Original Coverage & Source Attribution: en.wowtale.net
Fusion reactors mostly come in two flavors: tokamaks and stellarators. A tokamak drives a current through its donut-shaped plasma to help generate the confining magnetic field — a simpler design, but that current is also the main source of plasma instability. A stellarator shapes the entire magnetic field using intricately twisted 3D coils alone, which in principle allows steady-state operation without the current-driven instabilities, at the cost of far harder magnet engineering. Germany’s Wendelstein 7-X stellarator set a world record last year with a 43-second continuous plasma run, lending weight to the stellarator camp’s argument that “physics is no longer the problem — engineering is.” Money is following that thesis across the fusion industry broadly: the Fusion Industry Association says the sector raised $4.48 billion in the year through July 2026, up 69% year-over-year and a record high.
Riding that wave, Type One Energy said it has completed a $200 million Series B financing round. The round was co-led by Breakthrough Energy Ventures and Clutterbuck Capital, with Lowercarbon Capital, Siemens Energy Ventures, and SiteGround Capital joining as new investors.
Building Commercial Plants in Tennessee and the UK at the Same Time
Type One Energy is pursuing stellarator-based commercial fusion power plants under what it calls Project Infinity. It plans to build an engineering prototype, Infinity One, at the Tennessee Valley Authority’s Bull Run site, followed by Infinity Two — a 400 MWe plant the company bills as the world’s first commercial fusion power plant. The new funding supports both the company’s in-house FusionDirect technology program and execution of Project Infinity.
Type One Energy recently received what it describes as the first fusion-plant-specific operating license issued by the State of Tennessee. It’s worth noting this is a radioactive-materials handling license issued under a newly established state regulatory framework, not an NRC-level construction or operating permit — it clears the way toward breaking ground at Bull Run rather than authorizing full construction. Outside the US, the company is also pursuing a second commercial project through the UK Infinity Fusion Consortium, alongside Tokamak Energy, AECOM, Sheffield Forgemasters, and Barclays.
What Type One Energy emphasizes most isn’t the technology itself but its business model. Rather than building every plant from scratch on its own, it pulls in manufacturing, engineering, and operational capability from established energy-industry partners, which it says lets it run multiple plant projects in parallel. Siemens Energy Ventures’ participation in this round, the company says, reflects exactly that kind of industrial partnership.
A General Fusion Alum, This Time With a Stellarator
CEO Christofer Mowry has spent his career moving between nuclear energy ventures. He ran Babcock & Wilcox’s nuclear division before founding Generation mPower, a B&W-Bechtel joint venture aimed at commercializing small modular reactors, in 2011 — a project that folded when Bechtel exited in 2017. That same year he became CEO of General Fusion, a Canadian magnetized-target-fusion company, before founding Type One Energy in 2023. He has also served as chairman of the Fusion Industry Association.
Mowry said: “The breadth and quality of investors in this funding round demonstrates growing support for our strategy to industrialize the commercial deployment of fusion energy. The Series B financing enables us to remain focused on advancing our stellarator technology and Project Infinity design activities, while working with experienced industrial partners to deliver the first commercial fusion power plant at TVA’s Bull Run site.”
Breakthrough Energy Ventures’ Carmichael Roberts said: “Fusion is approaching the point where deployment, not discovery, defines the challenge. Type One Energy brings together the necessary business and technical leadership, optimized stellarator technology and industrial relationships that will help move fusion from breakthrough science to commercial power plants.” Siemens Energy Ventures partner Enrique Gonzalez Zanetich added that “Type One Energy’s pragmatic, execution-focused approach, strong industry and research network, and experienced and knowledgeable team provide a strong foundation for turning scientific progress into a commercially viable energy solution.”
Type One Energy was founded in 2019 and became venture-backed in 2023 with a $29 million seed round, followed by an $82.4 million seed extension in 2024. A $87 million convertible note in January of this year pushed total funding past $160 million; with this $200 million Series B now closed, cumulative funding has passed $400 million.
Competitors: Other Stellarators, and Rival Approaches to Fusion
Type One Energy’s closest stellarator rivals are Europe’s Proxima Fusion and the US’s Thea Energy, both of which have closed large rounds recently — though neither has a comparable model of co-developing a plant with a specific utility at an actual site.
The fusion industry’s best-funded company remains tokamak developer Commonwealth Fusion Systems, which raised another $1 billion in July alone, pushing total funding to $4 billion. Other approaches are drawing serious money too: field-reversed-configuration developer Helion Energy, which has a power purchase agreement with Microsoft, crossed a $15.5 billion valuation this year, while TAE Technologies has kept raising from backers like Google and Chevron. The UK’s Tokamak Energy, which builds compact high-field tokamaks, occupies an unusual dual role as both a rival and a partner — it’s a member of Type One’s UK consortium.
General Fusion, the company Mowry previously led, went through a major restructuring crisis last year before going public on Nasdaq via a SPAC merger as it looks to rebuild. Amid rivals pursuing different reactor designs, different business models, and different fortunes, Type One Energy is leaning hardest on “build it with a utility” as its defining edge.
