Google Signs a 20-Year Nuclear Deal With Constellation, Without Building a New Reactor

Google and Constellation Energy have signed a 20-year agreement to add 890 megawatts of nuclear capacity to the country's largest power grid by upgrading existing reactors, with Constellation investing more than $4.3 billion. It is the clearest sign yet that the AI industry's preferred way to buy firm, carbon-free power is to squeeze more output from plants that already exist.

What the Deal Includes

According to Google's Oct. 6, 2026 announcement:

• 890 MW of entirely new capacity, tied to a 20-year power purchase agreement, from uprates at 11 Constellation-owned units at six nuclear sites in Illinois, Pennsylvania, and New Jersey. The announcement does not name the plants.
• A timeline in which the first uprate arrives by 2028; Google's blog post says all 890 MW are added by the end of 2032.
• A separate 15-year supply agreement for 2,700 MW from Constellation's existing PJM fleet. Google says this keeps those assets economically viable; it is not new capacity.
• A five-year technology alliance in which Constellation uses Google Cloud and Gemini Enterprise for an "AI for energy" blueprint covering speed to power (site selection, power flow modeling, permitting, interconnection planning), generation optimization (asset health monitoring, outage management), and protecting operational technology networks.
• Jobs: about 7,200 construction jobs and 4,400 existing jobs sustained.

"This collaboration can serve as a model for how technology companies and the energy industry can work together to responsibly develop the digital economy." — Joe Dominguez, Constellation CEO, as quoted by ESG Today

The $4.3 Billion

Google's announcement says the agreement "represents more than $4.3 billion of new investment by Constellation." That makes the figure Constellation's capital spending on equipment and technology upgrades at the 11 units, not the value of Google's purchase. The announcement does not break the figure down.

How It Compares With Amazon's Calvert Cliffs Deal

The deal is a natural companion to Constellation's Sept. 30 agreement with Amazon, and the two are structured differently. Amazon's 20-year contract covers 690 MW at Maryland's Calvert Cliffs plant. That total includes about 190 MW of new capacity from an uprate coming online between 2030 and 2032, with more than $3 billion of Maryland infrastructure investment across the 1,790 MW plant, according to Constellation's press release. The rest is existing output, and Constellation says Amazon's commitment gives it the revenue certainty to relicense the plant for another 20 years. Google's 890 MW, by contrast, is described as entirely new.

Why Uprates

Google's stated rationale is that uprating existing reactors is the fastest way to add clean capacity because it avoids the long timelines of new construction. Uprates add output at plants that already exist and are licensed; new reactor designs, which we cover in our guide to small modular reactors, still have to be built. Uprates typically require Nuclear Regulatory Commission review, and Google's announcement does not give its status, which is a main risk to the 2028 and 2032 dates.

Policy and market pressure are part of the story. Constellation framed the deal as a response to a PJM capacity shortfall of about 6.8 GW driven by data center demand, according to Yahoo Finance. Google's announcement ties it to PJM's "Bring Your Own Power" proposal, the federal UPRISE program for increasing output from existing nuclear plants, and the White House Ratepayer Protection Pledge. Constellation shares rose roughly 12% to 14% on the news.

Where It Fits

Google says it has now enabled 1.5 GW of nuclear capacity in the U.S., which it puts at about 25% of the Department of Energy's goal of 5 GW of domestic expansion by 2030. Its other nuclear arrangements include uprates at four Georgia Power reactor units, the restart of Iowa's dormant Duane Arnold plant (more than 600 MW) with NextEra, and advanced reactors with Kairos and TVA at Oak Ridge, Tennessee. For the broader picture, see our report on nuclear and the AI boom and our analysis of why data centers are reshaping the power grid.

Why It Matters

• Existing reactors are the near-term play. Uprates add capacity years faster than new builds, which is why buyers are lining up for them.
• The money is Constellation's. More than $4.3 billion of new investment by the plant owner, backed by a 20-year buyer.
• Not all megawatts are new. Google's 890 MW is new; the 2,700 MW supply and most of Amazon's 690 MW come from existing output.
• Dates depend on regulators. The 2028 first-uprate and 2032 completion targets are goals, not guarantees.