[ { "stable_id": "org-opg", "name": "Ontario Power Generation", "org_type": "operator", "country": "CA", "summary": "Canadian Crown utility deploying BWRX-300 at Darlington New Nuclear Project.", "sources": [ "src-cnsc-darlington" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.opg.com/", "aliases": [ "OPG" ], "roles": [ "operator", "utility" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "Province of Ontario Crown corporation; not a reactor-developer listing.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "ontario-power-generation" }, { "stable_id": "org-gevh", "name": "GE Vernova Hitachi Nuclear Energy", "org_type": "vendor", "country": "US", "summary": "Vendor of the BWRX-300 boiling-water SMR. Tracked deployments include OPG Darlington Unit 1 and TVA Clinch River.", "sources": [ "src-cnsc-darlington", "src-iaea-aris" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.gevernova.com/nuclear", "aliases": [ "GE Hitachi Nuclear Energy", "GE Vernova Hitachi", "GEVH" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "mixed", "ownership_notes": "Nuclear JV / business under GE Vernova and Hitachi structures. Parent GE Vernova is publicly listed (NYSE: GEV) but that ticker is NOT assigned to this SMR vendor entity.", "ownership_verified_date": "2026-10-01", "parent_relationships": [ { "related_name": "GE Vernova", "relationship": "parent_or_affiliate", "as_of": "2026-10-01", "notes": "Listed parent context (NYSE: GEV); not a subsidiary IPO.", "source": "src-iaea-aris" }, { "related_name": "Hitachi", "relationship": "parent_or_affiliate", "as_of": "2026-10-01", "notes": "Hitachi participation in nuclear JV lineage.", "source": "src-iaea-aris" } ], "milestones": [], "unresolved": [ "Exact current legal-entity ownership percentages between GE Vernova and Hitachi not restated here." ], "slug": "ge-vernova-hitachi-nuclear-energy" }, { "stable_id": "org-terrapower", "name": "TerraPower", "org_type": "vendor", "country": "US", "summary": "Privately held developer of the Natrium sodium fast reactor with molten-salt energy storage. First commercial unit under construction pathway at Kemmerer, Wyoming.", "sources": [ "src-terrapower-fundraise-2025", "src-nrc-terrapower", "src-iaea-aris" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.terrapower.com/", "aliases": [ "Natrium" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": "src-terrapower-fundraise-2025", "listing_verified_date": "2026-10-01", "ownership_control": "private", "ownership_notes": "June 2025 company statement after $650M fundraise: will continue to be privately held. Rechecked 2026-10-01; no IPO identified in this pass.", "ownership_verified_date": "2026-10-01", "milestones": [ { "date": "2025-06-18", "text": "Closed $650M fundraise; reiterated privately held status.", "source": "src-terrapower-fundraise-2025" } ], "unresolved": [ "Exact Natrium CP ML citation still pending higher-confidence ADAMS link." ], "parent_relationships": [], "slug": "terrapower" }, { "stable_id": "org-kairos", "name": "Kairos Power", "org_type": "vendor", "country": "US", "summary": "Privately held developer of fluoride-salt-cooled high-temperature reactors (Hermes demonstration series) with NRC construction permits for Hermes 1 and Hermes 2.", "sources": [ "src-nrc-kairos-hermes" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://kairospower.com/", "aliases": [ "Kairos" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "private", "ownership_notes": "No public listing identified as of 2026-10-01 review.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "kairos-power" }, { "stable_id": "org-xenergy", "name": "X-energy", "org_type": "vendor", "country": "US", "summary": "Publicly listed developer of the Xe-100 high-temperature gas-cooled SMR and TRISO fuel manufacturing. First tracked U.S. deployment pathway is the Long Mott / Dow Seadrift project in Texas.", "sources": [ "src-xenergy-sec-ex99-2026", "src-nrc-xenergy-dow", "src-iaea-aris" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://x-energy.com/", "aliases": [ "X-Energy, Inc.", "X-energy", "XE" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "publicly_listed", "exchange": "Nasdaq", "ticker": "XE", "listing_source": "src-xenergy-sec-ex99-2026", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "X-Energy, Inc. began Nasdaq Global Select trading under XE on 2026-04-24; Up-C structure with X-Energy Reactor Company, LLC operating subsidiary.", "ownership_verified_date": "2026-10-01", "milestones": [ { "date": "2026-04-24", "text": "Began trading on Nasdaq as XE; IPO closed 2026-04-27.", "source": "src-xenergy-sec-ex99-2026" }, { "date": "2026-05", "text": "NRC EA/FONSI reported for Long Mott (secondary press; prefer ADAMS primary).", "source": "src-nrc-xenergy-dow" } ], "unresolved": [ "Prefer NRC ADAMS primary citation for Long Mott EA/FONSI ML number." ], "parent_relationships": [], "slug": "x-energy" }, { "stable_id": "org-dow", "name": "Dow", "org_type": "operator", "country": "US", "summary": "Industrial host/customer for the proposed Long Mott / Seadrift Xe-100 deployment with X-energy \u2014 not a reactor vendor.", "sources": [ "src-nrc-xenergy-dow" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.dow.com/", "aliases": [], "roles": [ "customer", "industrial_host" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Dow Inc. is a publicly traded industrial company, but SMRMap does not assign Dow equity ticker here. Dow is not the reactor developer.