Constellation Energy (CEG) reported first quarter 2026 earnings with sales of US$11,122 million and net income of US$1,590 million, helped by the Calpine acquisition and data center power demand, yet the stock fell over 6% after a major analyst reduced their valuation.

The recent 1-day share price return of down 2.93% and 7-day share price return of down 12% extend a year to date share price return of down 27.04%. However, the 3-year total shareholder return of about 2.3x still reflects strong earlier gains. This suggests momentum has cooled as investors weigh Calpine driven growth alongside regulatory questions around Crane and nuclear economics.

If you are weighing how power demand and energy policy could affect other opportunities, this is a useful moment to scan 88 nuclear energy infrastructure stocks

With earnings power reinforced by Calpine, a 3 year total return of about 2.3x and the stock now down more than a quarter year to date, is Constellation Energy undervalued, or is the market already pricing in future growth?

Most Popular Narrative: 27.9% Undervalued

At a last close of $267.20 versus a narrative fair value of $370.58, Constellation Energy is framed as materially mispriced, with that gap resting on specific earnings and margin assumptions.

Growing demand for carbon-free, reliable power from large-scale customers such as data centers (Meta, Microsoft) and corporates (Comcast), driven by digitalization, electrification, and decarbonization goals, is creating new, longer-term, higher-margin contracts with price premiums, likely resulting in significant revenue and earnings growth as more transactions close.

Want to see what sits behind that premium contract story, the planned capacity additions and the step change in profitability assumptions? The full narrative lays out the growth runway in black and white.

Result: Fair Value of $370.58 (UNDERVALUED)

However, this hinges on nuclear heavy assets remaining economical and on large data center and hyperscale customers not pulling back or delaying long term power contracts.

Another View: Earnings Multiple Sends a Different Signal

While the narrative fair value and DCF style work suggest Constellation Energy looks attractive, the current P/E of 25.5x is higher than both the US Electric Utilities industry at 20.9x and the peer average at 22.3x, even though the fair ratio is 36.3x. That mix of premium pricing and implied upside raises a simple question: how much valuation risk are you really comfortable with here?

Next Steps

Sentiment appears mixed here, with clear risks on one side and meaningful potential rewards on the other. Consider reviewing the underlying data promptly and forming your own stance by weighing 4 key rewards and 3 important warning signs

Looking for more investment ideas?

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.