Will Helion announce that it has produced electricity from fusion before 30 June 2027?
deadline 2027-06-30
confidence medium
tier 4 evidence
33%Asturna estimate
Resolution criterion
Yes if Helion publicly announces that it has converted fusion energy into measured electricity on Polaris or a successor, regardless of the net balance.
Verified starting state
In February 2026, Helion announced new temperature records on Polaris. On 8 September 2026, the company withdrew its "net electricity" predictions and recast Polaris's objective as a demonstration of electricity from fusion, with an executive stating that 50 MW would by no means be fully operational in 2028.
What pushes it up
- The resolution criterion requires only measured gross electricity from fusion regardless of net energy balance, matching Polaris's newly recast objective [tier 1]
- Polaris is already built and operating, having demonstrated temperature milestones in February 2026 [tier 1]
What pushes it down
- The remaining window before 30 June 2027 is only about 8.5 months, leaving minimal margin for typical pulsed-power hardware delays
- Helion walking back net electricity predictions and admitting delays for its 50 MW goal in September 2026 points to ongoing technical challenges that likely push experimental milestones out [tier 1]
What would move this number most
Whether Helion's pulsed inductive recovery diagnostics can cleanly isolate and verify fusion-derived electrical output on Polaris within the next 8 months
How this number is built
| Deadline | 2027-06-30 |
| Base rate | 25% |
| Best evidence | tier 4 · 0 article(s) used |
| Independent runs | 32 · 33 (spread 1 pts) |
| Confidence | medium |
| Evidence cap | not triggered |
| Last revised | 2026-10-10 12:45 |
| Model | gemini-3.8-flash |
Probability history
2026-10-10 12:45 33% 0 article(s) on file · gemini-3.8-flash
- What pushes it up. The resolution criterion requires only measured gross electricity from fusion regardless of net energy balance, matching Polaris's newly recast objective [tier 1]
- What pushes it up. Polaris is already built and operating, having demonstrated temperature milestones in February 2026 [tier 1]
- What pushes it down. The remaining window before 30 June 2027 is only about 8.5 months, leaving minimal margin for typical pulsed-power hardware delays
- What pushes it down. Helion walking back net electricity predictions and admitting delays for its 50 MW goal in September 2026 points to ongoing technical challenges that likely push experimental milestones out [tier 1]
- What would move this number most. Whether Helion's pulsed inductive recovery diagnostics can cleanly isolate and verify fusion-derived electrical output on Polaris within the next 8 months
2026-10-07 09:18 8% 0 article(s) on file · openai/gpt-oss-20b (Groq)
- What pushes it up. Helion has set a demonstration objective for electricity from fusion and has shown temperature progress, indicating a potential early announcement [1]
- What pushes it down. Helion withdrew net electricity predictions and has no evidence of actual electricity production; typical fusion timelines suggest a later date, making a 2027 announcement unlikely [1]
- What would move this number most. Whether Helion can achieve and demonstrate electricity production before mid‑2027
2026-09-22 00:36 23% 0 article(s) on file · gemini-3-flash-preview
Reasons not recorded for this revision (detailed history has only been kept since recently).