Constellation said the long-term contract will help extend the operating life of the Clinton plant, which faced possible closure after the expiration of its zero-emissions credit. The deal also includes a planned 30-megawatt capacity expansion.

Constellation Energy stock, which has fluctuated wildly this year in the boom and bust of the AI hype cycle, briefly broke out Tuesday in response to news it signed a 20-year deal to sell power to Meta Platforms.

Facebook parent Meta announced an unprecedented deal with Constellation Energy, the largest American nuclear power plant operator, cementing Meta’s turn to turn to nuclear energy to power its energy intensive, generative artificial intelligence initiatives, and sending Constellation shares surging.