Small modular reactors (SMRs) are nuclear fission plants scaled to between 15 MW and 500 MW of output, designed for factory fabrication and modular on-site assembly. As dedicated data center power plants, they offer 24/7 carbon-free baseload generation with a land footprint up to 360 times smaller than wind, making them a structurally distinct alternative to gas turbines or large-scale renewables for hyperscale AI infrastructure.
Key Takeaways
- Google has contracted Kairos Power for up to seven SMRs totaling 500 MW, with the first unit targeted for 2030 and full deployment by 2035.
- U.S. data center power demand is projected to grow from 3% to 8% of total national consumption by 2030, driven primarily by AI workloads, according to Goldman Sachs.
- Broad commercial SMR availability for data centers is unlikely before the mid-to-late 2030s, despite near-term first-of-a-kind deployment targets.
The Demand Problem That Created the SMR Opportunity
Data center operators are confronting a power procurement crisis that conventional energy sources are struggling to resolve cleanly. According to Goldman Sachs, data center electricity demand is growing at approximately 15% annually from 2023 to 2030, with the sector’s share of total U.S. power consumption expected to rise from 3% to 8% over that period. The primary driver is AI inference and training workloads, which impose continuous, high-density power draws that are poorly matched to the intermittency of wind and solar generation.
Gas turbines can fill that gap, but they carry carbon liabilities that conflict with the net-zero commitments most major hyperscalers have made publicly. Large conventional nuclear plants offer a carbon-free baseload alternative, but they require decade-long construction timelines, multi-billion-dollar capital commitments, and transmission infrastructure that rarely aligns with where data centers need to be built. SMRs are being positioned as the answer to all three constraints simultaneously.
What SMRs Actually Offer Data Center Operators
The technical case for SMRs in dedicated data center applications rests on several concrete characteristics. Capacity ranges from 15 MW to 500 MW per unit, according to the American Society of Civil Engineers, which means a campus operator can match reactor deployment to phased data center buildout rather than overbuilding generation capacity upfront. Multiple units on a single licensed site also provide N+1 redundancy — a critical operational requirement for hyperscale facilities that cannot tolerate unplanned outages.
Water consumption is another differentiator. The American Nuclear Society cites SMR water usage at approximately 60 liters per megawatt-hour — roughly 50 times less than concentrated solar plants or traditional large nuclear facilities. For data center developers siting facilities in water-stressed regions of the American Southwest or Southeast, this is a material constraint, not a secondary consideration.
Land use is equally significant. SMRs require approximately 360 times less land than equivalent wind capacity and 75 times less than solar, according to the American Nuclear Society. For operators who need to co-locate generation with compute infrastructure on constrained industrial parcels, this changes the site selection calculus entirely.
Why it matters for builders: An SMR sited directly adjacent to a data center campus eliminates transmission loss, avoids grid interconnection queues — currently measured in years — and delivers firm capacity that renewable power purchase agreements cannot guarantee.
Who Is Actually Building: The Committed Players
The clearest signal of commercial intent came in 2024, when Google signed a power purchase agreement with Kairos Power for up to seven SMR units with a combined output of 500 MW. The first unit is targeted for commercial operation in 2030, with the full fleet online by 2035. Amazon and Microsoft have made comparable commitments to SMR developers during the same period, though specific unit counts and operational timelines vary by agreement.
There is also an existing precedent that is often underappreciated in coverage of this sector. Talen Energy’s Cumulus Data campus in Pennsylvania operates with a direct grid connection to the 2,500 MW Susquehanna nuclear plant. Amazon has secured large carbon-free power agreements from that facility. This is not a pilot program or a concept study — it is a functioning commercial arrangement demonstrating that nuclear-to-data-center power delivery works at scale today, using existing large reactor infrastructure.
The SMR developers themselves include Kairos Power, NuScale Power, X-energy, and TerraPower, among others. Each is at a different stage of NRC licensing, capital formation, and supply chain development. NuScale received NRC design certification for its VOYGR design, though the company subsequently cancelled its first commercial project in Idaho due to cost escalation — a cautionary data point that the sector has not fully absorbed.
| Power Source | Capacity Factor | Carbon Emissions | Land Use (relative) | Water Use (L/MWh) | Grid Dependence |
|---|---|---|---|---|---|
| SMR (nuclear) | ~90%+ | Zero operational | Lowest | ~60 | Can be islanded |
| Utility-scale solar | 20–30% | Zero operational | 75× more than SMR | Minimal | Grid or storage required |
| Wind | 30–45% | Zero operational | 360× more than SMR | Minimal | Grid or storage required |
| Natural gas (CCGT) | 85–90% | High | Low | High | Fuel supply dependent |
| Large conventional nuclear | ~90%+ | Zero operational | Low | High (~3,000) | Can be islanded |
Timeline Risks: Where the Business Case Gets Complicated
The 2030 target for Google’s first Kairos unit is an industry milestone, but it is a single first-of-a-kind deployment, not a market. Industry experts broadly caution that mid-2030s is the more realistic horizon for broad commercial SMR availability, and that widespread SMR-powered data center campuses are unlikely before the mid-to-late 2030s at the earliest.
