Can Small Modular Reactors Meet Data Center Power Demand?

Yes—technically. An SMR can supply enough electricity for anything from a smaller data center to a multi-gigawatt hyperscale campus, depending on the reactor design and number of units. But SMRs are unlikely to solve most data-center power shortages in the near term. Licensing, construction, financing, fuel supply, grid connections, cooling, security, and outage planning mean they are better viewed as a selective long-term option than a plug-and-play replacement for grid capacity.

Why data centers need so much electricity

“Data center” can describe a facility with a demand of a few megawatts or a hyperscale campus requiring hundreds of megawatts. AI training and inference workloads are pushing the upper end of that range higher because high-density servers operate continuously and require substantial cooling and power-conditioning equipment.

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The U.S. Department of Energy describes current data-center designs ranging from roughly 10 MW to 1 GW, with future facilities potentially reaching 4 GW or more. Those figures describe facility-scale demand, not necessarily the electricity reaching servers alone. Cooling, power conversion, networking, backup systems, and other auxiliary loads must also be included.

The relevant question is therefore not simply whether an SMR’s nameplate capacity matches a server load. A developer must also model:

• Continuous baseload demand and expected load factor.
• Peak demand and ramp rates.
• Power-quality requirements.
• Reserve capacity and electrical redundancy.
• Planned reactor outages and unexpected trips.
• Cooling and water infrastructure.
• The campus’s expansion schedule.

Demand is growing quickly. A 2025 Lawrence Berkeley National Laboratory update cited by DOE estimates that U.S. data centers could consume 11.8% of total U.S. electricity by the end of the decade, with a modeled range of 9.5% to 15.3%. That is a projection, not a guarantee that every proposed campus will be built.

The International Energy Agency expects global data-center electricity use to double by 2030, while electricity use by AI-focused data centers is expected to triple. The bottleneck is not generation alone. Grid connections, transformers, turbines, chips, planning approvals, and construction capacity can all delay a project.

What an SMR can actually provide

Small modular reactor is an umbrella term, not a single standardized product. Designs vary in size, fuel, coolant, safety systems, licensing path, construction method, and commercial timetable.

Reactor or facility	Indicative output	Data-center implication
NuScale module	77 MWe	One or more modules could support a smaller campus, subject to reserves and auxiliary loads.
NuScale six-module plant	462 MWe	Could serve a large campus or multiple customers.
Holtec SMR-300	300 MWe net per unit	One unit could serve a substantial campus, with surplus, reserves, or grid exports depending on the site.
Large hyperscale campus	Hundreds of megawatts to 1 GW	Could require several modules or units plus grid support and backup.
Future multi-gigawatt campus	1 GW to 4 GW or more	Would require a nuclear complex, a hybrid portfolio, or both.

The DOE says NuScale’s NRC-approved uprated module is 77 MWe, with six modules totaling 462 MWe. The NRC describes Holtec’s SMR-300 as a 300-MWe-net design.

A 100-MW data center could theoretically be matched by two 77-MWe modules, but that arithmetic is incomplete. Reactor auxiliaries, power-conversion losses, cooling systems, electrical redundancy, reserve margins, and planned outages reduce the power available for IT loads. A 1-GW campus would require multiple units or modules and still need transmission, reserve capacity, maintenance coverage, and backup generation.

Why nuclear power is attractive for data centers

Firm, high-utilization generation

Data centers need electricity around the clock. Nuclear reactors can generate continuously under normal operating conditions and are not dependent on sunlight or wind at the moment power is needed. That makes nuclear a potential source of firm power for high-load-factor campuses.

“Continuous” does not mean interruption-proof. Reactors require refueling outages and can experience unexpected trips. A critical data center still needs grid support, batteries, backup generators, fuel supplies, or another redundant source.

Low operational carbon emissions

Nuclear generation can help a data-center operator reduce dependence on gas-fired electricity while pursuing carbon targets. The accurate description is low-carbon, not emissions-free in every accounting boundary. Mining, fuel processing, construction, maintenance, and decommissioning have lifecycle emissions.

