Which nuclear power companies will achieve criticality before Aug 2026? [Subquestion: Oklo]

probability: 13%

rationale:

My assessment places the probability of Oklo achieving criticality before August 1, 2026, at 13%, which is meaningfully below the public market price of 29%. This estimate is grounded in the fundamentals of Oklo's direct projects, tempered by the attribution risk regarding its subsidiary.

The central driver for Oklo's direct progress is the Aurora-INL powerhouse, a 75-MWe fast reactor at Idaho National Lab. The timeline for Aurora to reach criticality by August is functionally implausible. On June 11-12, 2026, the Department of Energy approved only the Preliminary Documented Safety Analysis (PDSA) for the facility 44 sources. Aurora still requires an approved full Documented Safety Analysis (DSA), a readiness review, and startup authorization before fuel loading can begin [11c73]. For scale, a much smaller 500 kW test unit recently took roughly five months to progress from PDSA to criticality 2 sources. Aurora-INL would need to clear these complex regulatory hurdles and operational readiness checks in just seven weeks. Notably, Oklo's own communications omit a near-term deadline for Aurora ans.org, and SEC filings target 2027 or 2028 for deployment and operation 2 sources.

The remaining probability mass stems primarily from structural ambiguity regarding Oklo's wholly-owned subsidiary, Atomic Alchemy oklo.com. Atomic Alchemy's 'Groves' reactor is further along the regulatory pathway and has specifically targeted a July 4 criticality 3 sources. Although Atomic Alchemy is listed as a distinct, separate entity in the underlying resolution framework—strongly implying that a Groves milestone should not trigger an Oklo resolution kalshi.com—there remains a non-trivial attribution risk. A criticality event at Groves could easily generate 'Oklo achieves criticality' headlines across accepted resolution sources, potentially triggering a positive resolution due to broad wording. Furthermore, there is a minor tail risk involving the 'Pluto' project, a LANL fast-spectrum plutonium criticality experiment oklo.com, though it has historically not been treated similarly to official DOE pilot program announcements energy.gov.

Ultimately, combining the near-zero fundamental chance for an Aurora-INL criticality with the moderate headline attribution risk surrounding Atomic Alchemy yields a 13% probability.