The barriers are structural, not merely bureaucratic. NRC licensing for new reactor designs involves multi-year review cycles. High upfront capital costs — SMRs are not cheap per unit even if they are cheaper per project than gigawatt-scale plants — require long-term offtake agreements to attract project financing. Public skepticism and environmental litigation have historically extended nuclear project timelines in the United States by years. Grid interconnection, even for behind-the-meter configurations, involves utility coordination that adds additional permitting layers.
Supply chain constraints compound the problem. The specialized steel forgings, reactor pressure vessels, and instrumentation systems required for SMR construction have limited global manufacturing capacity. Scaling from one or two first-of-a-kind units to dozens of commercial deployments requires supply chain investment that has not yet been made at the necessary scale.
Why this matters for builders, developers, and investors
Any organization planning a hyperscale data center campus with a 2030 or later operational target needs to treat SMR power as a potential but not bankable primary source for that timeframe. The more immediate decision is whether to structure site selection, grid interconnection agreements, and interim gas or renewable capacity in a way that preserves optionality for SMR integration in the 2033–2038 window — without betting critical path timelines on regulatory and construction outcomes that remain genuinely uncertain.
Tools & Resources
- Seeking Alpha — Track SMR developer financials, utility nuclear agreements, and data center REIT power procurement disclosures.
- Benzinga — Follow breaking news on hyperscaler energy deals, NRC licensing decisions, and nuclear sector capital raises.
FAQ
When will small modular reactors be available to power data centers?
The first U.S. SMR deployment for a data center application is targeted for 2030, based on Google’s agreement with Kairos Power. However, industry experts consider mid-2030s more realistic for broad commercial availability, with widespread SMR-powered campuses unlikely before the mid-to-late 2030s.
Which companies are building small modular reactors for data centers?
Google has contracted Kairos Power for up to 500 MW across seven units. Amazon and Microsoft have made similar commitments to SMR developers. On the reactor side, active developers include Kairos Power, NuScale Power, X-energy, and TerraPower, each at different stages of NRC licensing and capital formation.
Why are data centers interested in nuclear power instead of solar or wind?
AI workloads require continuous, high-density power that solar and wind cannot reliably deliver without large-scale storage. SMRs provide 24/7 baseload generation with no carbon emissions, a capacity factor above 90%, and a land footprint up to 360 times smaller than equivalent wind capacity — directly addressing the operational requirements of hyperscale compute facilities.
What are the biggest risks to SMR deployment timelines?
The primary risks include multi-year NRC licensing reviews, high upfront capital costs requiring long-term financing structures, public opposition and environmental litigation, grid interconnection delays, and constrained global supply chains for specialized nuclear components. NuScale’s cancellation of its first commercial project due to cost escalation illustrates that these risks are not theoretical.
Is there an existing example of a data center powered by nuclear energy?
Yes. Talen Energy’s Cumulus Data campus in Pennsylvania operates with a direct connection to the 2,500 MW Susquehanna nuclear plant. Amazon has secured carbon-free power agreements from that facility, establishing a commercial precedent for nuclear-to-data-center power delivery at scale using existing large reactor infrastructure.
Sources
- American Nuclear Society — SMR land use, water consumption, and carbon-free generation characteristics cited in comparison with renewables
- American Society of Civil Engineers — SMR capacity range (15 MW to 500 MW) and modular deployment characteristics for data center applications
- Goldman Sachs — Data center power demand growth projection of 15% annually from 2023 to 2030, and forecast of sector share rising from 3% to 8% of U.S. power consumption
- Google / Kairos Power — Agreement for up to seven SMR units totaling 500 MW, with first unit targeted for 2030 and full deployment by 2035
- Talen Energy / Amazon — Cumulus Data campus nuclear co-location arrangement at the Susquehanna plant cited as existing commercial precedent
The business case for small modular reactors as dedicated data center power plants is structurally sound: the load profile matches, the carbon credentials are unambiguous, and the land and water efficiency advantages are real. What remains genuinely uncertain is execution — regulatory timelines, capital formation, and supply chain scaling are all variables that the sector has not yet resolved at commercial volume. For infrastructure developers and hyperscalers, the rational posture is to treat SMRs as a high-conviction medium-term option while maintaining near-term power strategies built on sources that can actually be contracted and delivered today. The 2030s will determine whether SMRs become the backbone of AI infrastructure power or remain a compelling technology perpetually arriving just over the horizon.