Scan: When will nuclear fusion be achieved?

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When will nuclear fusion be achieved? — Before 2030

KXFUSION-30-JAN01 · Science and Technology · 2026-05-09

32%

Agent

32%

Market Price

+0.0%

Edge

35%

Confidence

Volume: 28,072

Spread: 0.1c

Days to resolution: 1332

Markets in event: 3

Final Rationale

My independent estimate of 36% rested heavily on sq4 (resolver interpretation of 'achieved'): NIF has demonstrated scientific ignition 10+ times since Dec 2022 including 8.6 MJ in April 2025, so a loose interpretation would have already resolved YES, while a strict wall-plug/engineering breakeven interpretation makes pre-2030 success unlikely (ITER first plasma 2033+, Helion's 2028 grid target highly speculative, TAE targeting 2031). I PARTIALLY ACCEPT the critique's point that my sq4 qualitative reasoning ('markets favor stricter interpretations') was inconsistent with a 45% point estimate — lowering sq4 to ~35% pulls the combined estimate down to ~0.32. I REJECT the OR-math correction because the scientific-ignition pathway is gated on resolver interpretation, which I now weight lower. The market at 32% with medium reliability converges with my adjusted estimate, so I anchor there.

Price vs. prediction

How the market moved after the agent's call. Solid blue line is the actual market price; dashed line is the agent's static forecast at $t{=}0$.

$n = 58$ follow-ups

Re-scan Context

This market has been scanned before. Previous predictions:

Date	Predicted	Market Price	Confidence
2026-05-02	40%	38%	42%
2026-04-06	42%	40%	45%

1. Planner Opus · Fermi decomposition + tool plan

Tools chosen: kalshi_data kalshi_orderbook article_search web_search wikipedia_lookup

Sub-questions (Fermi decomposition)

Has nuclear fusion already been 'achieved' (net energy gain / ignition) as of May 2026, or is there a credible claim that will be validated before 2030? (w=0.25)
Will any public or private fusion facility demonstrate net energy gain (Q>1 at the wall-plug or equivalent scientific breakeven) before January 1, 2030? (w=0.40)
Will private fusion companies (e.g., Commonwealth Fusion, TAE, Helion, NIF follow-ups) reach a milestone sufficient to trigger resolution before 2030? (w=0.20)
Is the resolution criteria for this market likely to be interpreted as scientific ignition (Q>1 fusion energy gain) rather than commercial viability? (w=0.15)

Planner reasoning

This question hinges on a precise definition of 'achieving nuclear fusion' — most likely interpreted as scientific net energy gain (fusion energy out > laser/driver energy in, i.e., Q>1 at some level). NIF demonstrated ignition (target gain >1) in December 2022, but this used ~300 MJ of wall-plug energy to deliver ~2 MJ to the target for ~3.15 MJ fusion output, so wall-plug Q<<1. The critical question is whether the resolution criteria mirrors NIF's 2022 milestone (already achieved in some sense) or requires a more stringent definition. If NIF's Dec 2022 result qualifies, this may already resolve YES. If wall-plug efficiency or commercial breakeven is required, the timeline extends well past 2030 for most roadmaps. Key reference classes: ITER is not scheduled for DT plasma until ~2035+; private companies like Commonwealth Fusion's SPARC target first plasma ~2025 and high-field experiments by late 2020s but net gain not before 2030 per their own timelines; Helion targets net electricity by 2028 (per Microsoft deal) but this is highly speculative. The temporal analysis: for YES to occur before 2030, either (a) NIF or a successor already meets the resolution criteria and a ruling is issued, (b) a private company achieves a dramatic unexpected breakthrough within 3.6 years, or (c) SPARC or similar achieves net gain ahead of schedule. The base rate for major physics breakthroughs on compressed timelines is very low. The main uncertainty is the resolution criteria ambiguity around NIF's 2022 result. Prediction market price will be key signal.

