DOE offers Constellation conditional loan of up to $5B for nuclear uprates

The US Department of Energy's Office of Energy Dominance Financing announced on October 27, 2026 a conditional loan commitment of up to $5 billion to finance nuclear uprates and modernization across Constellation Energy's fleet in Illinois, Maryland and Pennsylvania. DOE says the work will add nearly 1.1 GW of electricity in the PJM and MISO regions, enough by its count to power more than 930,000 homes. The plants named are Braidwood, Byron, Clinton, Dresden, LaSalle and Quad Cities in Illinois, Calvert Cliffs in Maryland and Limerick in Pennsylvania, and the commitment carries an option to finance future uprates at additional Constellation facilities.

No money has moved, and no uprate is locked in. Constellation says the commitment "does not, by itself, represent a final Constellation decision to proceed with any individual uprate or at every facility under consideration." Per DOE, Constellation "must satisfy certain technical, legal, environmental, and financial conditions before the Department enters into definitive financing documents and funds the loan." The agency is the more definite of the two: it calls the eight plants the sites of Constellation's planned investments, while Constellation's own release says only that the commitment would be available to support potential uprates there.

Neither release splits the megawatts by plant. Asked which plants could move sooner and by how much, Constellation told Engineering News-Record that the information in its release was "all we have to share at this time."

DOE ties the loan to President Trump's executive order calling for the department to facilitate 5 GW of power uprates from existing reactors, and to the Utility Power Reactor Incremental Scaling Effort (UPRISE) it launched in March 2026. "To date, 95% of President Trump's 5-GW uprate and restart goal has been identified," the release says. The order's target is uprates; the tally DOE reports counts restarts too.

Private contracts, public credit

Constellation frames the loan as building on private contracts. Its release says recent 20-year agreements with Google and Amazon "have incentivized Constellation to invest more than $7 billion to add approximately 1,080 megawatts of nuclear capacity," and that an agreement with Meta supports a 30 MW expansion at Clinton. DOE's nearly 1.1 GW sits close to that 1,080 MW, though neither release says the loan finances the contracted uprates.

The plant lists overlap without matching. Google's 890 MW spans 11 units at six sites in Illinois, Pennsylvania and New Jersey. A Constellation spokesman told the American Nuclear Society's Nuclear News that those plants include Braidwood, Byron, LaSalle, Quad Cities, Limerick and PSEG Nuclear's Salem in New Jersey; Nuclear News puts Constellation's stake in Salem at 43%. DOE's list has no New Jersey plant. It adds Clinton, the Meta site; Calvert Cliffs, where Amazon's contract includes an approximately 190 MW uprate; and Dresden, which none of those three deals names.

The money is credit, not a grant, and Constellation says it "could lower financing costs and help Constellation deliver additional nuclear capacity at greater scale." Three weeks apart, chief executive Joe Dominguez's two pitches differ by one ingredient. On October 6, announcing the Google deal, he said it could serve as a model for investing in energy infrastructure "in a way that delivers grid-wide benefits for all, funded by private entities." On October 27 he called the approach "pairing private-sector demand and investment with smart federal financing to unlock more power from the nuclear plants we already have," and said the conditional commitment "can help us move faster and go further." The first pitch stressed funding by private entities; the second adds federal financing to private demand.

Constellation has borrowed from DOE before. The Loan Programs Office closed a $1 billion loan to Constellation on November 18, 2025 for the restart of the 835 MW Crane Clean Energy Center in Pennsylvania. The uprate version of the deal is also familiar: on October 5, DOE offered Vistra a conditional loan of up to $4.2 billion for 433 MW of uprates that Meta had already agreed to buy.

From closure notices to license filings

Two plants on the list were once headed for retirement. On August 27, 2020, Exelon Generation, which then owned them, announced that Byron would close in September 2021 and Dresden in November 2021, citing revenue shortfalls it put in the hundreds of millions of dollars.

Both kept running after Illinois enacted Senate Bill 2408 on September 15, 2021, which, per the Energy Information Administration, supports nuclear plants through a carbon credit plan. Six years after the closure notice, Byron and Dresden are on a federal list of plants to make bigger.

The Nuclear Regulatory Commission's table of expected uprate applications does not name the plants either. Last updated September 8, 2026, it lists 12 planned submittals from Constellation Energy Generation between the fourth quarter of 2026 and the fourth quarter of 2030: five extended power uprates and seven measurement uncertainty recaptures. Every one lists its plant as "Proprietary," and the table says nothing about the loan. The earliest is an extended power uprate planned for the fourth quarter of 2026.

Outlook

The first marker is the financial close. DOE's release gives no date for it, as it gave none for Vistra's October 5 commitment. The second is the NRC: if Constellation files the extended power uprate the agency's table expects in the fourth quarter of 2026, that docket would name the plant and the power increase sought. The option for additional facilities leaves room for Salem, the one plant the spokesman named for the Google deal that DOE's list leaves out, though neither release mentions it.