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Constellation Energy's Calvert Cliffs nuclear power plant
Photo: Utility Dive

Constellation Energy Stock Jumps 12% After Google Nuclear Deal

Google Cloud Press Corner2 min read6 sources

Why did Constellation Energy stock jump 12%?

Constellation Energy (CEG) stock rose 12% to $300.40 on Tuesday after Google signed a 20-year deal to fund 890 MW of nuclear upgrades, giving the power producer a long-term customer.

Key numbers

Constellation close (Oct 6)$300.40+12.25% (touched +15% intraday)
New nuclear capacity890 MW20-year deal, from 2028
Constellation investment$4.3B+11 reactor units
Total Google contracts3,590 MW890 MW plus 2,700 MW
Constellation market cap~$95BStill down about 15% YTD
Oklo close (Oct 6)$38.81+8% day; down 46% YTD

What happened

Constellation Energy (CEG) stock rose 12% to $300.40 on Tuesday after Google signed a 20-year deal to fund 890 MW of nuclear upgrades, giving the power producer a long-term customer. Google will pay for upgrades at 11 existing Constellation reactors in Illinois, Pennsylvania and New Jersey, adding about one large reactor's worth of power from 2028. Constellation plans to invest more than $4.3 billion, and Google signed a separate 15-year deal for another 2,700 MW. Oklo rose 8% and Vistra about 11%, though neither is part of the deal.

Why it matters

Constellation Energy shows how the huge electricity needs of AI data centers are turning into long-term contracts for power plants. Google is paying for more output from reactors that already exist, which is faster than building new ones. The regional grid (PJM), which serves about 67 million people, is short roughly 6.8 gigawatts of power, so tech companies are competing for supply.

Who this affects

Marketbullish
Medium impact
Power and nuclear stocks rallied, helping their shareholders.
Companybullish
High impact
Constellation gains a 20-year customer; good for shareholders.
Competitorsbullish
Medium impact
Vistra, Talen and Oklo rose in sympathy, helping holders.
Industrybullish
Medium impact
Tech firms locking in nuclear power is good for producers.

Constellation Energy vs Vistra, Oklo, NuScale Power

Constellation EnergyCEG$300.40+12.25%-15%
VistraVST$160.50+10.77%—
OkloOKLO$38.81+8%-46%
NuScale PowerSMR$8.20+7%-42%

As of 2026-10-06

How we got here

  1. Google and Constellation announce a 20-year, 890 MW nuclear power purchase agreement.

  2. Amazon also signs a 20-year deal for 190 MW at Calvert Cliffs, a $3B expansion.

  3. First reactor uprate expected to start adding power to the PJM grid.

  4. All 890 MW of new capacity expected to be online.

What to watch

  • Whether more tech companies sign power deals as PJM faces a roughly 6.8 GW shortfall.Q4 2026
  • Whether Constellation updates its outlook for the $4.3B upgrade plan in its next earnings report.Q4 2026
  • Progress on the first reactor uprate adding power to the grid.2028

Educational content only. Not investment advice.

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