2. Research Parallel tool calls · legacy v2

Tool	Status	Time	Items
kalshi_data	OK	3.5s	-
kalshi_orderbook	OK	0.4s	-
article_search	OK	1.2s	-
web_search	OK	68.0s	-
wikipedia_lookup	OK	4.8s	-

3. Evidence Synthesis Sonnet · 14 items · legacy v2

#	Strength	Credibility	Direction	Source	Claim	Priced In
1	STRONG	90	↑ UP	web_search	NIF achieved scientific ignition (fusion energy > laser energy delivered to target) on December 5, 2022, with Q~1.5 at the target level, and has repeated this 9+ more times since, including an 8.6 MJ record on April 7, 2025 with target gain >4.	Yes
2	STRONG	85	NEUTRAL	wikipedia_lookup	As of 2025, NIF is the only facility to demonstrate fusion energy gain factor above 1, but wall-plug efficiencies are orders of magnitude too low for engineering or economic breakeven.	Yes
3	MODERATE	72	NEUTRAL	web_search	Helion Energy's 7th-generation Polaris prototype achieved a record plasma temperature of 150 million °C on February 13, 2026, and became the first private machine to use deuterium-tritium fuel, but has not demonstrated net energy gain.	Yes
4	MODERATE	70	NEUTRAL	web_search	Germany's Wendelstein 7-X stellarator raised energy turnover to 1.8 gigajoules in May 2025, a stellarator record, but this is a confinement metric, not a net energy gain result.	Yes
5	STRONG	90	↓ DOWN	wikipedia_lookup	NIF's target-level Q>1 does NOT constitute wall-plug net energy gain; ~300 MJ of electrical energy is required to deliver ~2 MJ of laser energy to the target, meaning wall-plug Q remains far below 1.	Yes
6	STRONG	92	↓ DOWN	wikipedia_lookup	ITER, the world's most advanced tokamak, is not expected to achieve first plasma until 2033–2034, placing any ITER-based Q>10 demonstration well after 2030.	Yes
7	MODERATE	75	NEUTRAL	web_search	Private investment in fusion reached $10.6 billion between 2021 and 2025, with the number of fusion companies more than doubling to 53, indicating a rapid ramp-up in activity but no confirmed net energy gain (wall-plug) by any private entity.	Yes
8	MODERATE	65	↓ DOWN	kalshi_data	Kalshi market 'Before 2030' is priced at 32%, with a -6.2% move in the last 7 days and -2.2% over 30 days, suggesting market participants are leaning toward NO but not with overwhelming conviction.	Yes
9	MODERATE	80	↓ DOWN	article_search	TAE Technologies merged with Trump Media in a $6 billion all-stock deal in December 2025, targeting its first fusion power plant online by 2031 — explicitly after the 2030 deadline.	Yes
10	MODERATE	68	NEUTRAL	web_search	Helion Energy targets delivering power to the grid in Washington State by 2028 per its Microsoft deal, but as of early 2026 it has only demonstrated plasma temperature milestones, not net energy gain.	Yes
11	WEAK	45	↓ DOWN	article_search	Commonwealth Fusion Systems (SPARC) is not mentioned in current news as having achieved or imminently approaching net energy gain; their roadmap targets high-field experiments in the late 2020s but net gain before 2030 is not confirmed.	Yes
12	STRONG	82	↑ UP	wikipedia_lookup	NIF's December 2022 achievement is described as 'scientific breakeven' (target gain Q>1), not wall-plug or engineering breakeven; the resolution criteria of this market likely mirrors NIF's scientific ignition definition given it is described as the first instance of 'fusion achieved'.	Yes
13	STRONG	85	↑ UP	web_search	NIF has now achieved scientific ignition (target gain Q>1) 10 times since December 2022, including an 8.6 MJ record in April 2025, which may already satisfy a 'scientific ignition' resolution criterion if so defined.	No
14	MODERATE	70	↓ DOWN	kalshi_data	The Kalshi market has not resolved YES despite NIF's repeated ignitions since 2022, suggesting the market (or its resolution criteria) requires something beyond NIF's current target-gain-Q>1 demonstrations.	Yes

Information Gaps

No clarity on the exact resolution criteria for this Kalshi market — whether it requires target-gain Q>1 (already achieved by NIF), wall-plug Q>1, or some other definition.
No data on Commonwealth Fusion Systems' SPARC progress as of early 2026 — whether their timeline remains on track for late 2020s experiments.
No information on whether Kalshi has issued any resolution guidance or FAQ addressing NIF's December 2022 ignition result and subsequent experiments.
No data on NIF's roadmap for further efficiency improvements or path toward higher wall-plug Q.
No information on Chinese or other national fusion programs (e.g., EAST tokamak) that could achieve a qualifying milestone before 2030.
Helion's actual engineering progress toward Q>1 at any level is unclear — temperature milestones do not confirm energy balance.
TAE Technologies' actual technical milestones (beyond commercial announcements) are not documented in this evidence set.

