Why the Fusion Power Industry Must Embrace Smaller Scale

The fusion power industry is increasingly shifting toward compact designs as startups challenge the long-standing assumption that bigger reactors equal faster breakthroughs. Avalanche co-founder and CEO Robin Langtry argues that smaller-scale fusion systems enable faster learning cycles and quicker iteration than massive tokamaks or laser-based facilities.

Fusion energy seeks to replicate reactions occurring in the sun by heating and compressing plasma until atomic nuclei fuse and release energy . Achieving these conditions requires extreme temperatures, precise engineering, and advanced materials, which often drive projects toward massive, costly infrastructure.

Large-scale systems slow experimentation because even small design changes require extensive downtime and high capital expenditure. Smaller fusion devices reduce these constraints, enabling faster testing and refinement.

Avalanche uses high-voltage electric currents to accelerate plasma particles into orbit around an electrode, supported by relatively modest magnetic fields rather than massive superconducting magnets. As particles accelerate, collisions trigger fusion reactions, offering a distinct contrast to tokamak or laser-compression methods.

This compact setup allows Avalanche to test changes as often as twice per week, a pace considered impractical for large-scale reactors .

Investor interest reflects confidence in this smaller-scale strategy. Avalanche recently raised $29 million in a funding round led by R.A. Capital Management, bringing total funding to $80 million . Compared to competitors that have raised hundreds of millions or billions, this leaner capital structure supports rapid iteration without excessive financial risk .

Langtry draws parallels between Avalanche’s development model and the rapid-iteration culture in commercial space companies like Blue Origin, where smaller prototypes accelerate problem-solving. This approach prioritizes learning speed over immediate scale, a philosophy increasingly common across advanced technology sectors .

Current Avalanche reactors measure just 9 centimeters in diameter, with plans for a 25-centimeter system capable of generating roughly 1 megawatt . Increased size improves plasma confinement time, a critical factor for achieving a power ratio above 1, meaning more energy is produced than consumed .

Testing will occur at Avalanche’s FusionWERX facility, which is expected to obtain licensing to handle tritium by 2027, aligning with common fusion-fuel strategies for grid-scale power.

Progress in fusion power increasingly depends on balancing scale with speed. Smaller systems may not deliver grid power immediately, but they can shorten development timelines and reduce technical uncertainty . Expectations of major breakthroughs between 2027 and 2029 reflect growing optimism that diverse approaches will accelerate commercialization across the fusion sector .