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Constellation Energy Stock Jumps 12.2% After Google Nuclear Deal

Google Cloud Press Corner2 min read6 sources

Why did Constellation Energy stock jump 12%?

Constellation Energy (CEG) stock rose 12.2% to $300.40 on Tuesday after Google signed a 20-year deal for 890 MW of upgraded nuclear power, a contract backed by more than $4.3B of reactor upgrades.

Key numbers

One-day share gain (Oct 6)+12.2%Closed at $300.40; no source found shows the ~6% gain cited in the brief topic
New nuclear capacity890 MW20-year agreement, 11 existing units
Constellation investment$4.3B+Reactor upgrades in IL, PA, NJ
Separate existing-plant supply deal2,700 MW15-year term
Shares year to date-15%Still down despite the jump

What happened

Constellation Energy (CEG) stock rose 12.2% to $300.40 on Tuesday after Google signed a 20-year deal for 890 MW of upgraded nuclear power, a contract backed by more than $4.3B of reactor upgrades. Google also signed a separate 15-year deal to buy 2,700 MW (megawatts, a measure of power output) from Constellation's existing plants. The upgrades make 11 existing reactors in Illinois, Pennsylvania and New Jersey produce more power, with the first due in 2028. The price Google will pay was not disclosed. The stock is still down about 15% for 2026.

Why it matters

Constellation Energy now has a large, long-term customer for extra nuclear power. Tech companies need huge amounts of steady electricity for AI data centers, and Google chose to pay for upgrades at existing reactors, which can add power sooner than building new plants. Other nuclear-power companies, including Vistra and Talen, also rose that day. Because Google's price was not disclosed, the profit from the deal is still unclear.

Who this affects

Marketbullish
Medium impact
Nuclear-power stocks rose; good for holders of Vistra, Talen.
Companybullish
High impact
Constellation gets a 20-year Google customer; good for shareholders.
Competitorsbullish
Medium impact
Vistra, Talen rose in sympathy despite not being involved.
Industrybullish
Medium impact
Tech firms may fund more reactor upgrades; good for nuclear owners.

Constellation Energy vs Vistra, Talen Energy

Constellation EnergyCEG$300.40+12.2%-15%21.9x
VistraVST$155.95+8%——
Talen EnergyTLN$355.87+7%——

As of 2026-10-06

How we got here

  1. Amazon signs a nuclear power deal with Constellation.

  2. Google and Constellation announce 20-year, 890 MW nuclear deal plus 15-year, 2,700 MW supply deal.

  3. Constellation shares close up 12.2% at $300.40.

  4. First reactor upgrade expected to come online.

What to watch

  • Whether Constellation discloses Google's price or the returns on the $4.3B upgrade spending.Q3 2026 earnings
  • Whether Vistra, Talen or others announce similar power deals with tech companies.Q4 2026
  • Progress on the first reactor upgrade, due online in 2028.2028

Educational content only. Not investment advice.

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