High energy density

A nuclear plant can produce large amounts of electricity from a comparatively compact generation site. That can be valuable where land, transmission corridors, and storage capacity are limited. It does not remove the need for switchyards, substations, cooling equipment, security areas, emergency planning, or transmission rights.

Potential price visibility

Nuclear fuel is generally a smaller component of total nuclear-generation costs than construction, financing, operations, and labor. A long-term power contract could provide price visibility, but only if construction and financing risks are controlled. An SMR’s projected operating cost is not the same as a fixed delivered price for a data center.

Modular expansion

In principle, a developer could add reactor modules as a campus expands. That is one of the central promises of the SMR model. In practice, the benefit depends on repeated orders, an approved design, qualified suppliers, available fuel, manufacturing capacity, and a site capable of supporting additional units.

Why SMRs may not solve the immediate power shortage

The schedule mismatch

AI campuses are being planned and energized on timelines often measured in a few years or less. A first-of-a-kind nuclear project must pass regulatory review, obtain financing, complete site work, build and test the plant, secure fuel, connect to the grid, and demonstrate safe operation.

DOE says widespread commercial deployment of next-generation reactors is likely in the 2030s. That does not mean no reactor can operate earlier, but it does mean most near-term data-center growth is more likely to rely on existing nuclear plants, natural gas, coal, renewables, storage, grid upgrades, and hybrid arrangements.

Factory construction may reduce schedule risk after designs and supply chains are proven. It does not automatically make first units fast. The first commercial units still carry design-completion, licensing, manufacturing, construction, commissioning, and financing risk.

First-of-a-kind costs

An SMR project can include:

• Design-completion and engineering costs.
• Licensing and environmental-review costs.
• New manufacturing infrastructure.
• Site preparation and cooling systems.
• Nuclear security and emergency planning.
• Construction and commissioning risk.
• Interest accumulated during a long construction period.
• Fuel, waste, decommissioning, and long-term operating obligations.

DOE identifies the high price of initial deployments as a major barrier. Modular production could reduce future costs, but that is a result to be demonstrated through repeated deployment—not a guarantee built into the word “modular.”

Licensing remains material

The U.S. Nuclear Regulatory Commission has reported faster reviews for several advanced-reactor projects. Its milestones include an 18-month safety review for TerraPower’s Kemmerer construction permit, a 22-month review for NuScale’s US460 standard-design approval, planned 17-month review milestones for TVA’s Clinch River BWRX-300 construction permit, and a completed 21-month review for Kairos Hermes 1.

These are regulatory-review milestones, not complete project timelines. They do not include all pre-application work, environmental review, hearings, financing, construction, fuel loading, testing, grid interconnection, or commercial operation. The NRC’s licensing-efficiency information should therefore not be read as a promise that an approved design is ready to power a particular campus.

As of August 18, 2026, the NRC had issued TerraPower a construction permit for Kemmerer Power Station Unit 1 on March 9, 2026, and had accepted Holtec’s phased construction-permit and limited-work-authorization application for a dual-unit SMR-300 project at Palisades on February 13, 2026. A construction permit or application acceptance is not commercial operation.

Fuel and supply-chain constraints

Advanced reactors depend on enrichment and fuel-fabrication capacity that may not be available at the scale or timing required by a large reactor pipeline. Projects can also face long lead times for nuclear-grade components, specialized forgings, pressure vessels, steam systems, pumps, valves, control systems, and instrumentation.

A licensed design and a factory capable of producing many completed units are different milestones. Fuel contracting should be treated as a critical-path item rather than a procurement detail to address after construction.

Grid constraints do not disappear

An on-site reactor does not automatically bypass the electricity system. A campus may still need connection studies, substations, switchyards, protection systems, transmission upgrades, balancing-authority coordination, black-start arrangements, and rules governing exported power.

