Nuclear Power for Data Centers: Why SMRs and Microreactors Are Reshaping the Firm-Power Equation

Data centers have quietly become one of the most power-intensive industrial categories on the planet. The combination of hyperscale cloud infrastructure, high-density compute workloads, and the insatiable appetite for always-on connectivity has driven operators into an uncomfortable confrontation with a fundamental constraint: the grid cannot always guarantee the firm, uninterrupted, carbon-accountable power that modern campuses require. Renewable energy contracts have absorbed the first wave of corporate sustainability commitments, yet the intermittency problem has never been fully resolved. Wind and solar can satisfy average load targets on paper while still leaving operations exposed to reliability gaps during peak demand or adverse weather. That structural tension is what makes advanced nuclear — specifically small modular reactors (SMRs) and microreactors — increasingly relevant to data-center procurement strategy.

Nexvora's assessment is that we are at an inflection point, not yet a revolution. The global market for SMRs, microreactors, and nuclear power as applied to data centers is estimated by Nexvora at US$1.5 billion to US$2.1 billion in 2025, with the majority of that value still concentrated in development-stage activity: engineering contracts, permitting processes, advisory mandates, and early commercial agreements rather than operational megawatts flowing to server halls. This is precisely what makes the next decade so consequential. The foundational work being done today — the regulatory submissions, the fuel-supply negotiations, the EPC framework agreements — will determine whether advanced nuclear becomes a mainstream data-center energy platform or remains a well-funded pilot category.

It is important to distinguish between the two principal product categories within this market, because their commercial trajectories and target customers are meaningfully different. Small modular reactors are generally defined as nuclear fission units with electrical output capacity below 300 megawatts, though many designs in active development fall in the 50 MW to 200 MW range. They are engineered for factory-based module manufacturing, simplified site construction, and eventual fleet replication across multiple locations. For data-center operators running or planning large-scale campuses — those requiring firm power blocks of 100 MW or more — SMRs represent the most plausible path to nuclear-backed, near-site or behind-the-meter power at meaningful scale.

Microreactors occupy a different niche. Defined typically as units below 20 MW of electrical output, and in some designs as low as 1 MW to 5 MW, they are engineered for extreme portability, autonomous operation, and deployment in environments where grid access is limited, unreliable, or uneconomic. Nexvora's analysis identifies the near-term commercial traction for microreactors in remote industrial sites, defense-adjacent installations, mining operations with islanded power grids, and edge-computing nodes that require reliable power but cannot wait for centralized grid upgrades. These customers share a common characteristic: the cost of unreliable power — measured in operational downtime, diesel logistics, or strategic risk — is high enough to justify the premium of early-generation nuclear alternatives. In the data-center context specifically, microreactors are most relevant to regional or edge facilities rather than hyperscale campuses.

Nexvora models the global SMR, microreactor, and nuclear-for-data-center market growing at a compound annual rate of 28% to 34% between 2025 and 2035, reaching an estimated US$19 billion to US$31 billion by the end of that period. To put that range in context: the width of the forecast band reflects genuine uncertainty around three variables that no model can resolve with precision — the pace of regulatory approval in key jurisdictions, the speed at which modular supply chains achieve cost discipline, and the degree to which hyperscale operators convert letter-of-intent commitments into binding project finance. The optimistic scenario assumes multiple first-of-a-kind projects achieving commercial operation by the late 2020s, triggering a replication effect that compresses unit costs and accelerates deployment into the early 2030s. The conservative scenario reflects a more familiar pattern in energy infrastructure: delays in licensing, cost overruns on pioneer projects, and a slower-than-expected build-out of specialized nuclear workforces.

What is not in doubt, in Nexvora's assessment, is the directionality of the market. Every major cloud and colocation operator is confronting the same demand-side mathematics: data-center load growth is outpacing both grid capacity additions and the deliverable supply of firm renewable power. Nuclear offers something genuinely distinct — capacity factors typically above 90%, fuel energy density that decouples output from weather, and a carbon profile that satisfies both regulatory reporting requirements and voluntary net-zero commitments. Nexvora estimates that by 2035, nuclear-backed electricity arrangements — including long-tenor power purchase agreements, utility-led builds, and dedicated generation assets — could support 8 GW to 14 GW of cumulative data-center-related contracted or dedicated capacity globally. That is a substantial number, though it is important to note that a meaningful share of that capacity will be sourced from existing large-scale nuclear plants operating under new commercial frameworks, with newly built SMRs and microreactors representing a growing but initially smaller share of that total.

Nexvora models North America as representing approximately 45% to 55% of global market value in 2025, a leadership position that reflects a convergence of favorable structural conditions rather than any single policy decision. The United States in particular combines hyperscale load concentration — with several of the world's largest data-center markets located in Virginia, Texas, Arizona, and the Pacific Northwest — with a set of institutional capabilities that matter enormously for advanced nuclear development. Nuclear-skilled utilities with operational experience, a private project finance community willing to take early-stage energy technology risk, regulatory frameworks that are actively evolving to accommodate SMR applications, and a defense procurement base that has created demand for microreactor technology in forward-operating environments all coexist in a way that is difficult to replicate quickly elsewhere.

Canada represents a meaningful secondary market within the region, with provincial utilities in Ontario and New Brunswick having made public commitments to SMR development that are among the most advanced outside the United States in terms of regulatory engagement and vendor selection. Outside North America, the United Kingdom, several Central and Eastern European economies seeking to reduce energy dependence on legacy suppliers, and select markets in the Asia-Pacific region — particularly those with existing nuclear infrastructure and strong industrial power demand — are the geographies Nexvora monitors most closely for near-to-medium-term commercial activity. The global distribution of market value is expected to become more balanced as the decade progresses, but North America's head start in both technical readiness and commercial deal-making is a durable advantage through at least the late 2020s.

