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US closes federal loan to restart Iowa's Duane Arnold nuclear plant

US closes federal loan to restart Iowa's Duane Arnold nuclear plant

Built World

Department of Energy commits up to $1.9 billion; 615-megawatt reactor targets early 2029 return

4 days ago: DOE closes $1.9 billion loan

Overview

Updated 3 days ago

A shuttered Iowa nuclear plant is getting federal money to come back online. The Department of Energy closed a loan of up to $1.9 billion on September 8 to help NextEra Energy restart the Duane Arnold Energy Center, which a 2020 derecho knocked offline.

The 615-megawatt reactor is set to return to the grid in early 2029, pending approval from the Nuclear Regulatory Commission. Google will buy most of the output under a 25-year power purchase agreement, part of a wave of data-center demand that is pushing utilities to revive retired reactors.

Why it matters

If Duane Arnold returns on schedule, restarting old reactors becomes a proven template for powering AI data centers without new fossil generation.

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Key Indicators

$1.9B
DOE loan commitment
Up to $1.9 billion from the Office of Energy Dominance Financing to fund the restart.
615 MW
Restart capacity
Baseload power the plant will add to the grid, enough for roughly 500,000 homes.
90%
Output contracted to Google
Share of electricity going to Google under the 25-year power purchase agreement.
~1,500
Construction jobs
Jobs supported during construction, plus more than 450 permanent positions in operations.

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People Involved

Organizations Involved

Timeline

August 2020 September 2026

5 events Latest: 4 days ago
Tap a bar to jump to that date
  1. DOE closes $1.9 billion loan

    Latest Financing

    Office of Energy Dominance Financing commits up to $1.9 billion to fund the restart.

  2. Iowa approves restart certificate

    Regulatory

    Iowa Utilities Commission issues generating certificate; a lawsuit follows.

  3. Google signs 25-year power deal

    Agreement

    NextEra announces the restart plan with Google as anchor customer for most output.

  4. Plant retires permanently

    Decision

    NextEra decides the repair cost is not worth it after 45 years of operation.

  5. Derecho knocks Duane Arnold offline

    Incident

    A severe windstorm damages the plant, forcing shutdown of Iowa's only nuclear reactor.

Scenarios

1

NRC clears restart, Duane Arnold returns online in early 2029

Likely Resolves by Q2 2029

Discussed by: DOE officials and NextEra leadership

The NRC completes its licensing review, construction finishes on schedule, and the plant delivers power to Google under the 25-year agreement. NextEra says major permits are secured and remaining items are routine. DOE projects the restart will create nearly 1,500 construction jobs and support 450 permanent ones.

2

Court overturns generating certificate, stalling the project

Possible Resolves by Q2 2027

Discussed by: Parties to the Iowa lawsuit; Iowa Capital Dispatch

The legal challenge to the Iowa Utilities Commission's June 2026 certificate succeeds. Construction pauses while the case is reheard or appealed, pushing the restart beyond 2029. NextEra says it expects to resolve the case but has not detailed its legal strategy.

3

Schedule slips as licensing and costs drag on

Possible Resolves by End of 2029

Discussed by: Industry analysts tracking restart economics

NRC review takes longer than expected or restart costs exceed projections, pushing commercial operation into 2030. The project stays alive but misses its early-2029 target. NextEra has declined to give total restart cost, saying only that it runs to multiple billions of dollars.

Historical Context

2 moments from history that rhyme with this story — and how they unfolded.

2022-2026

Palisades Nuclear Plant restart (2022-2026)

Michigan's 805-megawatt Palisades reactor closed in May 2022 under owner Entergy. Texas-based Holtec International bought the plant and won a $1.5 billion federal loan commitment, aiming to become the first company ever to restart a decommissioned US nuclear plant.

Then

The restart faced repeated schedule slips and cost growth but remains the leading test of US reactor revival.

Now

Palisades established the regulatory and financial path later restarts now use.

Why this matters now

Duane Arnold is the third attempt following this path, and its loan is the largest so far.

2024-2026

Three Mile Island Unit 1 restart (2024-2026)

Constellation Energy shut the 837-megawatt Pennsylvania reactor in 2019. In 2024 it struck a power deal with Microsoft and announced plans to restart, then secured a $1 billion federal loan for the work.

Then

The project is the first restart tied to a major tech power purchase, with a target return in the late 2020s.

Now

It set the template of tech companies backing nuclear restarts with long-term contracts and federal financing.

Why this matters now

Duane Arnold follows the same playbook: a shuttered plant, an anchor tech buyer, and government money.

Sources

(11)