eight plants, 15 operating reactors

Customer-backed uprates already planned?

more than $7 billion for approximately 1,080 megawatts

DOE Offers Constellation Up to $5 Billion for Nearly 1.1 GW of Nuclear Uprates at Eight Plants, None Yet Final

FERC & Federal News Policy & Markets
Marin Holt
October 30, 2026
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8 minutes read

Conditional loan commitment: up to $5 billion
Capacity the uprates would add: nearly 1.1 GW
Plants covered: eight plants, 15 operating reactors
Customer-backed uprates already planned: more than $7 billion for approximately 1,080 megawatts

The U.S. Department of Energy Office of Energy Dominance Financing offered Constellation Energy a conditional loan commitment of up to $5 billion on October 27, 2026. The money would finance nuclear uprates and modernization at eight plants in Illinois, Maryland and Pennsylvania. POWER Magazine reported the work would add nearly 1.1 GW of generating capacity. Energy Secretary Chris Wright announced the commitment during a visit to the Byron plant in Illinois.

The eight plants hold 15 operating reactors. Constellation owns interests worth about 15.5 GW of net capacity at them, POWER reported, citing the 2025 Constellation annual report. Three sites run pressurized water reactors: Braidwood (2,386 MW) and Byron (2,350 MW) in Illinois, and Calvert Cliffs (1,789 MW) in Maryland. Five run boiling water reactors. Those are Clinton (1,092 MW), Dresden (1,845 MW), LaSalle (2,320 MW) and Quad Cities (1,403 MW) in Illinois, plus Limerick (2,315 MW) in Pennsylvania. Constellation owns 75% of Quad Cities.

The commitment is not a loan yet. DOE said Constellation must satisfy technical, legal, environmental and financial conditions first. Only then will the department sign financing documents and fund the loan. Constellation said the commitment does not by itself represent a final decision to proceed with any individual uprate. It also does not commit the company to every facility under consideration. DOE included an option to finance additional uprate projects at other Constellation plants.

Customer contracts already back most of the uprate work. Constellation said its 20-year agreements with Google and Amazon have incentivized the company to invest more than $7 billion to add approximately 1,080 megawatts of nuclear capacity. The Google agreement supports about $4.3 billion of work to add 890 MW at 11 units across six sites in PJM. Those projects are due to start delivering capacity in 2028 and to finish by the end of 2032.

The Amazon agreement supports an approximately 190 MW expansion at Calvert Cliffs, scheduled for 2030 to 2032. Meta backs a 30 MW expansion at Clinton. A 176 MW Walmart agreement at Dresden includes 30 MW of planned uprates.

The DOE list does not include Salem in New Jersey. PSEG operates Salem, and Constellation holds a 42.59% interest. POWER noted that Salem was one of the six sites named for the Google agreement. Constellation has not said how the 890 MW splits among the reactors.

DOE launched the Utility Power Reactor Incremental Scaling Effort, or UPRISE, in March 2026. The goal is 5 GW of nuclear capacity from uprates and restarts. POWER reported the program has identified approximately 4.7 GW of potential nuclear capacity additions toward the 5-GW target. Power Engineering reported that 95% of the 5-GW uprate and restart goal has been identified.

The plants sit in PJM and MISO, where DOE has issued emergency orders this year. On October 12, DOE authorized PJM to dispatch additional generation amid elevated maintenance outages and tightening reserve margins. The agency has also ordered fossil plants in both regions to stay available, including the Constellation Eddystone units in Pennsylvania.

Why It Matters

The $5 billion is a conditional commitment on top of the Google and Amazon agreements that already cover approximately 1,080 megawatts of nuclear capacity. A federal loan lowers the borrowing cost for Constellation. It does not add a reactor or a megawatt that those deals did not already plan. The open question is how much of the nearly 1.1 GW of generating capacity is new. POWER wrote that the scope of the federal financing remains unclear, given its overlap with the customer-backed commitments.

For PJM load, the first uprate megawatts arrive in 2028 at the earliest. Data center demand in the region is growing now. For other nuclear owners, the offer shows what DOE will finance under UPRISE. It backs measured uprates at plants with signed offtake, not speculative restarts. The next tell is whether Constellation names a per-plant megawatt list before the loan closes.

Critical Perspective

The $5 billion commitment is conditional, and Constellation says it is not a final decision for any single uprate. The Google and Amazon agreements already cover approximately 1,080 MW of the nearly 1.1 GW, so the federal loan mostly refinances work the company had planned to do. Vogtle Units 3 and 4 in Georgia carried about $12 billion of DOE loan guarantees and still finished roughly seven years late, which shows that federal credit does not shorten the licensing clock. If cheaper debt funds uprates that power purchase agreements already pay for, who keeps the savings, PJM ratepayers or Constellation shareholders?