DOE Commits $10.1 Billion to Constellation and Alliant for Nuclear Uprates and New Capacity

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The U.S. Department of Energy has pledged a combined $10.1 billion in loans and loan guarantees to Constellation Energy and Alliant Energy, backing roughly 3.7 gigawatts (GW) of new and upgraded power generation across five states. The commitments, disclosed on October 27 and 28, 2026, mark the tenth financial close under the department’s Energy Dominance Financing (EDF) program and its largest single push yet to keep aging nuclear reactors running longer and at higher output.

A conditional $5 billion for eight reactors

The larger of the two deals is a conditional loan commitment of up to $5 billion for Constellation Energy, announced by DOE’s Office of Energy Dominance Financing on October 27. The money is earmarked for uprates — engineering upgrades that let an existing reactor produce more power without building a new plant — and modernization work across eight units: Braidwood, Byron, Clinton, Dresden, LaSalle and Quad Cities in Illinois, Calvert Cliffs in Maryland, and Limerick in Pennsylvania.

DOE estimates the work would add almost 1.1 GW of capacity inside the PJM and MISO grid regions, enough to supply roughly 800,000 average U.S. homes. The commitment also leaves room for Constellation to add further uprates at other plants in its fleet later. Importantly, a conditional commitment is not a signed loan: Constellation still has to satisfy a list of technical, legal, environmental and financial conditions before DOE finalizes the financing documents and money actually changes hands.

Alliant’s $5.1 billion closes for Iowa and Wisconsin

A day later, on October 28, EDF said it had closed — not merely offered — $5.1 billion in loans to Alliant Energy’s two utility subsidiaries: about $1.6 billion to Wisconsin Power & Light and $3.5 billion to Interstate Power and Light. Unlike Constellation’s nuclear-only package, Alliant’s financing covers a mix of new gas-fired generation, battery storage and upgrades to existing plants, together expected to add more than 2.6 GW of capacity. DOE and Alliant frame the goal as holding down electricity costs and shoring up grid reliability for customers in Iowa and Wisconsin. Alliant had previously lined up as much as $3 billion in potential financing from the Biden-era Loan Programs Office, which EDF absorbed and rebranded.

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Washington’s bet on “commonsense” uprates

Energy Secretary Chris Wright described uprates as “commonsense energy addition policies” the administration is pursuing, tying the Constellation and Alliant deals to a broader DOE target: 5 GW of uprates and reactor restarts across the U.S. nuclear fleet, of which the department says 95% has now been identified. EDF’s own 2026-2030 strategic plan, which oversees more than $300 billion in combined loan authority, casts the push as part of a “nuclear renaissance” paired with affordability goals. The Constellation and Alliant deals follow a similar $4.2 billion conditional loan DOE offered Vistra Corp in October for uprates at its Ohio and Pennsylvania reactors, suggesting a pattern: rather than greenlighting new reactor construction, the administration is using low-cost federal financing to squeeze more megawatts out of plants that already exist.

Why utilities are racing to find extra megawatts

The urgency traces back to demand growth that utilities did not plan for a few years ago, led by data centers and AI computing. Constellation has already signed a 20-year, 890 MW power agreement with Google, part of deals with Google and Amazon that it says have unlocked more than $7 billion of investment for roughly 1,080 MW of nuclear capacity — struck entirely with private buyers, without federal financing. The DOE loans announced this week effectively extend that logic to the rest of the fleet: uprates can add gigawatt-scale capacity in a few years, far faster than permitting and building a new reactor, which is why both nuclear operators and conventional utilities like Alliant are now treating existing power plants as the fastest lever available to meet new load.

A rebranded lending arm with deep pockets

Energy Dominance Financing is the Trump administration’s rebrand of the Loan Programs Office (LPO), the DOE unit that financed early nuclear new-build and clean-energy projects under past administrations. The name changed, but the lending authority did not shrink: EDF’s current strategic plan gives it more than $300 billion to deploy between 2026 and 2030, and this week’s closings are its sixth and seventh utility financings of the year, following earlier loans to AEP Texas, Southern Co. and DTE Gas. DOE is counting the Alliant closing as its tenth completed financial close overall, a pace officials point to as evidence the program is moving faster than its predecessor.

None of the financial terms — interest rate, repayment schedule, or how quickly Constellation’s conditional commitment could convert into a signed loan — have been disclosed. Constellation has said publicly that the commitment does not represent a final decision on any individual plant or site, and it will need to clear DOE’s technical and environmental review before money is disbursed. For Alliant, the loans are already closed, meaning construction and procurement on the gas, storage and upgrade projects in Iowa and Wisconsin can proceed on the strength of federal financing already in hand.