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Yes—but “backs” means federal support for nuclear power as a potential source of firm electricity for data centers, not a government order requiring private operators to build reactors. Federal officials have promoted nuclear energy and small modular reactors (SMRs) as part of the answer to rising AI electricity demand. Meanwhile, AWS, Microsoft, Google, Meta, Equinix and others are pursuing a mix of existing-plant contracts, planned restarts and future-reactor agreements.
The practical distinction matters: electricity from existing nuclear plants or long-term power contracts may be available sooner, while most new SMR proposals remain subject to licensing, financing, fuel, construction and grid hurdles.
What the federal government is actually backing
In May 2024, Rian Bahran of the White House Office of Science and Technology Policy discussed nuclear power—including SMRs—as a reliable and sustainable energy source for data centers. That was a clear policy signal, but it was not evidence of a single federal program dedicated to supplying private data centers with nuclear reactors.
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- Policy endorsement: Federal officials describe nuclear generation as firm, reliable and carbon-free at the point of electricity production.
- Federal funding: Government support may help reactor demonstrations, plant restarts, fuel production, research and related infrastructure.
- Regulatory reform: Policymakers may seek to streamline nuclear licensing, environmental review or grid-interconnection procedures.
- Plant preservation and restarts: Support for keeping existing reactors operating or returning retired plants to service can create power sooner than building new reactors.
- Private-sector enablement: Policy can reduce barriers for utilities, reactor developers and hyperscalers negotiating large power contracts.
It does not mean that the White House has ordered data centers to use nuclear power, that a private company can install a reactor without approval, or that nuclear projects bypass the Nuclear Regulatory Commission (NRC), state regulators, environmental review, grid rules or public participation.
The 2024 White House-linked discussion also cited data centers as using roughly 1% to 2% of U.S. annual electricity, with higher concentrations in some markets. That was a dated estimate attributed to the speaker, not a current official national statistic.
Why data centers are turning to nuclear power
AI training and inference can require far more electricity than conventional enterprise workloads. Large operators also need power that is available around the clock, with predictable voltage, frequency and capacity.
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Nuclear is attractive because existing plants already have generation equipment, transmission connections, industrial security and operating experience. Nuclear electricity is generally treated as carbon-free at the point of generation, although the full lifecycle includes mining, fuel processing, construction, decommissioning and spent-fuel management.
Renewable power-purchase agreements can reduce reported emissions, but wind and solar do not automatically provide firm 24-hour supply. They may need storage, overbuilding, transmission, demand flexibility or backup generation. Nuclear does not remove every reliability problem, but it can provide a firm component in a larger power portfolio.
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Three ways nuclear could power data centers
1. Colocation beside an operating plant
This is the most concrete near-term model. A data-center campus is developed next to an existing nuclear station and receives electricity through a power contract, a behind-the-meter structure or a grid-connected arrangement.
AWS, Talen and Susquehanna
In March 2024, AWS acquired Talen Energy’s Cumulus data-center campus in Pennsylvania in a transaction reported at $650 million. The campus sits next to Talen’s 2.5-gigawatt Susquehanna Steam Electric Station. A 48-megawatt data-center facility had been completed, while the broader campus was described as capable of expanding to as much as 960 MW.
Talen agreed to supply AWS under a 10-year power-purchase agreement, with extension options linked to nuclear-license renewals. This is important because the arrangement involved access to power from an operating plant—not waiting for a new reactor to be designed, licensed and built.
However, proximity does not guarantee unlimited capacity. In November 2024, the Federal Energy Regulatory Commission rejected a proposed amendment that would have increased the colocated AWS load from 300 MW to 480 MW. The decision showed that behind-the-meter or colocated arrangements can still raise questions about interconnection, reliability, transmission costs and whether other grid customers bear unfair costs.
Read the Cumulus transaction details and the FERC decision coverage.
