Constellation Energy stock soared Tuesday after the nuclear power company announced that it had signed a 20-year agreement with Meta.

Citi downgrades Constellation Energy after securing a 20-year nuclear power deal with Meta. The investment bank believes there’s limited near-term upside for the stock. Citi also downgraded the outlook for Constellation Brands from Buy to Neutral.

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,