2026-09-25 — NRC and DOE issue the final environmental clearance for the Three Mile Island/Crane restart

• The Nuclear Regulatory Commission and the Department of Energy issued a final environmental assessment and finding of no significant impact for reauthorizing power operations at the Christopher M. Crane Clean Energy Center, formerly Three Mile Island Unit 1 The NRC is separately deciding whether to grant an exemption and three license amendments Constellation Energy requested, and DOE’s Office of Energy Dominance Financing is deciding on a loan guarantee for refueling; Constellation’s 2024 20-year power purchase agreement commits the reactor’s 835 megawatts to Microsoft’s data centers on the PJM grid. This finalizes a draft environmental assessment from June 2026 and is not itself a license decision. (Federal Register / NRC)

2026-09-24 — The NRC proposes a wholesale rewrite of reactor licensing and oversight rules

• The Nuclear Regulatory Commission published an 89-page proposed rule revising how reactors are licensed, decommissioned and overseen, with comments due November 9. It is the NRC’s response to Executive Order 14300, “Ordering the Reform of the Nuclear Regulatory Commission,” which directs a wholesale revision of its regulations. The proposal touches decommissioning licensing, financial-qualification rules, risk-informed seismic design and probabilistic risk assessment, backfitting and issue-finality provisions, notification of initial fuel load, standard design approvals, early-site-permit environmental reviews, post-Three Mile Island requirements and operator licensing. It is a proposal only, so it changes no licence timelines yet. (Federal Register)

2026-09-22 — Palisades restart stalls after a fuel assembly tips during loading

• Holtec paused fuel loading at Michigan’s Palisades nuclear plant after one fuel assembly tilted out of position, stalling what would be the first restart of a decommissioned US reactor. Holtec said crews were lowering fuel into the core when an assembly ended up stuck in a tilted position after the handling machine released it; engineers must retrieve it and move it to the spent-fuel pool before the restart can go on. Holtec and the Nuclear Regulatory Commission both said there was no radiological release and no danger to workers or the public, and the NRC is investigating. The plant closed in 2022 and is being brought back partly on AI-driven power demand, so a delay pushes back the earliest restarted-reactor electrons this thread tracks. (ABC57, The National)

2026-09-21 — Google funds 96MW of Georgia nuclear uprates; Kairos gets a $100M Samsung C&T commitment

• Google agreed to fund uprates at Georgia Power’s Vogtle and Hatch nuclear plants that would add about 96MW of capacity, under a new subscription tariff that gives Google the plants’ zero-emission credits Georgia Power says the arrangement (the NU-1 tariff, filed 09-21 in Georgia PSC dockets 44280 and 56002 along with a request for a new extended power uprate at Hatch units 1 and 2) will bring about $900M in benefits to customers over the units’ lives and shields non-participating customers from the uprate cost; it needs Georgia Public Service Commission approval. The Vogtle units 1 and 2 uprate was already approved in the utility’s 2025 resource plan. (Georgia Power/PR Newswire, POWER)
• Kairos Power signed a binding term sheet under which Samsung C&T will provide up to $100M in investment and in-kind engineering to help deliver Hermes 2, the 50MW reactor in Oak Ridge, Tennessee that will supply Google through the Tennessee Valley Authority Samsung C&T also joins Kairos’s engineering-procurement-construction team, initially on power-generation systems and balance of plant; the deal is subject to regulatory approvals and builds on an 08-18 memorandum with Barnard Construction. The plant, one of the first Generation IV reactors planned in the US, is slated for completion by 2030. (Kairos Power, DCD)

2026-09-16 — Holtec pulls its $900M IPO, naming data-center backlash as the reason nuclear could not price

Logged 2026-09-20 on the cold rotation, four days after the event.

