US approves $1.9B loan to restart an Iowa nuclear plant for Google's AI data centers

The US Department of Energy closed a $1.9 billion loan last week to NextEra Energy to restart the Duane Arnold Energy Center, a 615-megawatt nuclear plant in Linn County, Iowa that has been offline since a 2020 derecho knocked down its cooling towers. Google has signed a long-term power purchase agreement to take the plant's full output for its AI data centers. NextEra says the facility will be back in service by 2029.

The deal is the first concrete financing under the Energy Department's plan to restart three mothballed US nuclear plants to feed both the grid and the AI build-out, and it lands awkwardly against Google's 2018 carbon-neutral electricity pledge. The mechanism doing the work is a federal-underwriting bridge: public money revives retired nuclear capacity so hyperscalers can keep their "clean" labels while AI training clusters consume more electrons than the grid can easily hand them.

Duane Arnold was already scheduled for decommissioning when a derecho packing 140 mph gusts swept through the site on August 10, 2020 and took out the cooling towers. NextEra's pitch for bringing it back rests on three claims: grid reliability for the Cedar Rapids region, a long-term fixed-price power contract that buffers Google against volatile wholesale markets, and what the company calls "thousands of direct and indirect jobs" in construction and operations. The jobs figure is NextEra's own framing from earlier project materials, not an independent count.

The federal piece is what turns this from a corporate PPA into a policy story. DOE loan guarantees have historically been reserved for new clean-energy construction, where the agency absorbs the technology and offtake risk that private lenders would not. Restarting a retired reactor puts restart nuclear inside the same financing envelope, with the federal balance sheet covering the construction and license-amendment risk that would otherwise price a private deal out. The $1.9 billion loan is small relative to typical new-build nuclear cost, and current US projects run several times that. That gap is exactly the point: the math works only because the reactor, the grid interconnect, and most of the original NRC license already exist.

The Federal Register environmental assessment filings for the Duane Arnold restart are now public, and the NRC reactor information page tracks the licensing trail. A 2029 in-service date is NextEra's plan; the actual restart will turn on NRC license amendments, the EA's final finding, and the spent-fuel storage path. Restarted reactors do not get a fresh waste solution: Duane Arnold would store its used fuel on site in the same pools and dry casks the original license authorized, an issue the DOE press materials do not address.

Google reached its first carbon-neutral electricity year in 2018 by stacking renewable PPAs on top of its existing load. Eight years later, the same playbook is harder to scale: peers including Meta and Tesla have leaned on dirtier grid mix or behind-the-meter gas to feed new AI clusters, and Google has itself signed a separate natural-gas deal for a Texas data center. A federally underwritten restart reactor lets the company book the megawatt-hours as carbon-free without forcing the issue of new gas or new renewables on the same timeline.

The open question is what the next two restart deals look like. Duane Arnold is the easiest of the three to revive because the site, the staff, and the original NRC license are still in place; a restart at a fully decommissioned site would face a different licensing curve and a different cost. The DOE has not named the other two plants. The April 2026 Federal Register notice on the Duane Arnold transfer is on the docket now. The test of whether this financing structure travels will come when the next DOE restart deal closes, not when Duane Arnold restarts in 2029.