Fusion sector capital hits $7.1bn as sixteen startups clear $100m hurdle

Fusion startups have collectively raised $7.1 billion in private capital to date, according to data provided to TechCrunch by FusionX. The majority of this funding is concentrated among a small number of companies, with sixteen startups having each secured over $100 million in committed capital. This financial influx reflects a shift in investor sentiment, moving the technology from theoretical challenges to tangible development stages.

Commonwealth Fusion Systems leads the sector, having raised approximately a third of all private capital invested in fusion companies. The Massachusetts-based firm recently closed a $1 billion round in July, bringing its total funding to $3.94 billion. It is currently constructing Sparc, a tokamak reactor intended to reach scientific breakeven in 2027, with plans for a commercial plant in Virginia later this decade.

Helion Energy follows with $3.2 billion in committed capital, valued at $15.5 billion after its latest Series G. Based in Washington state, Helion utilises a field-reversed configuration reactor and has secured Microsoft as its first customer, targeting electricity production by 2028. Its investor list includes BlackRock, SoftBank Vision Fund 2, and Sam Altman.

Pacific Fusion entered the market with a Series A exceeding $1 billion, the largest initial round among the group. Led by Eric Lander, the company employs inertial confinement using electromagnetic pulses rather than lasers. Funding is structured in tranches tied to milestones, a model common in biotech. TAE Technologies, which utilises a similar field-reversed configuration enhanced by particle beams, has raised $1.65 billion and recently announced a merger with Trump Media & Technology Group.

Other significant players include Proxima Fusion, which raised over $682.9 million for its stellarator design, and Shine Technologies, which has secured $1 billion to focus on neutron testing and medical isotopes before pursuing power generation. Inertia Enterprises emerged from stealth with $450 million in Series A funding, leveraging technology from the National Ignition Facility.

General Fusion, based in British Columbia, has raised over $442 million for its magnetised target fusion approach. The company recently listed on the Nasdaq via a reverse merger, netting $127 million, following a period of financial strain that included staff layoffs and emergency funding rounds.

Zap Energy has raised $325 million and announced a pivot to include nuclear fission and hybrid power plants to generate earlier revenue. Tokamak Energy, based in the UK, has secured $284 million for its compact spherical tokamak design and will supply magnets for the UK’s STEP Fusion program.

Focused Energy, tracing its lineage to the National Ignition Facility, has raised $277 million to develop mass-manufacturable fuel targets. Marvel Fusion, based in Munich, has secured $208 million for an inertial confinement approach using silicon nanostructures, with a demonstration facility expected by 2027.

Type One Energy has raised $174.5 million for a stellarator reactor planned for a former coal plant site in Tennessee, aiming for the mid-2030s. Kyoto Fusioneering has attracted $121 million to develop balance of plant components, anticipating supply chain needs for successful fusion operators.

First Light Fusion, based in Oxfordshire, has raised $140 million for an inertial confinement approach that uses projectiles rather than magnets or lasers. Thea Energy has secured $120 million for pixel-inspired magnets in its stellarator design. Finally, Xcimer, a Colorado-based firm, has raised $101 million to build a high-power laser system for inertial confinement, having recently activated its prototype Phoenix system.