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.

Constellation Energy shares are surging in early trading Tuesday after the company said it had struck a 20-year deal to sell nuclear power to Meta Platforms, in the latest tech firm-to-nuclear collaboration aimed at powering data centers.