Will fusion power get cheap? Don’t count on it.

2026-04-23 · Source: MIT Technology Review · Field: Energy & Utilities — Nuclear Energy & Advanced Technologies, Energy Markets & Policy, Emerging Energy Technologies · Depth: Intermediate, short

Summary

A new study published in *Nature Energy* estimates the future cost trajectory of fusion power, suggesting it may not become cheap as quickly as other renewable energy technologies. Researchers from ETH Zurich predicted fusion's "experience rate"—the percentage by which cost declines with each doubling of capacity—to be between 2% and 8%. This rate is slower than solar (23%) and lithium-ion batteries (20%), but faster than fission (2%). The study, which focused on magnetic confinement and laser inertial confinement fusion, based its estimate on expert evaluations of fusion plants' unit size, design complexity, and customization needs. Experts largely agreed fusion is highly complex, will be large, and require more customization than solar but less than fission. This implies that significant deployment and time will be needed for fusion electricity prices to drop, potentially making it expensive for an extended period, contrasting with current modeling assumptions of 8% to 20% experience rates.

Key takeaway

For policymakers and investors weighing future energy portfolio allocations, this study suggests that fusion power's high complexity and slower predicted cost reduction (2-8% experience rate) warrant a re-evaluation of current investment levels. Your expectations for fusion's near-term economic competitiveness should be tempered, as significant deployment and time will be required for prices to drop, potentially making it a more expensive decarbonization option than commonly assumed.

Key insights

Fusion power's cost reduction rate may be slower than anticipated, impacting its economic viability.

Principles

• Technology cost declines at varying rates.
• Complexity correlates with lower experience rates.
• Unit size influences cost reduction speed.

Method

Researchers estimated fusion's experience rate by having experts evaluate plant characteristics (unit size, design complexity, customization) for magnetic and laser inertial confinement approaches.

In practice

• Analyze technology experience rates for investment.
• Consider complexity in cost projections.
• Evaluate customization needs for new tech.

Topics

• Fusion Energy Economics
• Experience Rate Metric
• Magnetic Confinement Fusion
• Laser Inertial Confinement
• Fusion Investment

Best for: Investor, Policy Maker, Tech Journalist

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Editorial summary, takeaway, and curation by AIssential. Original article published by MIT Technology Review.