Key Uncertainties

Resolution criteria ambiguity: If the market resolves on NIF-style scientific ignition (target Q>1), it may already be resolvable YES based on events since December 2022. If wall-plug or engineering breakeven is required, NO is near-certain before 2030.
Whether the Kalshi market operators will retroactively resolve YES based on NIF's multiple ignition events, or require a new, more stringent milestone.
Helion Energy's 2028 commercial power delivery target is highly speculative and faces enormous technical hurdles; unexpected breakthroughs are possible but unpredictable.
Potential for a dramatic, unexpected private-sector breakthrough (e.g., SPARC achieving net gain ahead of schedule) — low probability but non-negligible given the pace of investment.
Political factors: Trump administration regulatory changes and Trump Media/TAE merger could accelerate or complicate the US fusion program timeline.
The -6.2% Kalshi price drop in 7 days may reflect new information (e.g., a failed milestone, updated company guidance) not captured in this evidence set.

Market Context

Price: 0.32 · 7d: -0.062 · 30d: -0.022
Volume: LOW-MODERATE — 208 average daily contracts is modest, suggesting limited liquidity but some active trading · Depth: HIGH — depth of 1,050,329 suggests large passive orders, but bid/ask spread of $0.9980 indicates the orderbook data may be unreliable or reflects a wide spread
Reliability: MEDIUM — moderate volume with concerning orderbook spread data; price trend is informative but market may be thinly traded

4. Independent Forecaster Opus · No market price · legacy v2 Did NOT see market price

Independent estimate: 36% (40% confidence)

base rate

33%

40% conf

evidence driven

38%

40% conf

contrarian

38%

40% conf

Spread

5pp

Low disagreement

sq1: Has nuclear fusion already been 'achieved' as of May 2026, or is there a credible claim that will be validated before 2030?

55%

NIF achieved scientific ignition (target Q>1) on Dec 5, 2022, and has repeated it 10+ times including 8.6 MJ in April 2025. Under a 'scientific ignition' interpretation, fusion has been achieved. However, market framing 'When will nuclear fusion be achieved' suggests a future event, implying a stricter standard. Base rate for ambiguous resolution markets favoring YES interpretation is ~50%. The strong factual basis (NIF's repeated successes are widely reported as 'achieving fusion') pushes up to ~55%.

sq2: Will any facility demonstrate net energy gain (wall-plug Q>1) before Jan 1, 2030?

Base rate for major physics/engineering breakthroughs hitting compressed timelines: ~10-15%. ITER won't achieve first plasma until 2033-2034. NIF wall-plug Q is ~0.01, requires 100x improvement. Helion's 2028 target is aggressive and unproven — their Polaris machine hit temperature milestones but no Q>1. SPARC targets high-field experiments late 2020s, not net gain. Strong evidence pushes DOWN: no current facility is on a credible path to wall-plug Q>1 by 2030. Estimate: 8%.

sq3: Will private fusion companies reach a resolving milestone before 2030?

12%

TAE explicitly targets 2031 (after deadline). Helion's 2028 grid power target is highly speculative and 99% of similar aggressive private-sector tech timelines slip. CFS/SPARC roadmap doesn't claim net gain before 2030. Base rate for private fusion companies hitting their own aggressive timelines is ~10-15%. With $10.6B invested and 53 companies, surprise possible but specific Q>1 milestones unlikely. Estimate: 12%.

sq4: Will resolution criteria be interpreted as scientific ignition rather than commercial viability?

45%

If interpreted as NIF-style scientific ignition (target Q>1), already achieved. Question phrasing 'When will fusion be achieved' suggests resolvers want a future-recognizable event. Markets like this tend to favor stricter interpretations to avoid retroactive resolution disputes. The fact that this market is still trading actively (rather than resolved YES) strongly suggests resolvers don't view NIF 2022 as sufficient. This pushes DOWN. Counter: many news sources do call NIF's result 'achieving fusion.' Estimate: 45%.

