The U.S. Department of Energy has closed a $5.1 billion loan package for Alliant Energy to expand power generation and upgrade existing facilities across Iowa and Wisconsin, finalizing financing that has grown substantially since its initial announcement in January 2025.
The package will support new natural gas-fired generation, battery energy storage systems and improvements to existing power plants. The projects are expected to add more than 2.6 gigawatts of new or upgraded generation capacity and deliver more than $1 billion in electricity cost savings, according to the department.
Alliant Energy separately projects up to $1.2 billion in cumulative customer savings over the loans’ 30-year term. The company also expects the projects supported by the financing to create more than 1,600 local construction jobs.
The financing covers two Alliant Energy utility subsidiaries: Interstate Power and Light in Iowa and Wisconsin Power and Light. The company can draw on the financing to advance eligible projects, subject to the applicable loan agreements and project requirements.
A financing package that changed direction
The final agreement differs materially from the federal financing proposal announced in January 2025. At that time, the Department of Energy’s Loan Programs Office outlined conditional commitments exceeding $3 billion to support approximately 2,000 megawatts of wind generation and battery storage in Iowa and Wisconsin.
The package that reached financial close in October 2026 is larger and places greater emphasis on natural gas-fired generation, while retaining battery storage and upgrades to existing facilities.
That shift reflects a different generation strategy. Gas-fired plants can provide dispatchable electricity when demand rises or weather-dependent generation falls, while batteries can store electricity and discharge it when needed. Upgrades to existing facilities can also increase available capacity without requiring every investment to take the form of an entirely new power plant.
Alliant’s announced development portfolio includes the Bobcat Energy Center in Marshalltown, the Morgan Valley Energy Center in Linn County and the Riverhawk Energy Center in Cerro Gordo County, Iowa. Its plans also include upgrades to existing generating stations in Wisconsin. These facilities form part of the company’s wider investment program; the overall financing announcement should not be interpreted as confirmation that every listed project has completed construction or entered service.
What the financing means for electricity customers
The projected savings are a central part of the financing case. Lower-cost federal borrowing can reduce the financing expense associated with large capital projects, potentially helping a regulated utility limit the costs passed on to customers.
However, the announced savings remain projections over the life of the loans. They are not immediate reductions in electricity bills, and the final outcome will depend on project costs, construction schedules, financing terms and regulatory treatment.
The additional capacity also does not mean that 2.6 gigawatts of entirely new generation will come online at once. The department’s figure combines new generation with capacity improvements at existing facilities. The resulting contribution to the grid will depend on when individual projects are completed and how they operate.
The loan package is being administered through the Department of Energy’s Office of Energy Dominance Financing, formerly known as the Loan Programs Office. The department said the transaction marks the administration’s tenth financial close and the sixth and seventh utility financings completed through the program.
For Iowa and Wisconsin, the package provides a financing framework for a broad set of electricity infrastructure investments. Its ultimate effect on reliability and household bills will become clearer as the individual projects advance through development, construction and operation.
Project factsheet
- Financing: $5.1 billion loan package
- Borrower group: Alliant Energy subsidiaries Interstate Power and Light and Wisconsin Power and Light
- Federal agency: U.S. Department of Energy, Office of Energy Dominance Financing
- States: Iowa and Wisconsin
- Project types: Natural gas-fired generation, battery storage and upgrades to existing generating facilities
- Expected capacity addition or improvement: More than 2.6 GW
- Projected customer savings: More than $1 billion according to DOE; up to $1.2 billion according to Alliant Energy
- Loan term: 30 years
- Expected construction employment: More than 1,600 local jobs projected by Alliant Energy
- Financial close: October 2026
Related energy development
The Alliant Energy financing is one example of how utilities are funding new electricity capacity and improving grid reliability. Michigan offers a different model: DTE Energy has brought its 132-MW Fish Creek Solar Park into operation using voluntary customer contributions through its MIGreenPower program.
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