Google to buy 890 extra MW from upgraded U.S. nuclear plants in $4.3B Constellation deal

Constellation will add 890 megawatts of capacity at 11 existing U.S. nuclear plants in Illinois, Pennsylvania, and New Jersey by upgrading the turbines, steam generators, and digital control systems inside reactors that are already running. The work is paid for by a 20-year power purchase agreement with Google and more than $4.3 billion of new Constellation investment, and the resulting output is roughly equivalent to three or more small modular reactors, with no new reactor being built.

Nuclear uprates do not get the headlines that greenfield plants do. Instead of pouring concrete for a new reactor, an operator takes a working one and asks the same fuel to do more. The mechanism swaps in higher-capacity turbines, replaces steam generators, and tightens the digital control loop, all of which lets the reactor push more megawatts onto the grid. The trade-off is that the work happens during scheduled refueling outages, so it avoids the multi-year construction timeline and the interconnection-queue waits that have stalled most new U.S. generation projects in PJM and beyond.

Constellation says the 890 MW of incremental capacity delivered through this collaboration "equals the output of three or more small modular reactors (SMRs) or a large new conventional reactor." The deal sustains roughly 4,400 existing jobs and is expected to create about 7,200 construction jobs during the building period, according to the company. The first uprate delivery date and lead plant have not been publicly detailed.

The Google-Constellation deal sits next to a 15-year energy supply agreement covering an additional 2,700 megawatts across Constellation's PJM fleet. That 2,700 MW arrangement is structured to keep existing nuclear assets economically viable without removing them from the grid. A reactor that does not pencil out financially gets shut down, and the megawatt disappears with it; the 15-year deal is meant to keep the math on the right side of that line.

A second agreement gives the two companies a strategic framework to evaluate new clean generation, storage, and demand response across the U.S., with near-term PJM prioritization. In a separate transaction, Oracle agreed to buy power from Wisconsin's Point Beach nuclear plant. The Point Beach terms, including length and volume, have not been publicly detailed in the materials reviewed for this article.

The companies also signed a 5-year technology alliance under which Constellation will use Google Cloud and Gemini Enterprise to reduce the cost of building new infrastructure, improve plant performance, and harden grid operations. The alliance is a supporting subplot rather than the story's center of gravity; the megawatt math is what finances the uprate work.

The initiative is described as directly advancing the U.S. government's UPRISE programme, a public-private effort to maximize electricity output from existing nuclear infrastructure. UPRISE has not been independently detailed by a U.S. government channel in the materials reviewed for this article, so the framing should be read as company-attributed until a primary federal source is published.

The first uprate delivery will show whether the 890 MW lands on a multi-year clock or slips into the same interconnection and permitting queue that has stalled greenfield nuclear elsewhere. Constellation says the upgrades fit inside scheduled refueling outages. The first plant to break ground on the upgrade schedule will set the timeline for the rest.