Show full reasoning trace

base rate: Major fusion milestones on compressed timelines historically slip 50-100%. Base rate for 'achieving fusion' under strict (wall-plug) definition before 2030: ~5-10%. Under loose (scientific ignition) definition: already achieved. The key question is which definition resolvers use.

evidence updates: NIF's repeated ignitions (10+ times, 8.6 MJ in April 2025) push UP if scientific definition applies. ITER's 2033+ timeline pushes DOWN substantially. Private companies' commercial timelines (TAE 2031, Helion 2028 speculative) are mostly post-2030 or unreliable. The fact this market hasn't already resolved YES despite NIF's 2022 ignition strongly suggests the bar is higher than scientific ignition.

combination method: Treated as OR-aggregation across pathways: (a) resolver accepts existing NIF results (~30%), (b) new qualifying breakthrough by 2030 (~12%). Combined: ~0.40, adjusted downward to 0.33 because the market's continued non-resolution since 2022 is strong evidence against pathway (a).

final: Final estimate 33%. The dominant uncertainty is resolution criteria — if NIF's existing achievements counted, this would have resolved YES already. The market's continued trading suggests stricter criteria, under which YES requires a wall-plug or engineering breakeven that no facility is on track to achieve by 2030. Confidence is moderate-low (0.4) due to definitional ambiguity.

ensemble: {'ensemble_count': 3, 'perspectives': {'base_rate': {'p_yes': 0.33, 'confidence': 0.4}, 'evidence_driven': {'p_yes': 0.38, 'confidence': 0.4}, 'contrarian': {'p_yes': 0.38, 'confidence': 0.4}}, 'spread': 0.05, 'individual_p_yes': {'base_rate': 0.33, 'evidence_driven': 0.38, 'contrarian': 0.38}}

5. Devil's Advocate Sonnet · legacy v2 Market price revealed

Math Error Missing Info Reasoning Flaw

Challenges

The combination math is questionable. You estimate sq4 (resolver accepts scientific ignition interpretation) at 45%, and sq1 conditional on that is essentially 100% (NIF already did it 10+ times). That pathway alone is ~45%, not 30% as stated in the combination. Then OR-aggregating with ~12% for a new qualifying breakthrough yields ~52%, not 0.40. The downward adjustment to 0.33 based on 'market hasn't resolved YES' may be double-counting: the market's non-resolution is already baked into your sq4 estimate of 45%.
Conversely, you may be overweighting 'market hasn't resolved YES since 2022' as evidence. Many Kalshi/Polymarket questions about future-dated events don't resolve early even when the underlying condition is met — resolution typically happens at close time. The market trading at 32% rather than 90%+ is stronger evidence than non-resolution itself, but you're using both, potentially double-counting.
The sq4 reasoning contains a subtle inconsistency: you say 'markets like this tend to favor stricter interpretations' (pushing DOWN) but then set p=45%, which is roughly neutral. If you genuinely believe stricter interpretation is favored, sq4 should be lower (e.g., 25-35%), which would actually pull the final forecast DOWN toward the market price.
Information gap on actual resolution criteria is critical and should widen uncertainty bands. With 1332 days to resolution and definitional ambiguity as the dominant driver, confidence of 0.4 may be appropriate but the point estimate is highly sensitive to a binary interpretation question you have no direct evidence on.

Suggested adjustment: -4pp

Two reasoning issues roughly cancel but net slightly downward: (1) the OR-aggregation appears to undercount the scientific-ignition pathway, which would push UP, but (2) sq4's qualitative reasoning ('markets favor stricter interpretations') is inconsistent with its 45% point estimate, and the downward adjustment from 0.40 to 0.33 may double-count the non-resolution signal. A modest downward adjustment to ~0.32 better reflects the resolution-criteria uncertainty. This is not about market conformity — it's about internal consistency.

Market comparison: Forecaster: 36.3%, Market: 32.0%. The 4.3pp divergence is small and well within reasonable disagreement given definitional ambiguity. Market liquidity is questionable (wide spread, modest volume), so the market signal is weak. The divergence does not require adjustment on market-conformity grounds, but minor internal reasoning issues suggest a slight downward revision is warranted.

6. Aggregator Opus · final calibrated forecast

32% (35% confidence)