Amazon’s (NASDAQ:AMZN) plan to build a data center powered by a Pennsylvania nuclear power plant has not changed, even as the top U.S. energy regulator has turned down a request to increase power to the facility.

Chairman Willie Phillips dissented from the decision on the “first of its kind” co-location proposal, saying it could harm national security and grid reliability.

Nuclear-power stocks fell after regulators voted against a deal between Amazon and Talen Energy.The deal would permit a Talen nuclear plant to provide an Amazon data center with extra power.Nuclear stocks have surged this year as AI data centers boost energy demand.