Google’s 25-Year Deal Backs Iowa Nuclear Restart

In 2025, Google signed a 25-year power agreement with NextEra Energy covering the restart of Iowa’s 615MW Duane Arnold nuclear plant, which had been shut since 2020. The customer committed to a quarter-century of power from a reactor that could not yet produce it.

NextEra must finance, permit, connect and operate the plant before any of those megawatts can serve AI infrastructure.

A 25-year contract can carry a capital stack

The Department of Energy subsequently provided NextEra with a $1.9 billion refurbishment loan. Google supplies contracted demand, the DOE supplies debt, and NextEra undertakes the rehabilitation. The power agreement gives the debt a long-lived commercial structure.

Constellation Energy assembled the same pieces independently. Constellation plans to invest $1.6 billion to revive Three Mile Island, while Microsoft has agreed to buy all 835MW of the plant’s output under a reported 20-year exclusive agreement. Both utilities attached refurbishment programs to hyperscaler customers able to commit on the same time scale as the assets.

Google and Microsoft reached the same contract form through separate deals because hyperscalers can commit on an asset’s time scale. The pattern extends a broader shift in data-center financing: a 20- or 25-year buyer commitment can become part of the capital stack that creates capacity.

Restarts can move faster than new reactors

NextEra and Constellation are rehabilitating known industrial sites with operating histories. New-reactor developers must advance prospective projects before a plant can generate anything. Corporate contracts can support restart financing, while owners retain the physical, execution and regulatory work.

Constellation’s plan targets a 2028 restart. The gap between the 2024 agreement and that planned operating date leaves Constellation with refurbishment, execution and regulatory risk. Microsoft’s 20-year commitment can support the project through that interval, but contract duration cannot compress the physical work, and even the shorter restart path takes years.

Meta has applied long-term demand to a different transition. Its 20-year agreement with Constellation is scheduled to begin in mid-2027, when a 10-year Illinois state subsidy expires. Meta can assume part of the revenue role previously carried by public support without waiting for the plant to become dormant.

Plant owners now have two rehabilitation options. NextEra can convert a retired asset into contracted supply, while Constellation can roll an operating asset from expiring public support into corporate demand. One restores revenue after closure; the other preserves revenue continuity before closure becomes necessary.

NextEra is assembling power-ready campuses

In 2015, NextEra supplied 43MW of wind power for Google’s California headquarters. Its 2025 agreement covers a 615MW nuclear restart for 25 years. Across the decade, NextEra expanded both volume and role, from supplying electricity to one corporate location to shaping generation for a long-lived compute load.

NextEra and Google Cloud then expanded their partnership to develop data-center campuses across the United States. The same announcement said NextEra had secured more than 2.5GW of clean-energy contracts from Meta. NextEra now combines generation contracts, nuclear rehabilitation and campus development.

Campus development moves NextEra earlier into the compute supply chain. The utility can participate while Google Cloud assembles the site, power and data-center elements instead of waiting for a completed facility to request electricity. The commercial unit widens from a power purchase to a buildable campus whose generation and load must work together.

A headquarters contract discloses one site’s electricity consumption. By co-developing multiple campuses, NextEra can plan around where Google Cloud wants capacity, how much power those sites require and which generation assets can support the buildout.

A megawatt without a delivery path is not compute

Servers depend on electricity delivered through a specific site and interconnection, with operating procedures that remain stable when local generation or grid conditions change.

More than 200 data centers in the 30-square-mile Data Center Alley outside Washington consume roughly as much electricity as Boston. Facilities can add grid risk when they switch to local generators without announcing the disconnection. Those operating decisions matter independently of how much annual electricity an owner has contracted.

Operators are also building on-site power plants to bypass an overloaded grid amid permitting and supply-chain constraints. This off-grid energy-to-compute chain competes directly with the restart-and-interconnection route. An operator may prefer local generation when the grid cannot deliver contracted power on schedule.

Some corporate nuclear agreements cover output from a grid-connected plant rather than a dedicated line to one data center. Grid operators must still move and balance the electricity, and site developers must secure a workable interconnection, so shared grid infrastructure still determines delivery.

Hyperscalers now buy nuclear supply at three stages

Meta buys nuclear supply across all three stages. The company signed a 20-year deal for more than 2,600MW from three Vistra plants while also backing reactor projects from TerraPower and Oklo. One relationship purchases output from an operating fleet; the others support prospective supply.

NextEra and Constellation occupy the middle stage. Their dormant plants require capital and execution before delivering power, but they begin with existing sites and operating histories. Hyperscalers can allocate commitments across operating generation, restartable assets and prospective reactors instead of relying on one project schedule.

Each stage gives a different company a different task. Vistra must maintain productive operating plants. NextEra and Constellation must complete refurbishments and navigate restart requirements. TerraPower and Oklo must advance reactor projects. A portfolio gives the corporate buyer exposure to each stage without treating every nuclear megawatt as equally deliverable.

Google’s 25-year term reaches inside Duane Arnold’s economic life: NextEra can refurbish against it, and the DOE can lend alongside it. The 615MW become AI capacity only if NextEra restores the plant, regulators approve it and the grid delivers its output.