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "dow" }, { "stable_id": "org-oklo", "name": "Oklo Inc.", "org_type": "vendor", "country": "US", "summary": "Publicly listed advanced fission company developing Aurora fast fission powerhouses and related fuel recycling. First Aurora unit advancing under the DOE Reactor Pilot Program at Idaho National Laboratory.", "sources": [ "src-oklo-overview", "src-oklo-nyse-2024", "src-oklo-pdsa-2026" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://oklo.com/", "aliases": [ "Oklo", "OKLO" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "publicly_listed", "exchange": "NYSE", "ticker": "OKLO", "listing_source": "src-oklo-nyse-2024", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Listed via May 2024 business combination with AltC Acquisition Corp.; trades as OKLO.", "ownership_verified_date": "2026-10-01", "milestones": [ { "date": "2024-05", "text": "Began trading on NYSE as OKLO.", "source": "src-oklo-nyse-2024" }, { "date": "2026-06", "text": "DOE approved Aurora-INL Preliminary Documented Safety Analysis.", "source": "src-oklo-pdsa-2026" } ], "unresolved": [], "parent_relationships": [], "slug": "oklo-inc" }, { "stable_id": "org-nuscale", "name": "NuScale Power", "org_type": "vendor", "country": "US", "summary": "Publicly listed U.S. vendor of VOYGR integral PWR SMR plants. U.S. design certification/SDA history; Romania multi-module deployment advancing; former UAMPS Carbon Free Power Project cancelled in 2023.", "sources": [ "src-nuscale-investors", "src-wna-smr", "src-energynote-2026" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.nuscalepower.com/", "aliases": [ "NuScale Power Corporation", "SMR" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "publicly_listed", "exchange": "NYSE", "ticker": "SMR", "listing_source": "src-nuscale-investors", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Publicly traded NuScale Power Corporation; ticker SMR is the listed company, not a subsidiary alias.", "ownership_verified_date": "2026-10-01", "milestones": [ { "date": "2023-11", "text": "UAMPS Carbon Free Power Project cancelled (tracked separately).", "source": "src-wna-smr" } ], "unresolved": [], "parent_relationships": [], "slug": "nuscale-power" }, { "stable_id": "org-rolls-royce-smr", "name": "Rolls-Royce SMR", "org_type": "vendor", "country": "GB", "summary": "UK PWR SMR developer (not independently listed). Generic Design Assessment in progress; Wylfa selected for early units. Shareholder base updated after Constellation exit in December 2025.", "sources": [ "src-rr-smr-shareholder-update", "src-energynote-2026", "src-wna-smr" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.rolls-royce-smr.com/", "aliases": [ "RR SMR", "Rolls-Royce Small Modular Reactors" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": "src-rr-smr-shareholder-update", "listing_verified_date": "2026-10-01", "ownership_control": "mixed", "ownership_notes": "Rolls-Royce SMR Ltd is not independently listed. Parent Rolls-Royce plc is listed (LSE: RR. / OTC context) but that ticker is not assigned here. April 2026 shareholder update: Constellation exited December 2025; remaining shareholders reported as Rolls-Royce plc, \u010cEZ Group, BNF Resources, Qatar Investment Authority.", "ownership_verified_date": "2026-10-01", "parent_relationships": [ { "related_name": "Rolls-Royce plc", "relationship": "controlling_shareholder", "as_of": "2025-12", "notes": "Major industrial shareholder; exact % not restated here.", "source": "src-rr-smr-shareholder-update" }, { "related_name": "\u010cEZ Group", "relationship": "shareholder", "as_of": "2025-12", "notes": "Shareholder after Constellation exit.", "source": "src-rr-smr-shareholder-update" }, { "related_name": "BNF Resources", "relationship": "shareholder", "as_of": "2025-12", "notes": "Acquired part of Constellation stake with Rolls-Royce plc.", "source": "src-rr-smr-shareholder-update" }, { "related_name": "Qatar Investment Authority", "relationship": "shareholder", "as_of": "2025-12", "notes": "Remaining shareholder per company update.", "source": "src-rr-smr-shareholder-update" }, { "related_name": "Constellation", "relationship": "former_shareholder", "as_of": "2025-12", "notes": "Sold sub-5% stake in December 2025.", "source": "src-rr-smr-shareholder-update" } ], "milestones": [ { "date": "2025-12", "text": "Constellation exited; stake acquired by Rolls-Royce plc and BNF Resources.", "source": "src-rr-smr-shareholder-update" } ], "unresolved": [], "slug": "rolls-royce-smr" }, { "stable_id": "org-arc", "name": "ARC Clean Technology", "org_type": "vendor", "country": "CA", "summary": "Canadian developer of the ARC-100 sodium fast reactor proposed with NB Power at Point Lepreau.", "sources": [ "src-cnsc-nbpower" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.arc-cleantech.com/", "aliases": [ "ARC" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "private", "ownership_notes": "No public listing identified as of 2026-10-01.