California’s hydroelectric generation affected by historic drought
Most of the western United States is experiencing intense and historic drought conditions. California is one of the most severely affected states. As of June 22, 2021, 100% of the state is experiencing some degree of drought. About 33% of the state has been categorized under exceptional drought, the most intense drought classification. The drought conditions have affected California’s water supply levels and hydropower plants.
Drought conditions include below-normal precipitation and snowpack accumulation, very dry soil, and higher-than-normal temperatures. These factors lower the water supply available in the summer months.
Mountain snowpack serves as a natural reservoir, providing water throughout the spring and summer as it melts. However, the California snowpack was well below normal this year, and most of it melted quickly because of higher spring temperatures. Measurable snow was present at only 3 of 131 monitoring stations on June 1.
Meltwater from the snowpack often didn’t reach reservoirs in California this year because it was absorbed by drought-parched soil and streams, leaving reservoirs across the state at low levels. Shasta Lake, the largest reservoir in California, is at 48% of its average capacity. Lake Oroville, the second-largest reservoir in the state, is at 40% of its average capacity. Lake Oroville’s water level is expected to fall even lower, which will likely force the Edward Hyatt Power Plant to shut down for the first time since it opened in 1967.
Low water supply can affect hydroelectric generation. California’s previous drought, which lasted from 2012 to 2016, led to significant declines in hydroelectric generation and the state’s first-ever mandatory water restrictions in 2015. As drought conditions eased, hydropower conditions improved.
…click on the above link to read the rest of the article…
