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

Amazon.com Inc. said it’s committed to building a data center campus adjacent to a Pennsylvania nuclear plant after the top US energy regulator rejected a special deal to power the facility. Most Read from BloombergFrom Housing to Immigration,

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.

Talen Energy Corp. and other US power company stocks slumped in pre-market trading Monday following the rejection by the country’s top energy regulator of Talen’s plan to supply a data center.

Talen Energy (TLN) shares pull back after US regulators rejected a deal that would have allowed Amazon's (AMZN) cloud business, Amazon Web Services (AWS), to buy power for its data centers. Catalysts Hosts Seana Smith and Madison Mills break down the news and what it means as Big Tech companies turn to nuclear energy to power their AI data centers.

Constellation Energy will continue to pursue deals to develop data centers on the sites of its U.S. power plants, days after federal regulators dealt a blow to the so-called co-located arrangements, company executives said on Monday.

The Federal Energy Regulatory Commission has rejected a request to increase the energy sent to Amazon's data centers from a Pennsylvania nuclear plant.

The commission agreed with opponents of the proposal, citing concerns about grid reliability and cost fairness.

Talen said it believed FERC had erred and was evaluating its options. The company can still restructure its expanded deal with Amazon, according to Oppenheimer analysts.

The proposal would have boosted the amount of electricity coming from the Pennsylvania power plant from 300 megawatts to 480 megawatts.