• Holtec International suspended its roughly $900 million US IPO, and its chief executive told the Financial Times the withdrawal was driven by investor sentiment against the AI data-center buildout rather than by anything about the nuclear business itself — “our business, rightly or wrongly, is viewed as connected to [data centers]… that was a big factor in market sentiment against nuclear.” Holtec supplies nuclear components and had earmarked proceeds to restart a mothballed Michigan plant and fund small-modular-reactor development, so the pulled listing delays capital for exactly the announced-but-unbuilt capacity this thread tracks. It is also the first instance on this record of the data-center backlash pricing a nuclear supplier out of the public market — the backlash reaching the financing of the power, not just the siting of the halls. (Bloomberg, World Nuclear News)

2026-09-08 — The Energy Department closes a $1.9bn loan restarting NextEra’s Duane Arnold reactor, with the output pre-committed to Google

• The Energy Department closed a loan of up to $1.9 billion to restart NextEra’s Duane Arnold nuclear plant in Iowa, alongside a new NextEra-Google collaboration tying the plant’s output directly to AI demand. A closed loan is a materially different fact from an announced one — this is money committed, not intent — and it is a rare instance of this thread’s own “announced-to-operational gap” watch line actually narrowing rather than widening. ⚠️ The plant’s capacity and restart-target year could not be confirmed from a 2026-dated source and are deliberately omitted rather than recalled from an earlier context. (DOE; PR Newswire; NextEra newsroom)

2026-08-28 — PJM dropped Oklo’s Meta-backed Ohio nuclear project from its interconnection queue, and the FERC dispute is still open

• PJM Interconnection removed a 750MW Oklo-led, Meta-backed project — 150MW advanced nuclear, 300MW fuel cells, 300MW natural gas, sited in Pike County, Ohio (one of the four awards under Meta’s up-to-6.6GW nuclear RFP, Oklo’s “1.2GW Aurora”) — from its interconnection study cycle, citing an unaddressed requirement to show the project could “ride through a sudden drop in grid voltage.” Oklo disputes the removal procedurally, saying PJM posted the deficiency finding via its NextGen portal on June 24 without a formal notice, denying it a chance to respond, and filed an emergency complaint with FERC on 08-28 asking for reinstatement at its original queue position — arguing the removal adds at least 14 months of delay and materially raises costs. As of this morning no FERC ruling has been reported; Oklo’s stock fell roughly 5-6% on the news. It is the first of Meta’s four nuclear awards to hit a hard interconnection obstacle, and the dispute is about queue procedure rather than the reactor’s licensing. (Utility Dive)

2026-07-30 → 08-17 — Three announcements, zero licences

Logged 2026-08-18, twenty-four days late — the coldest thread in the rotation. This thread’s test is which projects clear LICENSING.

• On the test: nothing moved. No new NRC construction or operating licence was granted to any AI-linked reactor project across the entire 07-25 → 08-18 window. Oklo’s NRC Principal Design Criteria approval (May 2026) and its DOE Reactor Pilot Program agreement (March 2026) both predate it. The thread’s core claim — ~0 net-new MW before 2027, every genuinely new SMR project 2030s-weighted — is unchanged and unchallenged.
• Crusoe and Aalo Atomics announced a “first nuclear-powered AI factory” (07-30) — Aalo’s 50MWe “Pod” (five 10MWe Aalo-1 microreactors) powering a Crusoe Spark modular AI datacenter, as a 2027 proof-of-concept at Idaho National Laboratory, with general deployment at Crusoe sites targeted by end-2029. A partnership and a demo, not a licence; Aalo’s test reactor reached criticality 2026-07-04. (Crusoe)
• X-Energy drew up to $1B more DOE funding for its Dow/Seadrift, Texas project (08-13), announced alongside Q2 earnings and bringing total federal backing to up to $2.15B. Funding escalation, not a licensing event. Centrus signed a uranium-enrichment supply contract with X-Energy (08-17) supporting Xe-100 and TRISO-X — supply-chain progress, same category.
• ⚠️ Trap caught: “Oklo stock jumps on $200M AI data center nuclear plan” (dated 08-10) is a re-index of a DOE programme announced 2026-07-21, before this window. Excluded.

