Google's 3.6 GW Constellation deal is mostly an existing-plant contract. The construction work is the reactor uprates
Google signed 3,590 MW of power agreements with Constellation, but only about 890 MW is tied to new output from upgraded reactors. For subs, the real work is the uprate scope at 11 nuclear units, and it is narrower than the headline.
Google's October 6 deal with Constellation Energy headlines at 3,590 megawatts, but only about 890 MW of it is new output from upgraded reactors. For a trade sub, the construction work sits in those upgrades, not in the full number.
What did Google actually sign?
Reuters-sourced and syndicated reports describe two pieces:
| Piece | Size | What it is |
|---|---|---|
| Upgraded-plant agreement | 890 MW | 20-year deal tied to upgrades at existing nuclear plants; first delivery expected around 2028 |
| PJM supply agreement | 2,700 MW | Long-term supply in the PJM market, not tied to a specific plant or fuel source |
Constellation says the arrangement drives more than $4.3 billion of investment at reactors in Illinois, Pennsylvania and New Jersey, covering 11 units according to one report. Coverage differs on framing: some outlets call the package a 3.6 GW nuclear deal, while an analysis from Let's Data Science argues only the 890 MW is new capacity.
Why does that split matter to a subcontractor?
A supply contract moves electrons on paper. It does not put crews on site. The uprate work is what gets built, and it is a narrow, specialized market.
- Scope is inside operating plants. Uprates generally mean mechanical, electrical and controls work on existing equipment, scheduled around outages. That is different from a greenfield data center job.
- Qualification is the gate. Nuclear owners set safety, quality-assurance and site-access requirements. A sub without that history is unlikely to bid it cold.
- Timing is slow. First upgraded power is expected around 2028, so this is multi-year pipeline, not next quarter's backlog.
What does this mean for data center backlog?
The deal shows hyperscalers are now buying power years ahead and tying it to physical plant work. It follows our earlier look at how data center spending is concentrating sub backlogs. The power piece of a data center project is increasingly arranged by the owner before a GC is hired, which affects what is, and is not, in a campus scope.
Not every claim here is settled. The figures are company-reported, most coverage traces back to one Reuters report, and the deal's structure is a response to PJM's "Bring Your Own Power" proposal, so terms may shift.
What should a sub do this week?
- Ask the GC or owner where power sits. On any data center bid, confirm who supplies and schedules utility and on-site generation scope.
- Check your qualifications. If you do plant-side mechanical or electrical work, see whether your safety record and QA documentation would meet a nuclear owner's prequalification.
- Do not count the 3.6 GW as work. Plan around the 890 MW of upgrade scope and the 2028 start, not the headline.
- How much power did Google contract from Constellation?
- Google signed agreements totaling 3,590 megawatts with Constellation Energy, announced October 6, 2026. That splits into a 20-year, 890 MW deal tied to upgraded nuclear plants and a separate 2,700 MW long-term supply agreement in the PJM market.
- Will the Google-Constellation deal create construction work?
- Yes, but mainly in the 890 MW portion. Constellation says the deal drives more than $4.3 billion of new investment to upgrade existing reactors, with the first upgraded power expected around 2028.
- Is the whole 3.6 GW new nuclear capacity?
- No. Analysts note that only about 890 MW is new capacity from upgrades. The 2,700 MW is a supply contract that does not add generation to the PJM grid.
- Which trades are affected by nuclear plant uprates?
- Uprates typically involve mechanical, electrical, instrumentation and controls work inside operating plants, usually scheduled around refueling outages. Firms need the qualifications and site access that nuclear owners require.