Constellation Energy stock slips today as Calpine deal steps and nuclear AI demand stay in focus
NEW YORK, December 30, 2025, 23:22 ET — Market closed Constellation Energy Corporation shares slipped 0.4% to $357.12 on Tuesday, ending the session lower as the market headed into the final trading days of the year. The move matters because Constellation has become a key proxy for bets that electricity demand from artificial intelligence data centers will keep tightening U.S. power markets, lifting the value of steady, around-the-clock generation such as nuclear. Nuclear sentiment was in focus again after Duke Energy said it applied to the U.S. Nuclear Regulatory Commission for an early site permit for a potential new nuclear