Nexvora's analysis is unambiguous on one point: the binding constraints on this market are not on the demand side. Data-center operators want firm, clean, reliable power and are demonstrably willing to sign long-duration contracts to secure it. The constraints are entirely on the supply side, and they are interconnected in ways that make sequencing important. Licensing duration is the most frequently cited challenge, and with reason — nuclear regulatory processes in most jurisdictions are thorough by design, and even streamlined frameworks for SMR design certification typically require years of engagement before a construction permit is issued. First-project financing compounds this challenge because lenders and equity investors price pioneer-project risk at levels that can make early deployments appear uneconomic relative to alternatives, even when the long-run cost case is compelling.

Fuel supply security is a less publicly discussed but equally critical factor. Advanced SMR designs, particularly those using high-assay low-enriched uranium (HALEU), depend on enrichment capacity that is not yet available at commercial scale from Western suppliers. Supply chain qualification for the precision components required in modular reactor manufacturing — reactor pressure vessels, steam generators, instrumentation systems — requires years of vendor development and quality-assurance certification. And underlying all of these is the workforce question: nuclear engineering, construction, and operations expertise is a specialized resource that was not meaningfully expanded in most Western markets for decades. Nexvora's view is that the operators, developers, and utilities that begin addressing these supply-side constraints now — through early vendor partnerships, workforce development programs, and proactive regulatory engagement — will have a decisive commercial advantage when the market transitions from development-stage to operating-asset phase.

One of the more nuanced findings in Nexvora's research concerns the preferred commercial structures through which data-center operators are engaging with advanced nuclear. Outright reactor ownership — where a technology company directly owns and operates a nuclear generating asset — is the exception rather than the rule, and is likely to remain so in the near term for straightforward reasons. Nuclear operations require a specific regulatory license, a specialized workforce, and liability management frameworks that most technology companies have neither the appetite nor the institutional infrastructure to absorb. The far more common emerging model involves partnership structures: utility-led builds where the data-center operator is an anchor offtaker under a long-term power purchase agreement, developer-owned generation assets structured similarly to renewable independent power producers, and co-located energy campus arrangements where the nuclear asset sits adjacent to or within the data-center boundary but is operated by a licensed third party.

Implication for market participants: the commercial relationships being established today — the PPAs being drafted, the utility partnerships being negotiated, the co-development agreements being signed — are setting the contractual templates that will govern the majority of nuclear-data-center transactions for years to come. Early movers are not merely securing power; they are establishing the legal and commercial precedents that will shape what is possible for the entire market. Nexvora also observes that some of the most sophisticated operators are pursuing portfolio approaches — combining large-scale SMR offtake commitments for their flagship campuses with microreactor arrangements for edge or remote facilities — rather than betting exclusively on a single nuclear technology or deployment model.

Cost is the most contested dimension of the advanced nuclear conversation, and Nexvora approaches it with appropriate humility about the limits of forward modeling. What the evidence from analogous infrastructure categories — offshore wind, utility-scale solar, liquefied natural gas — consistently demonstrates is that first-of-a-kind projects carry cost structures that are unrepresentative of mature fleet economics. The learning curve effect is real, but it requires actual projects to be built and operated before it materializes. Nexvora models first commercial SMR projects carrying materially higher unit costs than later deployments in the same design family, with meaningful cost compression requiring standardized design approval from regulators, modular supply-chain maturity where factory production replaces bespoke site fabrication, and repeat EPC execution where construction teams accumulate project-specific experience.

The practical implication is that the economics of advanced nuclear for data centers will not be validated in a single landmark project. They will be validated — or refuted — across a sequence of projects, with each successive deployment providing the cost and performance data that either confirms the replication thesis or forces design and business-model adjustment. Nexvora's base case assumes that meaningful cost compression is achievable by the early-to-mid 2030s for the leading SMR designs, provided that first-of-a-kind projects move forward in the 2026 to 2029 window. Delays in that first wave push the entire cost-compression timeline to the right, which is one of the primary reasons that regulatory and financing speed matters so much more than it might appear from the outside.

Nexvora's overall assessment is that the convergence of advanced nuclear technology and data-center energy demand represents one of the more durable structural opportunities in the energy-infrastructure landscape over the next decade. The market is real, the demand-side drivers are powerful and growing, and the technology, while not without risk, is advancing on multiple fronts simultaneously. What distinguishes this moment from previous cycles of nuclear optimism is the identity of the buyers: large, creditworthy, strategically motivated technology companies with the capital capacity and long planning horizons to underwrite the patient, complex deals that advanced nuclear requires. That customer profile changes the risk calculus for developers, utilities, and investors in ways that were not present in earlier waves of nuclear interest.

For business leaders evaluating their exposure to this market — whether as potential offtakers, technology developers, capital providers, supply-chain participants, or policy stakeholders — Nexvora recommends a structured engagement approach. Monitor regulatory milestones closely, because licensing progress in key jurisdictions will be the most reliable leading indicator of commercial timing. Assess supply-chain positioning early, because the specialized components and services required for SMR development are already attracting competitive interest. And evaluate partnership structures now, before the first wave of commercial projects creates a seller's market for nuclear project access. The companies that treat advanced nuclear as a near-term operational planning question rather than a long-range technology watch item will be significantly better positioned when the market's development phase ends and its operating-asset phase begins.