DOE Offers $5 Billion Loan to Constellation for Nuclear Uprates
The U.S. Department of Energy has conditionally committed up to $5 billion to Constellation Energy to finance uprates at eight nuclear plants, aiming to add 1.1 GW of capacity to support grid reliability and meet rising power demand.
The U.S. Department of Energy has offered Constellation Energy a conditional loan commitment of up to $5 billion. The financing aims to accelerate nuclear uprates and modernization at eight plants across Illinois, Maryland, and Pennsylvania. Announced on October 27, 2026, the loan supports a program to add approximately 1.1 gigawatts of supply capacity. That addition matches the electricity use of more than 930,000 households and is equivalent to one large new reactor.
The commitment is not a completed loan. Constellation must satisfy technical, legal, environmental, and financial conditions before any funds are disbursed. The proposed federal financing could lower borrowing costs and accelerate projects, according to the company. The uprate strategy predates recent technology-company agreements but is supported by them. Twenty-year agreements with Google and Amazon have incentivized more than $7 billion in Constellation investment to add about 1,080 MW of nuclear capacity.
Nuclear capacity expansion targets and program scope
This loan advances the DOE's Utility Power Reactor Incremental Scaling Effort, or UPRISE. Launched in March, the program aims to add 5 GW of capacity from existing nuclear fleets by 2029. It has an interim target of 2.5 GW by 2027. The agency has identified approximately 4.7 GW of potential additions toward its goal. The portfolio includes uprates and restarts of previously retired plants across several companies.
| Project Group | Capacity Addition | Type |
|---|---|---|
| Constellation Energy | nearly 1.1 GW | Uprates |
| Vistra | 433 MW | Uprates |
| Southern Co. | more than 300 MW | Uprates |
| Palisades Nuclear Plant | 800 MW | Restart |
| Crane Clean Energy Center | 835 MW | Restart |
| Duane Arnold Energy Center | 615 MW | Restart |
Agency involvement could enable over 1 GW of additional capacity by 2027 and another 1 GW by 2029 compared to an industry-only scenario, according to a former deputy assistant secretary for nuclear energy.
Project timeline and implementation details
Constellation's uprate projects are scheduled to deliver new capacity between 2028 and 2032. Google-backed projects are expected to begin coming online in 2028 and be completed by the end of 2032. The Amazon-backed uprate at the Calvert Cliffs plant in Maryland is scheduled for the 2030 to 2032 period. A separate agreement with Meta supports a 30-MW expansion at the Clinton plant in Illinois.
The company is expected to submit 12 power uprate applications between the fourth quarter of 2026 and the end of 2030. These include five extended power uprates and seven measurement uncertainty recapture uprates. Project schedules extend beyond UPRISE's original milestones, with some industry uprates anticipated as late as 2034.
Economic and grid impact
The project is expected to support more than 10,000 related jobs across supply chain and construction activity. The loan covers plants connected to the PJM Interconnection and MISO regional grids. The DOE suggested additional generation in these regions would strengthen grid reliability as AI-driven power demand grows.
The financing would support uprates at eight nuclear plants comprising 15 operating reactors. This represents approximately 15.5 GW of net generating capacity attributable to Constellation’s ownership interests. The proposed investments are geared to expand nuclear output across PJM and MISO. On October 12, the DOE authorized PJM to dispatch additional generation amid raised maintenance outages and tightening reserve margins.
The conditional commitment includes an option to finance additional uprate projects at other Constellation facilities. It does not constitute a final investment decision for any individual uprate. Each project remains subject to due diligence and definitive financing agreements. The $5 billion loan includes an option to cover future uprate projects at other Constellation facilities beyond the initial eight sites.
Combined, the Constellation and Vistra conditional loan commitments total up to $9.2 billion and could support approximately 1.5 GW of additional nuclear capacity. The DOE has also advanced a broader $26.5 billion loan package with Southern Co., supporting various projects including nuclear upgrades. Constellation must satisfy all technical, legal, environmental, and financial conditions before funding is disbursed.
