NRC Grants Diablo Canyon a 20-Year License Extension, Marking the Agency's 100th Renewal as California's Nuclear Future Hinges on State Lawmakers
Federal regulators approved a 20-year license extension for California's last nuclear plant, but state law limits operations to 2030 without legislative action.
Overview
The U.S. Nuclear Regulatory Commission on April 2 approved a 20-year license renewal for Pacific Gas and Electric’s Diablo Canyon Power Plant, California’s last operating nuclear facility. The decision extends the federal operating authorization for Unit 1 through November 2, 2044, and Unit 2 through August 26, 2045, according to PG&E’s announcement. The renewal marks the NRC’s 100th operating license extension for U.S. power plants.
However, a critical constraint remains: California’s Senate Bill 846, signed in 2022, currently authorizes Diablo Canyon to operate only through 2030. Extending the plant’s life beyond that date will require a separate vote by the state legislature.
What We Know
Diablo Canyon generates more than 2,200 megawatts and supplies approximately four million Californians with electricity. The plant accounts for nearly 20 percent of California’s clean energy portfolio and roughly 9 percent of the state’s total electricity supply, according to PG&E.
The three-year license renewal process involved approvals from four state and regional agencies in addition to the NRC: the California Public Utilities Commission, the State Lands Commission, the California Coastal Commission, and the Central Coast Regional Water Quality Control Board. PG&E CEO Sumeet Singh called the facility “the state’s largest source of clean energy and a cornerstone of reliability,” according to the company’s press release.
The plant employs nearly 1,300 workers, making it one of San Luis Obispo County’s largest private employers. PG&E estimates that continued operations avoid greenhouse gas emissions equivalent to removing 1.6 million cars from the road annually, generating approximately $450 million in financial benefits from avoided emissions each year.
The federal government has also invested heavily in keeping Diablo Canyon operational. The Department of Energy’s Civil Nuclear Credit Program, funded through the Bipartisan Infrastructure Law, finalized $1.1 billion in credit payments to PG&E to support extended operations. The credits were distributed over a four-year period from 2023 through 2026.
What We Don’t Know
The central uncertainty is whether the California Legislature will vote to extend operations beyond 2030. The NRC’s 20-year federal license is effectively provisional until Sacramento acts. No legislation has yet been introduced to authorize the additional 14 to 15 years of operation that the federal renewal would permit.
California faces rapidly growing electricity demand driven by data centers, AI infrastructure, and building electrification, adding urgency to the legislative decision. Whether lawmakers view nuclear power as part of meeting that demand, or continue to prioritize the state’s decades-old moratorium on new nuclear construction, remains an open question.
Background
Diablo Canyon’s trajectory from scheduled retirement to federal license renewal is one of the most dramatic reversals in American energy policy. PG&E agreed with environmental and labor groups in 2016 to retire Unit 1 in November 2024 and Unit 2 in August 2025. But after rolling blackouts during a 2020 heat wave exposed grid fragility, Governor Gavin Newsom signed SB 846 in 2022 to keep the plant running through at least 2030.
The NRC’s 100th license renewal comes at a moment when nuclear energy is experiencing a broader resurgence in the United States. Rising electricity demand from data centers, AI infrastructure, and electrification has prompted utilities and policymakers to reconsider the role of existing nuclear plants. The Diablo Canyon renewal underscores a broader shift in how policymakers weigh the tradeoffs between nuclear power’s carbon-free output and the long-standing safety and environmental concerns that led California to ban new reactor construction more than five decades ago.