Google Turns to Existing Nuclear Plants to Power Data Centers

Google has signed a 20-year power purchase agreement with Constellation Energy to fund efficiency upgrades at six existing nuclear sites to supply its data centers.

Google announced the agreement on October 6, 2026. The term is 20 years. The electricity will come from modernized capacity at plants already operating in the PJM Interconnection footprint, the regional grid system for that area The Verge.

The plan covers 11 reactors at six sites in Illinois, Pennsylvania and New Jersey. All six sites connect to the PJM grid. The work is efficiency upgrades to existing units, meaning improved equipment and heat-to-power performance, not construction of new plants. The upgrades are expected to add 890 megawatts of additional nuclear capacity in total over the next five years.

Constellation will invest more than $4.3 billion in the upgrade program. That covers engineering, equipment replacement and extended outage work required to raise output from the 11 units while keeping them in service.

The deal includes a second contract. Google signed a separate 15-year energy supply agreement with Constellation covering other existing Constellation power plants in PJM regardless of fuel type. It sits alongside the 20-year nuclear agreement and broadens supply beyond the six nuclear sites.

Earlier on October 6, 2026, Bloomberg News reported that Alphabet, Google's parent, was nearing a multi-year deal to buy nuclear energy from Constellation for $1 billion or more Reuters. The announced 20-year agreement and the associated $4.3 billion investment figure followed that report.

Constellation said the agreement helps sustain roughly 4,400 existing jobs across the six nuclear sites Constellation. The upgrade work is expected to create about 7,200 temporary jobs across those sites Utility Dive. Google said that with this agreement, it has now enabled over 1.5 GW of new nuclear capacity Google.

The broader context here is procurement method. Hyperscale buyers, companies running very large data-center fleets, have typically used PPAs, long-term deals to buy power, tied to specific new wind, solar and storage projects. This contract applies that same purchase structure to added output at existing nuclear units. The buyer provides long-duration revenue certainty. The operator uses it to finance thermal and electrical efficiency work that raises nameplate output, the maximum rated power.

Looking at what this means for grid and load planning, duration, location and firmness are what matter. A 20-year nuclear PPA plus a 15-year multi-resource supply agreement in the same market gives Google contracted energy in PJM on two time horizons. For Constellation, it creates a funded path to get more megawatts from licensed sites without siting new reactors. For PJM, 890 MW of added firm capacity, power that stays available on demand, arrives as large-load connection requests continue to grow.

In my view, the approach is notable for its pragmatism. New nuclear construction carries schedule and cost risk. Efficiency work at operating plants does not eliminate regulatory review, but it starts from staffed sites with grid connections and operating histories. If the five-year upgrade sequence delivers the stated megawatts, it provides a repeatable template for adding firm power for compute infrastructure while preserving existing employment at those plants.