s worsening drought, the opposite problem is underway: Lake Oroville’s water level has fallen so low that on Thursday, for the first time since the dam was built in 1967, its power plant was shut down because there is no longer enough water to spin the turbines and generate electricity.
“This is just one of many unprecedented impacts we are experiencing in California as a result of our climate-induced drought,” said Karla Nemeth, director of the state Department of Water Resources, which owns the dam.
On Thursday, the reservoir was only 24% full, having fallen below an all-time low record set in September 1977. The lake level has dropped a stunning 250 feet in the past two years. The water level has fallen below the intake pipes that normally send water to spin six huge turbines at the Edward Hyatt Power Plant in the bedrock under the dam.
The loss of Oroville’s electricity won’t by itself cause blackouts. Even when the lake is full, the Hyatt power plant, one of the largest hydroelectric plants in the state, provides about 1% of California’s peak statewide electricity demand.
But the problem illustrates a wider challenge facing California this year from the drought. Reservoirs are low all over.
And hydroelectricity is the state’s second-largest source of power, providing about 15% of California’s electricity each year. During the first four months this year, hydroelectric production in California fell 37% compared with the same time last year and 71% compared with 2019, according to the U.S. Department of Energy.
That power has to be made up to reduce the risk of blackouts.
“This is a huge problem. It’s part of the big challenge we are facing this summer,” said Severin Borenstein, co-director of the Energy Institute at the Haas School of Business at UC Berkeley.
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