Small modular reactors spent 2024 and 2025 as a story about promise. By the middle of 2026, that story had shifted: construction permits were being issued, hyperscalers were signing gigawatt-scale power deals, and the first commercial units were entering hot testing on two continents. For the SMR business community, 2027 is shaping up to be less about announcements and more about delivery — the year several first-of-a-kind projects either pour concrete and reach criticality, or quietly slip. Here are five dynamics worth tracking closely.
1. Regulatory Approvals Move From Rare to Routine
The U.S. Nuclear Regulatory Commission finalized its streamlined Part 53 licensing framework for advanced reactors in March 2026, and the pipeline behind it is thickening fast. NuScale remains the only design with full NRC certification, now covering an uprated 77 MWe module approved in May 2025, while TerraPower’s Natrium project in Kemmerer, Wyoming, received the NRC’s first-ever construction permit for a commercial non-light-water reactor in March 2026 and broke ground the following month. Kairos Power has now started nuclear construction on both its Hermes and Hermes 2 units in Oak Ridge, Tennessee. Industry tracker smrintel.com counted 15 of 29 active NRC dockets approved as of early August 2026. The question for 2027 is whether Part 53 genuinely compresses review timelines for the next wave of applicants, including Dow’s X-energy Xe-100 project in Seadrift, Texas, or whether the backlog simply moves further downstream.
2. AI Data Centers Are Now the Industry’s Financing Engine
Hyperscalers have collectively signed for close to 9.8 gigawatts of advanced nuclear capacity, according to smrintel.com’s deal tracker: Meta leads with roughly 5.2 GW across TerraPower and Oklo, followed by data-center operators at 2.2 GW, Amazon at about 960 MW, Microsoft at 835 MW, and Google at 500 MW — including Kairos Power’s Hermes 2 output, which is contracted to reach a Google data center via a power purchase agreement with the Tennessee Valley Authority. Microsoft’s Three Mile Island restart remains the only one of these deals already under construction. The International Energy Agency reports data-center electricity demand rose 17% in 2025 and projects global consumption could nearly double, from about 485 TWh in 2025 to roughly 950 TWh by 2030. For SMR developers, these offtake agreements have effectively become the bankable revenue base that project financing depends on — watch how many convert from memoranda of understanding into firm, priced contracts in 2027.
3. HALEU Fuel Supply Is Still the Tightest Choke Point
Almost every advanced reactor design under construction needs high-assay low-enriched uranium, fuel enriched to 5–20% U-235, and the domestic supply chain has not caught up with reactor construction schedules. The Department of Energy’s HALEU Availability Program, backed by roughly $700 million from the Inflation Reduction Act, has issued conditional fuel commitments to developers including Kairos Power, TRISO-X, Westinghouse, TerraPower, and others, with Centrus Energy expanding domestic enrichment capacity. Kairos Power finalized its DOE HALEU contract for Hermes in partnership with Los Alamos National Laboratory in early 2026. Even so, smrintel.com’s 2026 industry report flags fuel availability as the sector’s single largest bottleneck. For 2027, the number to watch isn’t reactor count — it’s kilograms of qualified HALEU actually delivered, and whether fuel fabrication capacity scales in step with construction milestones.
4. Capital Markets Reopen for Nuclear
After years of financing SMRs primarily through DOE grants and strategic corporate stakes, public markets are re-engaging. X-energy filed a draft S-1 in March 2026 for a Nasdaq listing under the ticker XE, targeting roughly $300 million and building on more than $1.4 billion in total funding, including a $700 million strategic investment from Amazon. Holtec International confidentially filed for an IPO in February 2026, reportedly targeting a valuation above $10 billion, and Last Energy closed a Series C round exceeding $100 million in December 2025. Sector-wide funding reached an estimated $7.5 billion year-to-date by early August 2026, per smrintel.com. Meanwhile, incumbents with SMR exposure — Constellation Energy and BWRX-300 maker GE Vernova among them — give investors a lower-risk way into the theme. 2027 will test whether public markets are willing to underwrite pre-revenue nuclear developers, or whether IPO windows stay narrow and strategic offtake partners remain the primary funding source.
5. The Global Race Separates Builders From Talkers
China’s Linglong One (ACP100) is on track to become the world’s first land-based commercial SMR, having completed hot testing ahead of a first-half-2026 startup target. Ontario’s BWRX-300 at Darlington became North America’s first SMR under active construction, and a $40 billion U.S.–Japan partnership announced in March 2026 aims to bring 3 GW of BWRX-300 capacity to Tennessee and Alabama. Europe is organizing around the European Commission’s nine-point SMR strategy and proposed “SMR Valleys,” while the UK’s BWRX-300 cleared a major regulatory assessment in December 2025. TerraPower expects to pour first nuclear-related concrete at Kemmerer in 2027, with fuel load targeted for 2030. As more projects move from renderings to rebar, 2027 will start sorting genuine first movers from developers still waiting on financing, fuel, or a signed customer.
For more insights and market analysis of SMRs in 2027, download the SMR Market Intelligence Report 2027
