AlphaOS

What is small modular reactor technology?

AlphaOS investment intelligence · Research and education only — not investment advice · Updated Sep 27, 2026

About nuclear-energy

Direct answer

Small modular reactors (SMRs) are nuclear fission reactors with a power output of up to 300 megawatts electric (MWe) — roughly one-third the capacity of conventional large-scale reactors — designed for factory fabrication, modular assembly, and flexible deployment. Unlike traditional gigawatt-scale nuclear plants that require $10–20 billion and 15+ years to build, SMRs are engineered for standardized production at lower upfront capital cost, faster construction timelines of 3–5 years, and scalability through unit addition. Leading developers include NuScale Power (SMR-160 design), TerraPower (Natrium sodium-cooled fast reactor), X-energy (Xe-100 pebble bed), and Rolls-Royce SMR in the UK. The technology is gaining momentum as data center operators and utilities seek reliable, carbon-free baseload power to meet surging electricity demand driven by AI infrastructure.

This week

Companies with new signals this week

METAgrowth ranks with an opportunity score of 90, driven primarily by growth signals.90MXLgrowth ranks with an opportunity score of 89, driven primarily by growth signals.89

2 of 24 shown

See the full board →

Key Takeaways

  • SMRs are defined by the International Atomic Energy Agency (IAEA) as reactors producing under 300 MWe, with 'micro' reactors producing under 10 MWe representing an even smaller subset
  • NuScale Power received the first-ever NRC design approval for an SMR in the U.S. in 2022, though its Carbon Free Power Project in Idaho was cancelled in 2023 due to cost escalation — a cautionary signal for the sector
  • TerraPower's Natrium reactor in Wyoming (backed by Bill Gates) broke ground in 2024, with commercial operation targeted for the early 2030s
  • Microsoft signed a landmark agreement with Constellation Energy in 2023 to restart Unit 1 of Three Mile Island, and has also engaged with Helion Energy for fusion; Amazon and Google have signed SMR power purchase agreements, signaling Big Tech as a key demand driver
  • The U.S. Department of Energy has committed over $3 billion in funding to advanced nuclear and SMR programs through the Advanced Reactor Demonstration Program (ARDP)
  • SMR capital costs are projected at $3,000–$6,000 per kilowatt of installed capacity at scale, compared to $7,000–$12,000/kW for conventional large nuclear plants — though these projections remain unvalidated by completed commercial builds
  • Rolls-Royce SMR is targeting UK deployment with a 470 MWe design, having received government backing as part of Britain's energy security strategy, with first unit targeted for the 2030s
  • Key risks include regulatory licensing timelines, first-of-a-kind construction cost overruns, public opposition, nuclear waste management, and the unproven nature of factory-build economics at commercial scale

Evidence & Analysis

  • The IAEA tracks 80+ SMR designs in various stages of development across more than 18 countries as of 2024
  • The U.S. Energy Information Administration projects U.S. electricity demand to grow by 20%+ over the next decade, driven by data centers, EV adoption, and industrial electrification — creating structural baseload demand SMRs could address
  • China's ACPR50S and HTR-PM (high-temperature gas-cooled reactor) are the only SMRs currently connected to a commercial grid, with the HTR-PM achieving grid connection in December 2023
  • The Advanced Reactor Demonstration Program (ARDP) awarded $80 million to TerraPower and $80 million to X-energy in 2020 as initial cost-shared grants toward full demonstration builds
  • Global SMR market size is estimated at $72–$150 billion by 2040 by various energy research firms, contingent on successful first-of-a-kind builds validating economics
  • NuScale's UAMPS project cancellation cited a projected cost increase from $58/MWh to $89/MWh — illustrating the unresolved cost competitiveness challenge versus natural gas combined cycle at $40–60/MWh

Key Companies

SMR

NuScale Power Corporation

Only publicly traded pure-play SMR developer in the U.S.; holds first NRC-approved SMR design certification

CEG

Constellation Energy Corporation

Largest U.S. nuclear operator; restarting Three Mile Island Unit 1 under a 20-year Microsoft PPA; positioned to operate SMR fleets

VST

Vistra Corp

Nuclear and power generation operator exploring advanced nuclear as part of clean baseload portfolio expansion

BWXT

BWX Technologies

Key SMR component manufacturer and nuclear services provider; supplies reactor components and fuel for U.S. government and commercial programs

OKLO

Oklo Inc.

Advanced fission microreactor developer backed by Sam Altman; targeting data center and remote power markets with Aurora reactor design

Related stock research

Connected companies and research pages from the AlphaOS knowledge graph.

Priority stock research

High-intent stock intelligence pages — connected from AlphaOS research hubs.

Related stock research

Structured stock intelligence for companies connected to this research.

Related Questions

Generated by AlphaOS from the Knowledge Graph, earnings intelligence, and industry analysis. Content is for research and education only — not investment advice.