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "arc-clean-technology" }, { "stable_id": "org-nbpower", "name": "NB Power", "org_type": "utility", "country": "CA", "summary": "New Brunswick utility proposing ARC-100 at Point Lepreau.", "sources": [ "src-cnsc-nbpower" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.nbpower.com/", "aliases": [ "New Brunswick Power" ], "roles": [ "operator", "utility" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "Provincial Crown utility.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "nb-power" }, { "stable_id": "org-tva", "name": "Tennessee Valley Authority", "org_type": "utility", "country": "US", "summary": "U.S. federal utility pursuing Clinch River BWRX-300 and related advanced reactor options.", "sources": [ "src-cnn-smr-explained", "src-energynote-2026" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.tva.com/", "aliases": [ "TVA" ], "roles": [ "operator", "utility" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "U.S. federal corporation; not a listed reactor developer.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "tennessee-valley-authority" }, { "stable_id": "org-cnnc", "name": "China National Nuclear Corporation", "org_type": "vendor", "country": "CN", "summary": "Chinese state nuclear vendor/operator group behind ACP100 (Linglong One) and related designs; also linked to HTR-PM vendor context.", "sources": [ "src-wna-smr", "src-pris" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.cnnc.com.cn/", "aliases": [ "CNNC" ], "roles": [ "reactor_developer", "vendor", "operator" ], "listing_status": "unknown", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "Chinese state nuclear group. Some affiliated entities may be listed on Chinese exchanges; those tickers are NOT assigned to this organization record.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [ "Do not infer listed-subsidiary tickers as CNNC group listing." ], "parent_relationships": [], "slug": "china-national-nuclear-corporation" }, { "stable_id": "org-huaneng", "name": "China Huaneng Group", "org_type": "operator", "country": "CN", "summary": "Operator context for the HTR-PM demonstration at Shidaowan.", "sources": [ "src-cae-htrpm", "src-pris" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "aliases": [ "China Huaneng" ], "roles": [ "operator" ], "listing_status": "unknown", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "State-owned operator context for HTR-PM; listed affiliates may exist but are not assigned here.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "china-huaneng-group" }, { "stable_id": "org-cnea", "name": "CNEA (Argentina)", "org_type": "government_agency", "country": "AR", "summary": "Argentine commission leading the CAREM-25 prototype SMR.", "sources": [ "src-wna-smr", "src-iaea-aris" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "aliases": [ "Comisi\u00f3n Nacional de Energ\u00eda At\u00f3mica", "CNEA" ], "roles": [ "reactor_developer", "government" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "Argentine national atomic energy commission.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "cnea-argentina" }, { "stable_id": "org-rosatom", "name": "Rosatom", "org_type": "vendor", "country": "RU", "summary": "Russian state nuclear corporation behind KLT-40S floating plant, RITM series, and BREST-OD-300.", "sources": [ "src-rosatom-lomonosov", "src-wna-smr" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.rosatom.ru/", "aliases": [ "ROSATOM", "State Atomic Energy Corporation Rosatom" ], "roles": [ "reactor_developer", "vendor", "operator" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "state_controlled", "ownership_notes": "Russian state nuclear corporation; not treated as a Western exchange listing. Some affiliates may have local listings \u2014 not assigned here.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "rosatom" }, { "stable_id": "org-holtec", "name": "Holtec International", "org_type": "vendor", "country": "US", "summary": "Privately held developer of SMR-300 (SMR-160 lineage) with a proposed deployment near Palisades, Michigan.", "sources": [ "src-energynote-2026", "src-wna-smr" ], "confidence": "medium", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://holtecinternational.com/", "aliases": [ "Holtec" ], "roles": [ "reactor_developer", "vendor" ], "listing_status": "privately_held", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "private", "ownership_notes": "Privately held; no independent public listing identified as of 2026-10-01.