California water regulators approve state permits for Diablo Canyon

By Noah Baustin | 02/27/2026 01:08 PM EST

The Nuclear Regulatory Commission will now decide whether to extend California’s last operating nuclear power plant.

The Diablo Canyon Nuclear Power Plant is shown.

The Central Coast power plant has needed to obtain numerous permission to continue its operations. Michael A. Mariant/AP

California officials on Thursday adopted the final two state permits that California’s last operating nuclear power plant needed to continue operating through 2030.

What happened: The Central Coast Regional Water Quality Control Board approved a certification that Diablo Canyon’s waste discharges comply with the Clean Water Act and a permit regulating how the plant discharges water from its cooling system back into the Pacific Ocean.

Pacific Gas & Electric, which operates the plant, celebrated the decision.

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“These approvals allow us to continue operating our once-through cooling system as we have throughout our history, remaining respectful and responsible stewards of the surrounding environment,” PG&E Chief Nuclear Officer Paula Gerfen said in a statement.

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