Fusion power has crossed from punchline to pipeline, and the money proves it. A new TechCrunch census of every fusion startup that has raised over $100M shows Commonwealth Fusion Systems alone has banked $3.94B, roughly a third of all private capital that has flowed into the sector.
The wave is powered by three advances: faster chips, better AI, and high-temperature superconducting magnets. Add the 2022 National Ignition Facility experiment that produced more energy than it consumed, and founders suddenly had a story investors could model.
Commonwealth leads the pack. Its Sparc tokamak, wound with superconducting tape, is expected to switch on in late 2026 or early 2027, followed later this decade by Arc, a 400-megawatt commercial plant. Backers include Breakthrough Energy Ventures and Bill Gates. Helion runs the most aggressive timeline, promising electricity in 2028 with Microsoft as its first customer. The Everett, Washington company raised $465M in June at a $15.5B valuation, bringing its total committed capital to $3.2B.
TAE Technologies, spun out of UC Irvine in 1998, is the veteran of the group, still refining its field-reversed configuration approach. The census data, compiled by FusionX, underscores how concentrated the sector is: a handful of companies hold most of the capital, and each one is betting on a different reactor geometry.
For startup watchers, the takeaway is simple. Fusion is no longer a science project funded by philanthropists, it is a venture asset class with real deadlines, real customers, and a widening gap between the leaders and everyone else.
