The round, announced Tuesday, was led by repeat investor Breakthrough Energy Ventures and Clutterbuck Capital, with participation from Lowercarbon Capital, Siemens Energy Ventures and SiteGround Capital. The funding lifts Type One up the ranks of the best-funded fusion companies, a field where even large raises can be consumed by the cost of cutting-edge plasma physics, materials science and advanced computation.
Type One chief executive Christofer Mowry said the Series B should get the company halfway to paying for a 400-megawatt commercial power plant, and that Type One could complete its first plant with less capital than many competitors even after raising more money. The key, he said, is the business model: Type One designs the plant and many of its components, then relies on a 'bespoke' network of suppliers chosen for the project to build them.
"The amount of capital that we need to raise to commercialize fusion at Type One is just a different order of magnitude than if you were going to be vertically integrated," Mowry said, referring to companies that make most of their own parts in-house. "Why would I want to spend on bricks and mortar? I used to run a big nuclear manufacturing company. That's expensive."
Type One will build its first two fusion devices at the Tennessee Valley Authority's Bull Run site, and infrastructure consultant AECOM is working on engineering for Infinity Two, the initial commercial power plant. Competitor Commonwealth Fusion Systems has licensed its high-temperature superconducting magnet technology to Type One, and the technology will help form the backbone of Type One's reactor design.
By relying on outside suppliers, Type One becomes what is known as an integrator, assembling a product from parts made by others. The approach minimizes the company's own manufacturing risk but reduces control over its supply chain. "They have 10,000 people, most of them are engineers of one kind. We're never going to have 10,000 people," Mowry said of AECOM.
The most prominent recent example of integration risk is Boeing, which relied on supplier Spirit AeroSystems for fuselage sections on the 737 and 787 before buying the company after a series of quality-control failures, including a door plug blowout on an Alaska Airlines flight in 2024.
"These business models are successful because they let companies focus on managing risk and developing a high level of competency in their slice of the value chain," Mowry said.