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2. Long-term contracts from existing or restarted plants
A data center does not need to sit inside a nuclear facility’s physical footprint. It can contract for electricity from a plant through a long-term power-purchase agreement (PPA), subject to the contract’s delivery, capacity and regulatory terms.
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Microsoft and Three Mile Island
In September 2024, Microsoft signed a 20-year agreement with Constellation Energy for approximately 835 to 837 MW associated with the Three Mile Island site. The agreement was intended to support Microsoft’s data-center demand while enabling plans to restart the plant.
The wording matters: a signed PPA is not the same as delivered electricity. A restart still depends on licensing, operational preparations, financing and other milestones. The plant should therefore be described as subject to a planned or proposed restart unless current evidence confirms commercial operation.
See the Microsoft–Three Mile Island agreement.
3. New SMRs and microreactors
The third model is to build new reactors specifically for data-center or industrial loads. Developers argue that smaller, modular designs could offer more flexible siting and incremental expansion. But an SMR proposal is not an operating power source.
Projects must still address reactor licensing, construction approval, operating approval, specialized fuel, manufacturing capacity, financing, security, waste, water use, emergency planning and community consent. Industry coverage has warned that meaningful commercial SMR capacity may not arrive until the 2030s.
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The data-center nuclear projects are not all at the same stage
| Company or project | What was announced | What it does not prove |
|---|---|---|
| Amazon and Talen | AWS acquired the Cumulus campus beside the operating Susquehanna plant. | It does not mean the entire planned campus is already receiving nuclear electricity. |
| Microsoft and Constellation | A 20-year agreement tied to a planned Three Mile Island restart. | It does not prove that the restarted plant is already operating. |
| Meta | An RFP seeking up to 1.4 GW of new nuclear capacity. | An RFP is not a final investment decision or reactor order. |
| Google and Kairos Power | An agreement supporting future SMR deployment. | It is not an operating reactor supplying Google data centers. |
| Equinix and Oklo | An arrangement to procure up to 500 MW from future Oklo reactors, including a reported $25 million prepayment. | The reactors remain dependent on licensing, fuel, financing and construction. |
| AWS, Energy Northwest, Dominion and X-energy | Development and investment agreements involving advanced reactors. | These are long-term development commitments, not immediate capacity. |
| Standard Power and NuScale | Plans for up to two dozen SMRs across two campuses were reported in 2024. | The plans were proposals, not operating commercial reactors. |
Relevant reporting includes the 2024 data-center nuclear market overview, the Meta RFP, the Google–Kairos agreement, the Equinix–Oklo arrangement and AWS’s advanced-reactor agreements.
Why the FERC decision matters
The Susquehanna case illustrates why a data center cannot treat a nearby reactor as a private electrical outlet. A large colocated load may still interact with the regional transmission system and electricity market.
Regulators and utilities may ask:
- Who pays for transmission upgrades and grid services?
- Does the arrangement reduce or improve regional reliability?
- Will other customers pay costs associated with a dedicated technology load?
- What happens during refueling, maintenance or an unexpected reactor outage?
- Can the facility use dedicated generation while relying on the grid for backup and supplemental power?
The FERC action did not ban nuclear-powered data centers. It rejected a specific proposed interconnection amendment. That distinction is central to understanding the regulatory risk.
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Time to power
Existing-plant output, a colocated campus or a long-term PPA can potentially move faster than a new reactor. A new SMR, by contrast, must pass through design, licensing, financing, construction, fuel and commissioning milestones. Announced capacity should not be counted as delivered capacity.
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Even a nuclear-backed campus may rely on the regional grid for startup power, emergency service, maintenance periods, supplemental electricity, redundancy and balancing. It still needs UPS systems, backup generators, disaster recovery and carefully designed electrical redundancy.
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Fuel supply
Advanced reactors may require specialized fuels such as high-assay low-enriched uranium (HALEU) or TRISO fuel. Enrichment, fabrication, transport and long-term fuel availability can become strategic constraints. A federal nuclear buildout therefore requires more than reactor designs; it also requires a dependable fuel supply chain.
