Google’s nuclear deal with Constellation: what it means for bills

Google has agreed to buy the extra output from upgrades at 11 existing nuclear reactors run by Constellation Energy, a 20-year deal that sent Constellation’s shares up about 12%. Here is what the agreement covers and why it matters for anyone who pays an electricity bill in the eastern United States.

Key takeaways

Constellation will spend more than $4.3 billion to squeeze 890 megawatts (MW) of new capacity out of 11 reactors in Illinois, Pennsylvania and New Jersey, with Google buying that power for 20 years.
A separate 15-year agreement covers about 2,700 MW from Constellation’s existing supply in the PJM grid, taking the total package to roughly 3.6 gigawatts.
The deal lands in a region where data-centre demand has pushed grid capacity prices to record highs, so who pays for new power is a live question for households.

Why everyone is talking about it

The announcement on October 6 was one of the biggest market movers of the week. Constellation, the largest nuclear operator in the US, closed up roughly 12% at about $300 a share, and other power producers with nuclear plants also rallied. Investors read it as fresh proof that tech companies are willing to sign long, expensive contracts to secure round-the-clock, low-carbon electricity for artificial intelligence data centres.

It also touches a sensitive nerve. Electricity bills have been rising in many US states, and utilities and regulators are under pressure to show that the AI building boom is not being paid for by ordinary customers.

The facts so far

What is being built: “uprates” at 11 reactor units across six sites, including Braidwood, Byron, LaSalle and Quad Cities in Illinois, Limerick in Pennsylvania and Salem in New Jersey. Constellation says the work covers turbines, steam generators and digital control systems.
How much: 890 MW of new capacity, backed by more than $4.3 billion of Constellation investment. Limerick alone is set to add about 348 MW and Salem about 97 MW, according to the Philadelphia Inquirer.
When: the first uprate is expected by 2028, with work at the Pennsylvania and New Jersey plants running to about 2032.
What is not disclosed: the price Google will pay per megawatt-hour, or the total value of its payments.
Extras: a 15-year supply deal for about 2,700 MW in PJM and a five-year technology partnership under which Constellation will use Google Cloud and Gemini AI tools.

Both companies say the deal follows the White House “Ratepayer Protection Pledge”, meaning the new capacity should be added without passing the cost to residential customers. Google’s energy lead, Amanda Peterson Corio, said the uprates would strengthen the PJM grid “while protecting energy affordability.”

The background

An uprate is a bit like fitting a bigger engine and better gearbox into a car you already own, rather than buying a new one. The reactor stays, but modern equipment lets it turn the same heat into more electricity. That matters because building a brand-new reactor in the US typically takes well over a decade from permitting to power, while uprates can be done in a few years at existing, already-licensed sites.

The location matters too. PJM Interconnection runs the grid for about 67 million people across 13 states and Washington, D.C. Its last capacity auction, for the 2027/28 year, cleared at a record $333.44 per megawatt per day — the maximum allowed under a temporary price cap — and still fell about 6.6 gigawatts short of PJM’s reliability target. PJM said nearly all of the 5,250 MW rise in its peak-demand forecast came from data centres.

Google is not alone. Microsoft signed a deal in 2024 to restart a reactor at the former Three Mile Island site, also with Constellation, and Google has also agreed to buy power from a planned restart of NextEra Energy’s Duane Arnold plant in Iowa.

What it means for your money

For electricity customers: nothing changes on your bill tomorrow. In the longer run, extra supply in a tight market is generally helpful, because scarcity is what pushed capacity prices to the cap. A simple way to see the scale: at $333.44 per MW per day, one megawatt of capacity costs about $121,700 a year ($333.44 × 365). Those costs flow through to retail bills, although capacity is only one slice of a typical bill alongside energy, transmission and delivery charges.

For a rough sense of size, 890 MW running about 90% of the time (typical for US nuclear plants) would produce around 7 billion kilowatt-hours a year. That is in the region of what 650,000 average US homes use, based on typical consumption of about 10,500 kWh per home per year. This is our own illustrative estimate, not a company figure.

Whether households actually benefit depends on how state regulators and PJM treat these big private deals. If you live in a state facing rate increases, it is worth following your utility’s filings — see our coverage of OG&E’s proposed $395 million rate hike for how such requests work, and our energy-saving tips for cuts you control today.

For investors: the share-price jumps show how much the market values long-term contracts with big tech buyers. But the undisclosed pricing, multi-year construction timelines and regulatory risks mean the payoff is far from guaranteed. This is general information, not financial advice.

What to watch next

Regulatory filings for the uprates with the Nuclear Regulatory Commission and a named first unit for 2028.
PJM’s next capacity auction and any rule changes on how large data-centre loads pay for grid capacity.
Further nuclear or long-term power deals from other tech firms, and how state regulators respond. Key dates are on our economic calendar.

Sources

Written by The Daily Economy editorial team with AI assistance and checked against the sources above. Read our editorial policy.

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