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [ "Palisades-area host/operator arrangements remain lightly sourced in this release." ], "parent_relationships": [], "slug": "holtec-international" }, { "stable_id": "org-uamps", "name": "Utah Associated Municipal Power Systems", "org_type": "utility", "country": "US", "summary": "Former offtaker for the cancelled Carbon Free Power Project (NuScale VOYGR).", "sources": [ "src-wna-smr" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "aliases": [ "UAMPS" ], "roles": [ "customer", "utility" ], "listing_status": "not_applicable", "exchange": null, "ticker": null, "listing_source": null, "listing_verified_date": "2026-10-01", "ownership_control": "unknown", "ownership_notes": "Municipal power systems association; former offtaker for cancelled CFPP.", "ownership_verified_date": "2026-10-01", "milestones": [], "unresolved": [], "parent_relationships": [], "slug": "utah-associated-municipal-power-systems" }, { "stable_id": "org-nano-nuclear", "name": "NANO Nuclear Energy", "aliases": [ "NANO Nuclear Energy Inc.", "NNE" ], "org_type": "vendor", "roles": [ "reactor_developer", "vendor" ], "country": "US", "summary": "U.S. publicly listed advanced nuclear company developing portable microreactor concepts (including ZEUS/ODIN lineages in company materials) plus related fuel and consulting lines. No deployment projects are tracked in this SMRMap release yet \u2014 absence here does not mean no projects exist elsewhere.", "listing_status": "publicly_listed", "exchange": "Nasdaq", "ticker": "NNE", "listing_source": "src-nano-ipo-sec", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Nasdaq Capital Market listing under NNE since May 2024 IPO; still listed as of August 2026 company update.", "ownership_verified_date": "2026-10-01", "parent_relationships": [], "milestones": [ { "date": "2024-05-08", "text": "Began trading on Nasdaq Capital Market as NNE; IPO closed 2024-05-10.", "source": "src-nano-ipo-sec" } ], "unresolved": [ "Specific licensed deployment sites are not yet included in this dataset." ], "sources": [ "src-nano-ipo-sec", "src-nano-ir-2026" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://nanonuclearenergy.com/", "slug": "nano-nuclear-energy" }, { "stable_id": "org-terrestrial", "name": "Terrestrial Energy", "aliases": [ "Terrestrial Energy Inc.", "IMSR" ], "org_type": "vendor", "roles": [ "reactor_developer", "vendor" ], "country": "US", "summary": "Developer of Integral Molten Salt Reactor (IMSR) small modular plants. Publicly listed on Nasdaq as IMSR after October 2025 business combination with HCM II. No deployment projects are tracked in this SMRMap release yet.", "listing_status": "publicly_listed", "exchange": "Nasdaq", "ticker": "IMSR", "listing_source": "src-terrestrial-nasdaq-imsr", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Began Nasdaq trading as IMSR on 2025-10-29 following HCM II combination completed 2025-10-28.", "ownership_verified_date": "2026-10-01", "parent_relationships": [], "milestones": [ { "date": "2025-10-29", "text": "Began trading on Nasdaq as IMSR (warrants IMSRW).", "source": "src-terrestrial-sec-8k" } ], "unresolved": [ "No site-specific deployment project yet curated into this release." ], "sources": [ "src-terrestrial-nasdaq-imsr", "src-terrestrial-sec-8k", "src-iaea-aris" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.terrestrialenergy.com/", "slug": "terrestrial-energy" }, { "stable_id": "org-bwxt", "name": "BWX Technologies", "aliases": [ "BWXT", "BWX Technologies, Inc." ], "org_type": "vendor", "roles": [ "reactor_developer", "vendor", "manufacturer" ], "country": "US", "summary": "NYSE-listed nuclear manufacturer and advanced reactor developer. Direct reactor-development role via the BWXT Advanced Nuclear Reactor (BANR) HTGR microreactor (DOE ARDP) and related advanced reactor work, in addition to component manufacturing for the broader industry. No civilian deployment project is plotted in this SMRMap release yet; military Janus pathway is noted as context only.", "listing_status": "publicly_listed", "exchange": "NYSE", "ticker": "BWXT", "listing_source": "src-bwxt-commercial-nuclear-2025", "listing_verified_date": "2026-10-01", "ownership_control": "public_shareholders", "ownership_notes": "Public company BWX Technologies, Inc. (NYSE: BWXT).", "ownership_verified_date": "2026-10-01", "parent_relationships": [], "milestones": [ { "date": "2026-08-26", "text": "U.S. Army/DIU Janus program selected BANR (20 MWe variant); groundbreaking target late 2028 \u2014 not mapped as a civilian SMRMap pin.", "source": "src-bwxt-janus-2026" } ], "unresolved": [ "Janus/Fort Campbell pathway is defense-context and not yet a curated civilian map project." ], "sources": [ "src-bwxt-commercial-nuclear-2025", "src-bwxt-banr", "src-bwxt-janus-2026" ], "confidence": "high", "last_checked": "2026-10-01", "review_state": "verified", "website": "https://www.bwxt.com/", "slug": "bwx-technologies" } ]