Nuclear power provided about 10% of California's total electricity supply in 2021

In 2021, three nuclear power plants supplied about 10% of California's electricity. Diablo Canyon, located in San Luis Obispo County, is California's last operating nuclear power plant, and it supplied over 8% of California's electricity in 2021. The remaining nuclear electricity supply was imported from the Palo Verde Generating Station in Arizona and the Columbia Generating Station in Washington.