Behind-the-meter generation can also produce disputes over transmission costs, utility exit charges, reliability obligations, reserve requirements, and whether dedicated infrastructure shifts costs to other ratepayers. DOE cites the Federal Energy Regulatory Commission controversy around Amazon and Talen’s proposed co-location arrangement at the Susquehanna nuclear plant as an example of these issues.

Four ways nuclear could serve data centers

1. Grid-connected SMR serving a region

The reactor sells electricity to the grid, while the data center buys power through ordinary utility or market arrangements.

This separates nuclear and data-center operations and lets the plant serve multiple customers. It may also simplify ownership. However, the data center remains exposed to transmission constraints, market rules, congestion, and the availability of capacity at its location.

2. Co-located data center and nuclear plant

A campus could be built beside a reactor, potentially sharing site infrastructure and a long-term power contract. Shorter transmission distances may be valuable, and surplus generation could serve other customers.

Co-location also creates complexity. Nuclear security and data-center physical-security requirements must coexist. The campus needs independent backup power, because a reactor outage cannot be allowed to interrupt critical workloads. Local opposition, water use, emergency planning, and environmental review can affect both projects.

3. Behind-the-meter nuclear generation

In a behind-the-meter arrangement, the data center receives power directly from the generating facility rather than relying entirely on the public grid. That can be commercially attractive, but it remains subject to utility, reliability, market, environmental, and nuclear regulation.

The parties must resolve transmission-cost responsibility, backup and reserve obligations, metering, utility tariffs, grid-export rights, and what happens when the reactor is unavailable. “Behind the meter” does not mean “outside regulation.”

4. Existing nuclear plant plus a new data center

This may be more realistic in the near term than waiting for a new SMR. Existing nuclear plants already have operating experience, trained personnel, established regulatory structures, and grid connections.

That does not mean spare power is automatically available. A project must evaluate existing capacity, transmission rights, cooling capability, outage schedules, local approvals, and whether the plant can support a new load without harming reliability for existing customers.

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What current announcements actually prove

Current activity demonstrates serious commercial interest, not a mature SMR-powered data-center market. The IEA reports that the pipeline of conditional offtake agreements between data-center operators and SMR projects grew from 25 GW at the end of 2024 to 45 GW by 2026. Conditional is the important word: these agreements are not equivalent to completed reactors or delivered electricity.

A 2025 Urenco report lists announced or developing data-center-related projects involving Amazon and X-energy at 5 GW, Standard Power and NuScale at 1.8 GW, Equinix and Oklo at 0.5 GW, Google and Kairos at 0.5 GW, and Amazon/Energy Northwest and X-energy at 0.3 GW.

Those figures should be read through a milestone ladder:

1. Announced interest.
2. Memorandum or framework agreement.
3. Conditional offtake agreement.
4. Site or early-work authorization.
5. Construction permit.
6. Reactor under construction.
7. Fuel loaded and testing completed.
8. Commercial operation.

Only the later stages demonstrate actual electricity delivery. The NuScale 2025 Form 10-K, for example, describes a negotiated maximum sale price for each module delivered and installed in a contemplated ENTRA1 project, subject to adjustments. That is not a universal public price for SMR electricity.

The economics: compare delivered power, not reactor slogans

The relevant comparison is not an SMR’s projected levelized cost of electricity against the headline price of solar panels. A data-center developer should compare the full cost of delivering reliable power at the required location and opening date.

• Capital cost and financing during construction.
• Construction-duration and delay assumptions.
• Fuel and operating costs.
• Transmission, interconnection, and grid-upgrade charges.
• Backup generation and reserve capacity.
• Cooling and water infrastructure.
• Security, insurance, waste, and decommissioning obligations.
• Power-purchase-agreement escalation and inflation provisions.
• Costs incurred if the data center opens before the reactor.

An SMR can offer long-term price visibility only if the commercial contract allocates construction and delay risk clearly. A vendor estimate, government-supported demonstration, conditional agreement, or projected LCOE is not the same as a binding fixed price for delivered electricity.

