American fusion machine developer, Type One Energy, recently announced an $87 million Pre-Series B funding round, which now brings Type One Energy’s total investment to over $160 million.
This funding round came in the form of a convertible note. Type One is in the process of raising a $250 million Series B at a $900 million pre-money valuation.
Type One has previously raised a $29 million seed round and an $82.5 million seed extension. Investors of these previous have included Bill Gates’ Energy Breakthrough Ventures, Doral Energy-Tech Ventures, and TDK Ventures.
Type One Energy is pursuing a stellarator concept. They are currently working on Infinity One, which was announced in February 2024. The stellarator testbed is being constructed at a former Bull Run Fossil Plant in Clinton, Tennessee. This project is a cooperative effort involving Type One Energy, Tennessee Valley Authority, and Oak Ridge National Laboratory.
Infinity One Design Mockup, Source: Type One Energy
Infinity One is Type One’s proof of fusion power plant (FPP) concept, while Infinity Two is their actual powerplant design, which aims to come online in the 2030’s.
The goals of Infinity One are to demonstrate the efficiency of Type One’s modular HTS magnet system for stellarators, evaluate stellarator plasma performance in the presence of a metallic first wall, verify reduction in plasma heat loss from turbulence, and to confirm improved exhaust efficiency. Infinity One is being designed to demonstrate improved manufacturing, construction, and commissioning processes.
This investment round is yet another large investment in the commercial fusion industry and is continuing the strong momentum we have seen from the end of 2025 into early 2026.