---
title: "Type One Energy Raises $200M Series B for Fusion"
description: "Type One Energy completed a $200M Series B led by Breakthrough Energy Ventures and Clutterbuck Capital to advance Project Infinity."
date: 2026-10-07T20:23:00.000Z
source: https://venturecapitaltracker.com/2026-type-one-energy-200m-series-b-commercial-fusion
---

# Type One Energy Raises $200M Series B for Fusion

> Type One Energy completed a $200M Series B led by Breakthrough Energy Ventures and Clutterbuck Capital to advance Project Infinity.

# Type One Energy Raises $200M Series B for Commercial Fusion

Type One Energy has completed a **$200 million Series B** to advance its stellarator fusion program and the development of a commercial power plant in Tennessee.

**Breakthrough Energy Ventures** and **Clutterbuck Capital** co-led the round. Lowercarbon Capital, Siemens Energy Ventures, SiteGround Capital and other new investors participated. The company did not disclose a valuation.

The financing supports Type One's **FusionDirect** program and **Project Infinity** at the Tennessee Valley Authority's former Bull Run coal-plant site. Project Infinity includes the Infinity One engineering prototype and **Infinity Two**, a planned 400-megawatt commercial fusion power plant.

Type One is targeting 2034 for commercial operation. That is a company schedule for a first-of-a-kind plant, not an independently validated completion date.

## Why Type One chose a stellarator

Most heavily funded private fusion companies use tokamaks, pulsed systems or inertial-confinement approaches. Type One is developing a stellarator: a magnetic-confinement device whose external magnets create a twisted field that can hold plasma in a steady state.

Stellarators avoid the large plasma current used by tokamaks and may ultimately support continuous operation. Their tradeoff is engineering complexity. The magnets and surrounding structures must be designed and manufactured to demanding three-dimensional tolerances.

Type One's founders emerged from stellarator research at the University of Wisconsin–Madison. The company says decades of public research have reduced the main plasma-physics uncertainty and that the remaining challenge is industrial execution. That is the central claim investors are financing.

## A partner-heavy route to market

Type One does not plan to manufacture every component or own every commercial plant. It wants to operate more like a systems integrator and technology supplier, working with utilities, engineering firms and specialist manufacturers.

TVA supplies a potential deployment site. AECOM is participating in plant engineering. Commonwealth Fusion Systems has licensed high-temperature superconducting magnet technology to Type One. Siemens Energy Ventures' participation adds another industrial connection.

This model can reduce the capital Type One must raise compared with a vertically integrated developer. It also shifts risk into supplier coordination. The company must validate interfaces among magnets, structures, plasma systems, heat extraction and conventional power equipment while maintaining quality across multiple partners.

Large industrial programs have repeatedly shown that outsourcing can lower fixed costs while making schedule and quality failures harder to control. Type One will need unusually strong systems engineering and supplier governance.

## How much Type One has raised

The company's disclosed financing history includes:

| Date | Financing | Amount |
|---|---|---:|
| March 2023 | Seed | $29M |
| July 2024 | Seed extension | $53.5M |
| January 2026 | Reported convertible note | $87M |
| October 2026 | Series B | $200M |

The first two transactions together formed an $82.5 million seed financing. TechCrunch reported the January convertible note and said Type One was then seeking a $250 million Series B at a $900 million pre-money valuation. The completed Series B is smaller at $200 million, while the final valuation was not disclosed.

Adding the publicly reported instruments produces at least **$369.5 million** of disclosed financing. That calculation should not be confused with cash remaining or the estimated cost of reaching commercial power.

## What the Series B can finance

Chief executive Christofer Mowry told TechCrunch that the new round should take Type One approximately halfway to groundbreaking on Infinity Two. The capital therefore does not fully finance construction or operation of the commercial plant.

Nearer-term milestones include:

- Completing engineering work for Infinity One and Infinity Two.
- Demonstrating that optimized stellarator designs can be manufactured within tolerances.
- Expanding the licensing basis beyond the initial Tennessee approval.
- Locking in industrial suppliers and project partners.
- Establishing a financeable cost and construction schedule for Infinity Two.

Tennessee has granted an initial operating license associated with Project Infinity. This is meaningful regulatory progress, but it is not evidence that a commercial fusion plant has been built, commissioned or demonstrated net electricity production.

## Competition and execution risk

Type One competes for capital, engineering talent and utility partners with Commonwealth Fusion Systems, Helion, TAE Technologies, Pacific Fusion and Proxima Fusion, among others. Some rivals have raised substantially more capital or are pursuing designs with earlier demonstration schedules.

Type One's differentiated bet is that an optimized stellarator plus an industrial-partner model can deliver reliable steady-state power without the expense of building an entire manufacturing ecosystem internally.

Investors now have to watch whether the company converts scientific confidence into verified engineering data. The critical questions are not whether stellarators can confine plasma—they can—but whether Type One can build a maintainable power plant, manage its supply chain and produce electricity at a cost utilities will accept.

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.