Which nuclear power companies will achieve criticality before Aug 2026

30-day trend

Analysis

This contract estimates a 77% probability that at least one nuclear power company will achieve criticality—the point at which a nuclear reactor sustains a self-sustaining chain reaction—by August 2026. Criticality represents a major developmental milestone, typically preceding full commercial operation by months. The high probability reflects recent progress in advanced reactor projects, particularly small modular reactors (SMRs) and next-generation designs under active construction. However, nuclear projects historically face regulatory delays, engineering challenges, and schedule slips. The main factors supporting this outcome are publicly announced construction timelines and regulatory approvals already granted; downside risk comes from technical issues or permitting complications. The contract resolves definitively in August 2026 when companies either announce criticality achievement or the deadline passes.

• ›At least one company (TerraPower, X-energy, NuScale, or equivalent player) must publicly announce achieving criticality with a reactor; this is a verifiable, announced event
• ›Current construction timelines for leading SMR projects show multiple facilities in final assembly phases as of mid-2026, creating a factual basis for the 77% assessment
• ›Regulatory approval status for specific reactors in the U.S. and other jurisdictions directly determines feasibility—this is documented and trackable
• ›Historical nuclear project delays of 6-24 months are common; any engineering setback or inspection finding in the next 3 months materially changes resolution odds
• ›The distinction between 'criticality' and 'full operation' is precise: criticality alone does not require full licensing completion, making August 2026 achievable if construction stays on schedule

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How we compute these odds