Constellation Energy Stock vs Vistra Stock: Which AI Power Play Has More Upside?

Key Takeaways

• TIKR’s model targets a 15% IRR for Constellation Energy stock versus 1% for Vistra stock, reflecting how much upside each price already embeds.
• Constellation’s Calpine acquisition lifts FY2026 revenue to roughly $38.8 billion and adds approximately $2 per share of earnings accretion.
• Vistra posted record first quarter EBITDA of $1.5 billion, but the stock’s 746% five-year return leaves minimal forward room in the model.
• Wall Street implies 40% upside for Constellation Energy stock and 47% for Vistra stock, but TIKR’s model favors CEG even at its low case.

Key Stats: Constellation Energy (CEG)

• Current Price: $262.35
• 52-Week Range: $241 to $413
• Market Cap: $91 billion
• Enterprise Value: $113 billion
• Analyst Mean Target: $368 (40.4% implied upside)
• Analyst Consensus: 13 Buys, 6 Outperforms, 2 Holds, 1 Sell (19 analysts)

Key Stats: Vistra (VST)

• Current Price: $154
• 52-Week Range: $133 to $220
• Market Cap: $50 billion
• Enterprise Value: $72 billion
• Analyst Mean Target: $225 (46.8% implied upside)
• Analyst Consensus: 14 Buys, 4 Outperforms, 1 Underperform, 1 Sell (17 price targets)

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Nuclear Scale vs. Integrated Power: Two Approaches to the AI Data Center Boom

Constellation Energy operates the largest fleet of nuclear power plants in the United States, producing clean, firm, around-the-clock electricity that data centers increasingly want to buy directly through long-term contracts. The company closed its acquisition of Calpine in early 2026, adding roughly 21,000 megawatts of natural gas and geothermal capacity to its existing nuclear base and nearly doubling quarterly revenue to $11.1 billion.

Management projects base earnings growth exceeding 20% through 2029, supported by the nuclear production tax credit that grows with inflation, long-term data center offtakes, and a commercial platform that now serves over 80% of the Fortune 100.

Constellation has submitted approximately 5,000 megawatts of new capacity into PJM’s interconnection queue, including nuclear uprates, new gas generation, and battery storage, positioning the company to capture incremental demand as regulatory clarity emerges.

Vistra combines a smaller but strategically positioned nuclear fleet (Comanche Peak in Texas and Beaver Valley in PJM) with one of the largest natural gas generation portfolios and a retail electricity franchise serving millions of customers across 40 states.

The integrated model proved its value in the first quarter, when record mild weather in ERCOT pressured retail margins but the generation segment offset the impact, delivering $1.43 billion of segment EBITDA on its own. Vistra signed long-term power purchase agreements with Meta for approximately 2,600 megawatts at its PJM nuclear sites and is acquiring the 5,500-megawatt Cogentrix gas portfolio, expanding the fleet while maintaining mid-teens levered return discipline.

CEO Jim Burke described ERCOT load growth of 5% to 6% annually through 2030 as a reasonable base case and noted that ERCOT forward curves do not yet reflect even that conservative estimate.

The distinction between these two companies is not about quality. Both operate world-class generation fleets, both are signing data center contracts, and both generate billions in free cash flow. The difference that matters for investors is starting valuation.

Constellation Energy stock trades at roughly 22x FY2026 estimated earnings after pulling back 36% from its 52-week high, leaving significant distance between the current price and what the TIKR model suggests the business is worth.

Vistra stock trades at roughly 14x forward earnings on a lower absolute multiple, but the stock’s five-year run from approximately $18 to $154 has compressed forward return potential to levels where the TIKR model sees the AI power premium as largely absorbed.

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Constellation Energy’s Estimate Revisions Are Accelerating; Vistra’s Are Already Priced In

The business case for each company translates directly into a divergent earnings trajectory, and the quarterly estimate sequence makes that divergence concrete. Constellation’s Calpine integration created a step change that the forward estimates are still absorbing at elevated growth rates, while Vistra’s growth is more incremental, layered onto an already large base with meaningful upside sitting outside the official guidance range.

Constellation Energy posted Q1 2026 revenue of $11.12 billion, up 64% year over year, with EBITDA of $2.78 billion at a 25% margin and normalized EPS of $2.74, up 28% from the prior year quarter.

Consensus estimates carry that momentum forward: Q2 2026 revenue of $8.71 billion at 43% growth, Q3 2026 revenue of $10.43 billion at 59% growth, with EBITDA margins holding in the 22% to 24% range across both quarters.

The growth is directly traceable to Calpine’s approximately $2 per share accretion, higher PJM capacity prices, and inflation-linked nuclear PTC escalation. In the Q1 earnings call, CFO Shane Smith also said the company expects $8.4 billion in free cash flow across 2026 and 2027, rising to $11.5 billion to $13 billion in 2028 and 2029

On the other hand, Vistra posted Q1 2026 revenue of $5.64 billion, up 43% year over year, with EBITDA of $1.48 billion at a 26% margin and normalized EPS of $1.35, up 315% from the prior year quarter.