Reliability and outage planning

No critical data center should depend on one reactor without backup. The planning questions include:

• What happens during refueling?
• How quickly can the campus respond to an unexpected reactor trip?
• Will the site retain a grid connection?
• Are gas turbines, batteries, fuel cells, or another nuclear plant available?
• Does the design require N+1 or 2N electrical redundancy?
• Can workloads be moved to another region?
• Can the reactor load-follow, or will the data center need to maintain a relatively stable demand profile?

The correct comparison is SMR plus backup and grid support versus an alternative firm-power portfolio—not SMR versus no backup.

Cooling and water constraints

Both sides of the project need heat rejection. Data centers consume electricity for cooling, while nuclear plants require cooling systems to remove reactor heat. Water availability can constrain the combined site, especially in hot or water-stressed regions.

Dry or hybrid cooling may reduce water consumption, but it can increase cost or reduce efficiency during hot weather. Using reactor heat for absorption chilling is technically interesting, but it adds integration complexity and should not be treated as a standard commercial configuration. Total water use depends on climate, reactor design, cooling technology, operating mode, and data-center architecture.

SMR alternatives

For many projects, the better answer will be a portfolio rather than a single generating asset. Alternatives include:

• Existing nuclear plants, uprates, or nuclear power-purchase agreements.
• Large conventional nuclear projects.
• Natural-gas generation for interim or balancing capacity.
• Renewables combined with storage and firming resources.
• Geothermal and hydroelectric power where available.
• Fuel-cell generation.
• Demand response and geographic workload shifting.
• More efficient servers, power distribution, and cooling.
• Hybrid systems combining grid supply, existing nuclear, gas, renewables, storage, and future SMRs.

The practical comparison is usually not SMR versus solar. It is the complete portfolio required to provide reliable, affordable, low-carbon electricity at the campus’s location and opening date.

A due-diligence checklist for developers and investors

Power and technical fit

• What is the net electric output rather than gross output?
• How many units are required after auxiliary loads and reserves?
• What are the expected capacity factor, outage duration, and outage frequency?
• What are the ramp-rate, voltage, power-quality, islanding, and black-start capabilities?
• Can the site support cooling and water requirements?

Schedule

• Is the design licensed in the relevant country?
• Is the specific site licensed?
• Has construction begun?
• Are the EPC contractor, supply chain, and fuel suppliers contracted?
• Is the commercial-operation date supported by a credible schedule and contingency plan?

Economics

• Is the price a binding commercial offer or a preliminary estimate?
• Who pays for delay, cost overruns, and replacement power?
• What are the financing, escalation, transmission, backup, waste, and decommissioning costs?
• What happens if the campus cannot absorb all reactor output?

Regulation and legal structure

• Are construction and operating approvals in place?
• What emergency-planning, security, cybersecurity, insurance, and liability requirements apply?
• Are water permits, environmental reviews, and state or local approvals complete?
• How will behind-the-meter power be treated under utility tariffs and reliability rules?

Commercial credibility

• Does the vendor have an operating reactor fleet or a completed reference plant?
• Can it actually manufacture the promised number of units?
• Is the customer commitment binding?
• What government support and parent-company financial strength back the project?
• Are there contractual remedies if the reactor is late?

Time-horizon verdict

Before 2030: Existing nuclear, grid upgrades, natural gas, renewables, storage, and hybrid systems are more likely to provide most incremental data-center capacity.

Early to mid-2030s: First advanced-reactor projects may begin serving selected industrial and data-center customers, but the timing will depend on licensing, financing, construction, fuel, and site execution.

Longer term: Repeated, standardized SMR deployments could become a meaningful source of dedicated firm power if costs and construction schedules improve.

So, can SMRs meet data-center power demand? They can meet the demand technically, but only selected projects are likely to make sense commercially. For a facility that needs electricity within one to three years, an unbuilt SMR is usually a poor primary plan. For a large campus with a long development horizon, suitable land and cooling, strong financing, regulatory support, and a credible backup strategy, an SMR could eventually be part of a reliable low-carbon power system.

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