Safety and security
Developers may promote passive safety features in modern designs, but nuclear projects remain subject to NRC oversight, physical protection, cybersecurity, emergency planning, nuclear-material controls and public scrutiny. Data centers would also become high-value critical infrastructure targets.
Community and environmental concerns
Projects may face objections involving water consumption, thermal discharge, radioactive waste, emergency planning, land use, property values, ratepayer subsidies and perceived preferential treatment for large technology companies. “Carbon-free” does not mean impact-free.
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How operators should evaluate a nuclear-backed project
- Confirm the supply stage. Is the plant operating, contracted, awaiting a restart, under construction, in licensing, at the design stage or merely proposed?
- Identify the physical arrangement. Determine whether the deal is a physical PPA, virtual PPA, utility contract, behind-the-meter supply, colocated load, capacity contract or development-stage offtake agreement.
- Map the grid obligations. Review interconnection rights, transmission service, backup supply, curtailment rules, capacity charges and cost allocation.
- Check regulatory milestones. Separate design approval, construction approval, operating approval, environmental review and fuel qualification.
- Test outage planning. Nuclear plants still refuel and experience outages. The campus needs independent backup and a plan for sudden power loss.
- Review contract risk. Examine take-or-pay obligations, power caps, extension options, license-renewal conditions, delivery dates, replacement power and termination rights.
- Stress-test the load. AI workloads may ramp differently from traditional data-center demand. A contract designed for steady consumption may not match actual operations.
- Price the full system. Include backup generation, storage, transmission, fuel, cooling, water, security, compliance and decommissioning obligations—not just the headline electricity price.
Nuclear compared with other power options
| Option | Potential advantage | Main limitation |
|---|---|---|
| Existing nuclear plant or PPA | Firm, low-carbon generation with existing industrial infrastructure. | Availability, transmission rights, licensing and cost-allocation issues can limit expansion. |
| New SMR | Potentially modular and expandable for large industrial loads. | Long lead times, first-of-a-kind costs, fuel constraints and licensing uncertainty. |
| Renewables plus storage | Often faster to procure and useful for emissions reduction. | Requires storage, overbuilding, transmission or backup to provide firm 24-hour power. |
| Natural gas | Dispatchable and familiar to utilities and developers. | Emissions, fuel-price exposure, permitting risk and potential conflict with decarbonization goals. |
| Grid supply and flexible demand | Avoids private reactor ownership and can use workload shifting or curtailment. | Depends on available transmission, utility tariffs and the ability to make workloads flexible. |
| Geothermal, hydro and long-duration storage | Can provide firm or semi-firm low-carbon power in suitable regions. | Geographic availability and project-specific development constraints limit universal use. |
What this means for businesses and investors
There is no ordinary consumer subscription that guarantees “nuclear-powered” cloud computing. AWS, Microsoft Azure and Google Cloud sell cloud and AI services, not a public nuclear-electricity plan. Equinix, Talen, Constellation and reactor developers may be relevant to enterprise procurement, but the major arrangements are bespoke utility-scale contracts.
The reported $650 million AWS/Talen transaction and $25 million Equinix/Oklo prepayment are project-specific capital commitments, not retail prices or comparable service plans. Professional buyers should focus on delivery guarantees, regulatory conditions, replacement power, outage provisions and total infrastructure cost rather than the nuclear label alone.
For investors, the most important distinction is between announced capacity and commercially delivered capacity. A signed agreement, RFP, investment or reactor design can signal demand without proving that a data center will receive electricity on schedule.
The bottom line
The U.S. government is backing nuclear power as part of a broader strategy for meeting data-center and AI electricity demand. The support is best understood as policy advocacy, funding, fuel and regulatory enablement—not a dedicated federal mandate that hands private data centers nuclear power.
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