Constellation Energy Stock Drops 8%, Faces Questions Over 2026 Guidance

CEG shares fell approximately 8% on March 31 after Constellation Energy issued its 2026 adjusted operating earnings guidance at $11.00 to $12.00 per share. The midpoint of $11.50 came in below analyst consensus of roughly $11.72 to $11.92, and the miss was compounded by the absence of new data center power agreements at the company's closely watched investor update.

The selloff adds to a year-to-date decline of roughly 18% for CEG, illustrating how swiftly sentiment reverses when utility earnings fail to match growth-stock expectations. Constellation had been a marquee beneficiary of investor enthusiasm around the nuclear renaissance, with AI data center energy demand driving elevated valuations across the sector for the past 18 months. Analysts at TIKR maintain a $401 fair value estimate on the stock, suggesting the pullback may have created a longer-term opportunity for patient investors.

The episode is a broader reminder that capital-intensive nuclear operators face constraints that software companies do not: regulatory approval timelines, fuel costs, and asset divestiture impacts all weigh on near-term earnings even as the long-term power demand thesis remains intact. Constellation's guidance midpoint still represents growth over prior years, but the gap between market expectations and near-term financial reality for nuclear utilities may continue to pressure CEG until new commercial contracts — particularly additional data center power deals — materialize.