2026-08-04 — A named hyperscaler retreats from a nuclear-adjacent site

• AWS formally withdrew its application for a ~500MW, 8-building data center campus on ~2,000 acres of Constellation Energy land next to the Calvert Cliffs nuclear plant in Lusby, MD — filed 2026-05-04, withdrawn 2026-08-04, no public reason given. Local reporting ties it to a contentious approval fight (a commissioner’s signed NDA, job postings that leaked pre-announcement, and the county moving toward new data-center zoning restrictions) rather than a stated power-supply failure. (Southern Maryland Chronicle)
• 💡 Directly on this thread’s “announced-to-operational gap” watch line — this isn’t a licensing failure like the thread’s usual SMR-timeline skepticism, but it’s the same underlying pattern: a nuclear-adjacent AI site that was announced and then didn’t happen, for reasons outside the nuclear technology itself.

2026-08-03 — A Nvidia-linked nuclear startup raises $1B to go from prototype to production

• Valar Atomics closed a $1B Series B led by Sequoia Capital at a $6B valuation, three years after founding — money earmarked to move from running a single test reactor in Utah to a production line building small reactors, following a development deal signed with Nvidia in June 2026. (TechCrunch)
• A second, smaller nuclear-for-AI data point the same week: Aalo Atomics (already on this thread’s radar via its 07-30 Crusoe tie-up) reported reaching criticality in its own test reactor — a real technical milestone, but still a prototype step, not new AI-serving capacity. ⚠ single-source (American Nuclear Society), not independently corroborated.

2026-07-27 — The nuclear book across the four

• Microsoft: TMI/Crane 2027 (DOE $1B, NRC draft + FERC cleared) · Amazon: Talen 1.92GW/17yr firm + X-Energy 5GW-by-2039 · Google: TVA/Kairos Gen-IV (2030) · Meta: RFP awards ≤6.6GW (Oklo/TerraPower/ Vistra) — but hedged with a 7.5GW gas pivot. Skeptical note: SMR timelines lag near-term demand (Bulletin, 07-20).

2026-07-25 — First federal dollar

• DOE tapped Oklo/X-Energy for a $200M nuclear-for-AI push; aggregate nuclear deals signed by AI companies now ≈ 7M homes of power (07-26 figure). The thread’s first real items since opening quiet.

2026-07-24 — Opened + crawled

• Thread opened.
• Verdict: power is the binding constraint, and nuclear is a real but 2030s-weighted marathon. Carnegie (06-2026) pegs the ~13GW of announced hyperscaler nuclear at <20% of projected datacenter demand through 2035; a single year of planned US solar (43GW) dwarfs the whole mid-2030s nuclear pipeline. The near-term “firm” adds are restarts/uprates that re-label existing MW, not new generation. ⚠ WebSearch budget exhausted (fan-out) — some 2026 items aggregator-only, flagged.

← Backstory (crawl 2026-07-24 → artifacts/findings/nuclear-for-ai-2026-07-24.md)

2026-06 — The reality check

• NRC issued a draft Environmental Assessment for the TMI-1/Crane restart (~835 MW, still in SAFSTOR, final finding ~Sept 2026) — the first firm power, targeted 2027. Same month, Carnegie’s “Beyond the Hype” quantified the announced-vs-real gap. (Carnegie)

2026-01 — Meta’s nuclear trifecta

• Meta signed three deals in one month — TerraPower (~2.8GW Natrium by ‘35), Oklo (1.2GW Aurora, Ohio, by ‘34), Vistra (~2.6GW existing-plant PPAs + uprates) — new-build plus fleet re-labeling. (Carnegie)

2024-2025 — The wave’s anchors

• Microsoft/Constellation to restart TMI-1 (09-2024, 20-yr PPA, ~835MW, now targeted 2027) · Amazon/X-energy ($700M, Xe-100 SMRs, first ~320MW ~2030) + Amazon/Talen 1.9GW existing-reactor PPA · Google/ Kairos (50→500MW by 2035, first US Gen-IV PPA). Every genuinely NEW build is a 2030-2039 SMR/Gen-IV project on designs not yet operating in the US. (World Nuclear News)