The U.S. Nuclear Regulatory Commission approved Pacific Gas and Electric’s 20‑year renewal of the Diablo Canyon Power Plant on April 2 2026, extending the operating licenses for Unit 1 to November 2 2044 and Unit 2 to August 26 2045. The renewal follows a three‑year review that secured approvals from the California Public Utilities Commission, the State Lands Commission, the California Coastal Commission, and the Central Coast Regional Water Quality Control Board.
While the federal renewal extends the plant’s license through 2044‑45, California law—Senate Bill 846—caps Diablo Canyon’s operation to 2030. Any operation beyond that date requires additional legislative action, meaning the NRC approval does not automatically allow the plant to run past 2030. The state law takes precedence over the federal license, creating a regulatory split that PG E must navigate to keep the plant online beyond the 2030 threshold.
The renewal also incorporates environmental mitigation measures that were conditions of the agency approvals. PG E agreed to conserve thousands of acres of land and to meet updated water‑discharge monitoring requirements set by the Coastal Commission and the Water Quality Control Board. These measures were part of the conditions that allowed the plant to receive the necessary permits and approvals from the various state agencies.
Financially, the extension is expected to cost ratepayers about $0.03 per kilowatt‑hour generated in 2026, rising to $0.08 per kilowatt‑hour when new fees authorized by recent legislation are included. The plant’s continued operation supports PG E’s net‑zero greenhouse‑gas goal for 2040 and supplies roughly 10‑20 % of California’s total electricity and 16‑23 % of its zero‑carbon electricity, providing a reliable, carbon‑free base load that helps stabilize the grid as the state expands intermittent renewables.
Strategically, the license renewal strengthens PG E’s low‑carbon portfolio and underpins its broader climate strategy. Diablo Canyon’s 53 % share of the company’s zero‑carbon output and its role as a stabilizing force during periods of high demand make the plant a critical asset in California’s transition to a clean‑energy future. Future legislative action will determine whether the plant can continue beyond 2030, but the NRC approval marks a significant regulatory milestone for PG E’s long‑term energy mix.
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