Nuclear-power stocks slumped on Monday after US regulators barred a plant from supplying extra power to an Amazon data center. The Federal Energy Regulatory Commission rejected the deal between Amazon and Talen Energy late last week.

Big tech companies need lots of electricity for their data centers, which are processing increasingly complex artificial intelligence applications.

The denial of a power agreement tied to Amazon Web Services' nuclear data center campus could slow a potential wave of similar projects across the U.S.