On October 6, 2026, Google and Constellation Energy announced two long-term agreements for the PJM Interconnection grid in the eastern United States: a 20-year power purchase agreement for 890 MW of additional nuclear capacity, and a separate 15-year agreement covering 2,700 MW of energy supply. A power purchase agreement, or PPA, is a contract to buy electricity; the nuclear upgrades involve units that Constellation owns.
How the two agreements differ
| Agreement | Term | Contracted amount | Supply scope |
| Nuclear power purchase agreement | 20 years | 890 MW | Additional nuclear capacity from upgrades to existing Constellation units |
| Separate PJM energy-supply agreement | 15 years | 2,700 MW | Energy supply from Constellation’s PJM fleet, not tied to a specific generating source |
Together, the agreements cover 3,590 MW. That total combines two different arrangements: the 890 MW nuclear component and the separate 2,700 MW energy-supply agreement. Google described the latter as not tied to a specific generating source.
Upgrades to 11 existing nuclear units
The nuclear agreement funds equipment and technology upgrades at 11 existing Constellation-owned units in Illinois, Pennsylvania and New Jersey. Constellation expects power from the first upgraded plant in 2028.
The project is based on increasing output at existing nuclear units, rather than building a new reactor. The 11-unit upgrade program is the nuclear part of the deal; it does not define the scope of Constellation’s entire fleet.
Constellation’s investment and the technology alliance
Constellation said it would invest more than $4.3 billion in the project. The company also estimates that the work will sustain roughly 4,400 existing jobs and create about 7,200 construction jobs during the building period.
The announcement included a separate, expanded five-year technology alliance. Constellation selected Google Cloud and Gemini Enterprise for work focused on its energy operations and grid infrastructure, and plans to build Gemini Enterprise agentic workflows into core operations. The companies also described operational load-shaping and demand-response capabilities intended to reduce non-critical consumption during high-stress grid events.
What Google and Constellation each do
Google is the buyer under the nuclear power purchase agreement and a party to the separate energy-supply agreement. Constellation owns the units receiving upgrades, supplies energy under the separate agreement and is investing in the upgrade work. The announced arrangement covers electricity agreements and improvements to Constellation’s existing plants.
