When will nuclear fusion be achieved
Leader sits at 57% across 3 bound outcomes, runner-up at 46%. This is a winner-take-all market — the headline is the leader’s price, not an arithmetic mean.
Leader probability
Before 2040
Outcomes
3
winner-take-all
Runner-up
46¢
Before 2035
Spread
11pp
contested
24h volume
$21
thin orderbook
Closes
Jan 1, 2040
4880 days
Venue
Kalshi
3 bound
30-day trend
Bracket family
How the bracket ladder is priced.
Each row is one outcome on the venue. Sorted by 24h volume — the heaviest book is at the top.
Cluster 1
When will nuclear fusion be achieved
Analysis
Markets currently assign a 49% probability that nuclear fusion will achieve net energy gain before 2040, with greater skepticism about nearer timelines (44% by 2035, 30% by 2030). This reflects genuine technical progress—recent demonstrations like NIF's repeated ignition and private funding growth—alongside persistent engineering challenges in scaling, materials durability, and commercial viability. The probability sits between optimism about recent breakthroughs and caution about the gap between laboratory results and grid-scale deployment. Key uncertainties include whether experimental success translates to economically viable power generation, how quickly government and private funding sustains momentum, and whether material science can solve reactor wall degradation. Major catalysts ahead include Commonwealth Fusion Systems' SPARC timeline, China's EAST reactor milestones, and any announced private company commercialization targets.
- ›NIF achieved net energy gain in late 2022 and has since repeated ignition multiple times, establishing scientific feasibility rather than merely theoretical possibility
- ›CFS, TAE, and Helion have secured multi-billion dollar funding and published specific commercialization timelines (most within 2025-2035 window), creating concrete near-term test cases
- ›Engineering barriers remain unresolved: tritium breeding, neutron-resistant materials, and sustained operation at industrial scale have no proven solutions yet
- ›Regulatory and grid-integration pathways for fusion plants are largely undefined, introducing uncertainty independent of technical achievement
- ›The 14-year median forecast (2040) allows time for multiple prototype demonstrations but creates tension between laboratory success and commercial deployment readiness
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These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.
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How we compute these odds
SimpleFunctions aggregates live prediction-market contracts from Kalshi and Polymarket. Each slug groups contracts that resolve on the same underlying event, identified by venue event_id.
For binary slugs, the headline probability is the liquidity-weighted mid-price across all bound contracts. For multi-outcome slugs (e.g. elections with 3+ candidates), the headline is the leader’s price; we never arithmetically average disjoint outcomes — that would produce a number with no real-world meaning.
Snapshots refresh every 5 minutes during market hours; daily aggregates are computed at 04:00 UTC. The 30-day sparkline is drawn from per-ticker daily means stored in market_indicator_daily; 24h delta and movement events are derived from the same source.
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