Consensus estimates show continued strength: Q2 2026 revenue of $5.77 billion at 36% growth with EBITDA margin expanding to 30%, and Q3 2026 revenue of $7.10 billion at 43% growth with EBITDA of $2.06 billion.

Critically, those estimates exclude any contribution from the pending Cogentrix acquisition or the Meta nuclear PPAs, leaving a layer of upside that has not yet entered the base numbers. Management expects more than $10 billion of total cash generation over 2026 and 2027, allocating roughly $3 billion to shareholders and $4 billion to growth investments.

Wall Street’s coverage of Constellation Energy stock includes 19 analysts with a mean price target of $368, implying 40% upside from the current $262 close. The high target sits at $441, and the consensus skews heavily bullish with 19 of 21 ratings at Buy or Outperform.

Meanwhile, Vistra stock draws a mean target of $225 from 17 price targets, implying 47% upside from $154. Vistra’s analyst base is similarly constructive, with 18 of 20 ratings at Buy or Outperform and a high target of $320.

The Street sees slightly more near-term upside in Vistra, but the conviction gap narrows when adjusting for the wider spread between Vistra’s high and low targets ($320 versus $99) compared to Constellation’s ($441 versus $310).

The gap between Constellation Energy stock and Vistra stock is visible in the data right now. Catch every analyst upgrade, estimate revision, and earnings surprise on both the moment it happens with TIKR for free →

Vistra Has the Better Margins Per Dollar; Constellation Energy Has the Better Dollars

The profitability comparison between these two power producers starts with operating margins, and the quarterly trajectory tells a sharper story than any annual average.

In Q3 2025, before Calpine closed, Constellation posted a 16% operating margin on $6.57 billion of revenue, producing $1.07 billion of operating income.

Accordingly, Vistra posted a 21% operating margin on $4.97 billion of revenue that same quarter, producing $1.05 billion of operating income.

The two companies generated nearly identical operating income on different margin profiles.

The first quarter of 2026 showed the post-acquisition divergence.

Constellation’s quarterly revenue reached $11.12 billion with a 22% operating margin, producing $2.44 billion of operating income in a single quarter.

Vistra posted $5.64 billion of revenue at a 27% operating margin, generating $1.50 billion in operating income. Vistra’s margin percentage was higher, but Constellation’s absolute operating income exceeded Vistra’s by roughly $940 million, a scale gap that compounds across every subsequent quarter as Calpine’s earnings fully integrate.

The margin story here is not about one company being more profitable than the other. It is about which profitability profile creates more room for earnings growth.

Vistra’s higher percentage margins on a smaller base have already been recognized by the market in the stock’s five-year run. Constellation’s lower-percentage but rapidly scaling margins on a much larger base represent the incremental earnings power that the TIKR model sees as underpriced.

TIKR’s Model Targets 90% Upside in Constellation Energy and 4.5% in Vistra

TIKR’s model values Constellation Energy stock at approximately $499 by the end of 2030, implying around 90% total return from the current price of $262, or roughly 15% per year.

The target rests on the operating income trajectory the first quarter already showed: $2.44 billion in a single quarter at a 22% operating margin, a scale of profitability that did not exist before Calpine closed.

If that margin profile holds across the enlarged revenue base while inflation-linked nuclear PTC and contracted data center offtakes continue layering, the earnings power underlying the target becomes a continuation of what the income statement already demonstrates, not a speculative leap.

Constellation Energy stock appears undervalued at current levels, with roughly 90% total upside and a 15% annualized return implied by TIKR’s model.

Meanwhile, TIKR’s model values Vistra stock at approximately $160 by the end of 2030, implying around 5% total return from the current price of $154, or roughly 1% per year.

The narrow gap between price and target reflects a stock that has already priced in the profitability profile the income statement shows: a 27% operating margin in the first quarter on $5.64 billion of revenue, strong by any standard but already recognized in a five-year run from $18 to $154.

For the model to see meaningful additional upside, Vistra would need the Cogentrix acquisition and Meta PPAs, both currently excluded from guidance, to deliver margin and earnings accretion beyond what the current income statement trajectory supports.

Vistra stock appears roughly fairly valued at current levels, with just 5% total upside and a 1% annualized return implied by TIKR’s model.

The model gap is the clearest signal in this comparison: TIKR sees roughly 15% annualized return potential in Constellation Energy stock and roughly 1% in Vistra stock, a spread that reflects not a quality difference but how much of each company’s earnings story the current price has already absorbed.

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Should You Invest in Constellation Energy Stock or Vistra Stock?

The only way to really know is to look at the numbers yourself. TIKR gives you free access to the same institutional-quality financial data that professional analysts use to answer exactly that question.

Pull up Constellation Energy stock and Vistra stock and you’ll see years of historical financials, what Wall Street analysts expect for revenue and earnings in the quarters ahead, how valuation multiples have moved over time, and whether price targets are trending up or down for both companies.

You can build a free watchlist to track Constellation Energy and Vistra alongside every other stock on your radar. No credit card required. Just the data you need to decide for yourself.

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