{"docs":"https://www.nuclearnewsnetwork.com/tracker","terms":"History surfaces — append-only milestone logs, event/change feeds, and full JSON snapshots — are provided under the NNN Data License Terms (https://www.nuclearnewsnetwork.com/data-license): journalism, research, citation and AI answering are expressly permitted royalty-free with attribution; systematic bulk extraction, dataset redistribution, and embedding in commercial products or training corpora require a commercial license.","terms_url":"https://www.nuclearnewsnetwork.com/data-license","attribution":{"text":"Nuclear News Network, \"NNN Reactor Project Tracker\", https://www.nuclearnewsnetwork.com/tracker","url":"https://www.nuclearnewsnetwork.com/tracker"},"unit":{"slug":"natrium-kemmerer-1","name":"Natrium Demonstration (Kemmerer)","plant":"Kemmerer Power Station","unit":1,"country":"US","region":"north-america","reactor_type":"SFR","design":"Natrium (sodium-cooled fast reactor + molten salt storage)","capacity_mw_net":345,"is_smr":true,"vendor":"TerraPower","owner_operator":"TerraPower / PacifiCorp offtake","epc":"Bechtel (2020–2026; full-scope EPC contract under rebid)","vendor_id":"org:terrapower","owner_operator_ids":["org:terrapower"],"epc_ids":["org:bechtel"],"design_id":"design:natrium","site_id":"site:kemmerer","status":"under_construction","construction_start":"2024-06-10","original_cod_target":2030,"current_cod_estimate":2031,"milestones":[{"date":"2024-06-10","event":"Non-nuclear construction began at Kemmerer, Wyoming","source":"https://www.terrapower.com/"},{"date":"2026-03-04","event":"NRC issued Part 50 construction permit — first commercial non-light-water US power reactor permit in 40+ years","source":"https://www.energy.gov/ne/articles/nrc-issues-construction-permit-terrapowers-natrium-advanced-reactor"},{"date":"2026-04-23","event":"Nuclear construction officially commenced; owner expects construction complete by February 2031","source":"https://www.terrapower.com/TerraPower-Commences-Construction-on-Americas-First-Utility-Scale-Advanced-Nuclear-Power-Plant"},{"date":"2026-09-15","event":"Bechtel files Virginia WARN notice: ~200 Reston HQ positions affected, reductions from ~Nov 16; cites failure to agree with TerraPower on the project's next phase","source":"https://www.ans.org/news/article-8417/terrapower-bechtel-part-ways-on-natrium-project/"},{"date":"2026-09-22","event":"Bechtel and TerraPower part ways; TerraPower to rebid the ~$4B EPC contract. Bechtel stays to complete the Sodium Test & Fill Facility; 2030 completion / 2031 operation targets reaffirmed","source":"https://www.world-nuclear-news.org/articles/bechtel-steps-away-from-terrapower-project"}],"sources":["https://www.terrapower.com/","https://www.ans.org/news/article-8417/terrapower-bechtel-part-ways-on-natrium-project/","https://www.world-nuclear-news.org/articles/bechtel-steps-away-from-terrapower-project","https://www.enr.com/articles/63689-terrapower-reopens-epc-competition-for-4b-natrium-nuclear-project"],"last_verified":"2026-09-28","verified":true,"confidence":"high","notes":"First US utility-scale advanced reactor in construction; coal-to-nuclear flagship. HALEU supply is the program watch item. EPC transition Sep 2026 (operator + WNN + ANS + ENR provenance). TerraPower-Meta framework for up to 8 units and Hyundai E&C as fleet EPC reported Sep 2026 — single source each, not asserted.","tags":["usa","advanced-reactor","terrapower","sfr","doe-arpd"],"updated_at":"2026-09-28","slippage_years":1}}