Fusion power has spent decades as the joke that is always a decade away. That joke is getting expensive to tell. Private investors have now poured billions into fusion startups, with at least 17 companies crossing the $100 million mark in committed capital, according to data shared with TechCrunch by FusionX.
The surge is driven by three advances: more powerful computer chips, more sophisticated AI, and high-temperature superconducting magnets. A 2022 U.S. Department of Energy lab experiment that crossed scientific breakeven added the proof that the underlying science works.
Commonwealth Fusion Systems leads the pack
Commonwealth Fusion Systems (CFS) has raised about a third of all private capital invested in fusion companies to date. A $1 billion round that closed in July took its total to $3.94 billion. The Massachusetts startup, co-founded by MIT-linked CEO Bob Mumgaard, is building Sparc, a tokamak expected to reach scientific breakeven in 2027. Its commercial plant Arc will produce 400 MW near Richmond, Virginia, with Google committed to buying half the output.
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Helion, TAE and the $1 billion club
Helion has the most aggressive timeline, planning to produce electricity by 2028 with Microsoft as its first customer. A June Series G of $465 million valued it at $15.5 billion, taking its total to $3.2 billion. Backers include Sam Altman, SoftBank, KKR and BlackRock.
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TAE Technologies, founded in 1998, raised $1.65 billion and is merging with Trump Media in a deal valuing the combined company at $6 billion. Pacific Fusion’s Series A topped $1 billion, led by scientist Eric Lander, who headed the Human Genome Project. Shine Technologies has also crossed $1 billion, selling neutron testing and medical isotopes while it works toward fusion.
The rest of the field
Proxima Fusion raised $682.9 million, Inertia Enterprises $450 million, General Fusion $442 million, and Zap Energy $325 million. Tokamak Energy has $284 million, Focused Energy $277 million plus $200 million in grants, and Marvel Fusion $208 million. Type One Energy ($174.5 million), First Light Fusion ($140 million), Kyoto Fusioneering ($121 million), Thea Energy ($120 million) and Xcimer ($101 million) round out the list.
Why it matters
Fusion promises to harness the reaction that powers the sun, generating near-limitless energy and upending trillion-dollar markets. The money is no longer speculative scraps – it is institutional-scale capital with power purchase agreements attached. If even one of these companies delivers, the energy industry changes forever. The bets are placed; now the reactors have to deliver.