U.S. Energy Department Commits Up to $5 Billion for Constellation Nuclear Upgrades

The U.S. Energy Department’s Office of Energy Dominance Financing on Oct. 27 announced a conditional loan commitment of up to $5 billion to support nuclear reactor upgrades and modernization across Constellation Energy’s fleet in Illinois, Maryland, and Pennsylvania. The projects are expected to add nearly 1.1 gigawatts of generating capacity, strengthening grid reliability and expanding electricity supplies across the PJM Interconnection and Midcontinent Independent System Operator regions.

The planned investments will increase output at eight nuclear generating stations: Braidwood, Byron, Clinton, Dresden, LaSalle, and Quad Cities in Illinois; Calvert Cliffs in Maryland; and Limerick in Pennsylvania. The upgrades are expected to generate enough electricity to power more than 930,000 homes and support over 10,000 project-related jobs across the company’s nuclear fleet. The financing also includes an option to fund future upgrades at additional facilities. The commitment remains conditional, and Constellation must meet technical, legal, environmental, and financial requirements before financing agreements can be finalized and funds disbursed.

The initiative supports President Donald Trump’s executive order on reinvigorating the nuclear industrial base, which calls for 5 gigawatts of additional generating capacity through upgrades to existing nuclear reactors. In March 2026, DOE launched the Utility Power Reactor Incremental Scaling Effort to increase electricity generation from operating reactors. The administration has identified projects covering 95 percent of its 5-gigawatt nuclear uprate and restart target.

The funding announcement follows a series of federal financing initiatives to expand nuclear generation. In October 2026, DOE announced a conditional loan commitment of up to $4.2 billion to Vistra to modernize its nuclear plants in Pennsylvania and Ohio. In September 2026, the agency finalized a loan of up to $1.9 billion to NextEra Energy to support the planned restart of the 615-megawatt Duane Arnold Energy Center in Iowa. The administration has also committed $17.5 billion through its American Nuclear Supply Chain Loans initiative to accelerate equipment procurement for projects targeting the deployment of 10 large reactors.