Constellation Energy (CEG) Stock: Can This Nuclear Giant Keep Flying After 40% Surge?

TLDR

• Constellation Energy stock jumped over 40% in the past year, outpacing the S&P 500’s 13% return
• The company is the largest U.S. nuclear operator and differs from typical utilities by selling power competitively rather than through regulated distribution
• Constellation received final DOJ clearance for its $26.6 billion Calpine acquisition, expected to close in early 2026
• Q3 2025 earnings came in at $3.04 per share adjusted, up from $2.74 a year earlier, with analysts projecting over 20% growth in 2026
• The stock trades at roughly double the utilities sector average P/E ratio, with analyst price targets ranging from $360 to above $400

Constellation Energy secured the last major regulatory approval for its Calpine acquisition. The company received final clearance from the U.S. Department of Justice to complete the roughly $26.6 billion transaction.

Constellation Energy Corporation, CEG

The deal could close in early 2026. It will make Constellation even larger than its current position as the country’s biggest low-carbon energy producer.

The stock saw some selling pressure last week following the approval news. Investors focused on the concessions and asset divestitures required to get the deal done. Some market watchers had to adjust their expectations for post-deal returns and synergies.

Despite the short-term volatility, the stock has crushed the broader market over the past year. Shares climbed more than 40% while the S&P 500 gained nearly 13%.

Constellation operates differently than most power companies. Instead of running regulated utilities with monopoly service territories, it generates electricity and sells it competitively. The company signs long-term power purchase agreements with utilities, commercial customers, and industrial users.

It holds a 21% market share in selling power to commercial and industrial customers. That makes it the market leader in that segment.

The Calpine Expansion

The Calpine purchase will transform Constellation’s portfolio. Calpine is the largest U.S. power producer from natural gas and geothermal sources.

The combined company will have operations across the country. It will gain expanded presence in key growth markets like Texas, Virginia, and California.

Natural gas power is seeing renewed demand from tech companies. These firms need reliable power for their AI data centers. Constellation will have a broader energy mix to meet these needs.

The company currently generates about 90% of its electricity from carbon-free sources. Its fleet includes nuclear, hydro, wind, solar, natural gas, and oil. This portfolio produces enough power for over 20 million homes and businesses.

Financial Performance and Growth

Third quarter 2025 results showed solid growth. The company reported adjusted operating earnings of about $952 million, or $3.04 per share. That compared to $2.74 per share a year earlier.

Analysts expect strong earnings growth ahead. Projections call for high single-digit growth in 2025 and over 20% growth in 2026.

The company plans to spend $3 billion on capital projects in 2025. That figure rises to $3.5 billion in 2026. Most of the spending will go toward nuclear fuel and clean energy growth.

Constellation continues winning new business from major clients. It landed federal clean energy contracts and long-term power deals with large tech companies. These customers want carbon-free electricity to meet their sustainability goals.

The company signed high-profile agreements with Microsoft and Meta Platforms. These deals helped drive the stock’s recent rally.

Constellation is restarting its Crane Clean Energy Center. The roughly 835-megawatt facility received backing from a $1 billion Department of Energy loan. The company also proposed new generation and storage projects in Maryland totaling up to 5,800 megawatts.

The firm launched emission-free energy certificates and nuclear-based zero-emission certificates with Xpansiv. This creates another way to monetize its carbon-free power output.

Analyst coverage remains mostly positive. One survey shows 19 analysts with a “Moderate Buy” rating and an average 12-month price target around $360. Some firms including Scotiabank, Jefferies, and Melius set targets above $400.

The main concern centers on valuation. Constellation trades at roughly double the P/E multiple of the broader utilities sector. The company does have a stronger balance sheet and return on equity than peers, with debt-to-capital in the low 30% range and ROE above 20%.

The stock closed at $359.82 on December 5, 2025, down $8.80 or 2.39% for the day.

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