Type One Energy–TVA agreement

Overview

The Type One Energy–Tennessee Valley Authority (TVA) agreement is a formal public-private partnership aimed at deploying a fusion power plant (FPP) in the United States. Announced in June 2023, the agreement outlines a collaborative effort to commercialize fusion energy, with Type One Energy developing its stellarator-based Infinity One pilot plant at TVA's decommissioned Bull Run Fossil Plant site in Clinton, Tennessee. The partnership is significant as it is one of the first instances of a major U.S. utility formally engaging with a private fusion developer to site and potentially operate a grid-scale fusion facility. The agreement leverages Type One Energy's stellarator expertise, TVA's experience in power generation and regulatory affairs, and the proximity of Oak Ridge National Laboratory (ORNL) to create a dedicated fusion development hub.

Agreement Structure and Objectives

The collaboration is structured as a multi-phase agreement designed to de-risk the project from both a technical and financial perspective. The core objective is the successful construction and operation of Infinity One, a fusion pilot plant intended to demonstrate the viability of the stellarator concept for commercial electricity production. The agreement is not a power purchase agreement (PPA) but rather a framework for joint development.

Key components of the agreement include:

Site Provision: TVA provides access to the 350-acre Bull Run site, which offers existing infrastructure such as high-voltage transmission lines, cooling water access from the Clinch River, and a skilled local workforce. TVA's role includes managing the site and supporting the necessary environmental and regulatory reviews.
Technical Development: Type One Energy is responsible for the design, construction, and commissioning of the Infinity One stellarator. This includes developing the necessary high-temperature superconducting (HTS) magnets, plasma heating systems, and balance of plant. The company plans to invest up to $200 million in the initial phases of the project.
Due Diligence and Gated Milestones: The partnership proceeds through a series of defined milestones. TVA's commitment is contingent upon Type One Energy meeting specific technical, financial, and regulatory targets. This gated approach allows both parties to manage risk and ensures that progress is validated before committing to subsequent, more capital-intensive phases like full-scale construction.
Regulatory Pathway: A central objective is to navigate the U.S. regulatory framework for fusion energy. The partners will work with the Nuclear Regulatory Commission (NRC) to establish a licensing basis for a stellarator FPP, likely under the NRC's proposed Part 53 rule for fusion energy systems.

Historical Development

The agreement emerged from converging interests in the early 2020s. Type One Energy was founded by a team of leading stellarator physicists from the University of Wisconsin-Madison, the Massachusetts Institute of Technology, and ORNL, aiming to commercialize decades of public research in stellarator design. The company's strategy focused on leveraging recent advances in computational design and high-temperature superconducting magnets to build a more compact and economically viable stellarator.

Simultaneously, TVA, as part of its long-term decarbonization strategy, began exploring advanced nuclear technologies beyond traditional light-water reactors. In February 2022, TVA launched its New Nuclear Program to investigate technologies including small modular reactors and fusion energy. This program created the institutional framework for partnerships with advanced energy developers.

Discussions between Type One Energy and TVA began in 2022, facilitated by the strong existing relationship between TVA and nearby ORNL, a key U.S. Department of Energy (DOE) center for fusion science and materials research. The Bull Run Fossil Plant, which ceased operations in December 2023, was identified as an ideal site for redevelopment due to its grid infrastructure and strategic location within the 'Tennessee Fusion Energy Valley'. The formal agreement was announced on June 22, 2023, by Tennessee Governor Bill Lee, TVA CEO Jeff Lyash, and Type One Energy CEO Christofer Mowry.

Current Status

As of early 2026, the partnership is in the pre-construction and design validation phase. Type One Energy has established its headquarters in East Tennessee and is actively engaged in detailed engineering design for the Infinity One device. Key activities include finalizing the magnet configuration, developing the tritium fuel cycle systems, and refining the overall plant layout. The company is working closely with scientists at ORNL to validate physics models and test critical components.

On the site development front, TVA is proceeding with the decommissioning and remediation of the former coal-fired plant at Bull Run. This process runs parallel to the environmental analysis required under the National Environmental Policy Act (NEPA) for the proposed fusion facility. The NEPA process, initiated in 2024, is a critical step that must be completed before any construction can begin. The partners are also in the early stages of pre-application engagement with the NRC to socialize the Infinity One design and establish a clear regulatory path forward.

Notable Implementations

The most notable implementation of this agreement is the selection and planned development of the Bull Run Fossil Plant site. This marks a tangible step in the transition from fossil fuels to advanced clean energy sources, repurposing legacy energy infrastructure for a next-generation technology. The project is a cornerstone of the 'Tennessee Fusion Energy Valley' initiative, a regional economic development strategy supported by state and local governments to attract fusion-related supply chain companies and talent to East Tennessee.

The partnership itself serves as a model for how public utilities can engage with the nascent fusion industry. Unlike speculative investments, the TVA agreement is a hands-on collaboration focused on a specific site and project. It provides a template for risk-sharing, where the private entity leads technological innovation and the public utility provides essential infrastructure, operational expertise, and a clear path to market. This model is being watched closely by other utilities considering how to incorporate fusion into their long-range generation plans.

Open Challenges

Despite the promising start, the project faces substantial challenges:

Technical Readiness: The stellarator is a less mature concept than the tokamak. Type One Energy must demonstrate that its optimized, high-field design can achieve the required plasma performance, particularly achieving high density and temperature while maintaining plasma stability. Manufacturing the complex, asymmetrically shaped HTS magnets at scale is a primary engineering hurdle.
Regulatory Uncertainty: While the NRC is developing a technology-neutral framework (Part 53), no fusion power plant has ever been licensed in the U.S. The partnership must navigate a first-of-a-kind regulatory process, establishing safety cases for systems involving tritium handling, neutron activation, and waste disposal.
Capital Investment: While initial funding is in place, constructing a full-scale fusion pilot plant will require billions of dollars. Type One Energy must secure significant future funding rounds from private investors and potentially government programs to move from design to construction. The project's continuation is contingent on meeting milestones that satisfy both TVA and investors.
Supply Chain Development: The specialized components for a stellarator, from HTS tape to vacuum vessel segments and specialized divertor materials, require a robust supply chain that is still in its infancy. Building this supply chain will be critical to meeting construction timelines and cost targets.

Outlook

The credible 5- to 15-year trajectory for the Type One Energy–TVA agreement is contingent on successfully navigating the aforementioned challenges. In the near term (2026-2030), the focus will be on completing the Infinity One engineering design, securing major long-lead components, and successfully concluding the NEPA and NRC pre-licensing processes. A key milestone will be the final investment decision and the start of construction, targeted for the late 2020s.

Assuming these milestones are met, the period from 2030 to 2035 will be dominated by the construction, assembly, and commissioning of the Infinity One plant. The ultimate goal is to achieve first plasma in the early 2030s and subsequently demonstrate net electricity production. If successful, the project would not only validate Type One's stellarator technology but also provide an invaluable blueprint for the commercial deployment of fusion energy on the U.S. grid. The success or failure of this pioneering partnership will have significant implications for the timeline of commercial fusion energy in North America.

References

TVA, Type One Energy to Develop Fusion Energy Technology in East Tennessee — Tennessee Valley Authority (2023)
Type One Energy to establish operations in East Tennessee — Oak Ridge National Laboratory (2023)
A star is born: Inside the Tennessee Valley's plan to become a fusion energy hub — Utility Dive (2023)
TVA Board Approves Pursuing Advanced Nuclear Technology — Tennessee Valley Authority (2022)
Type One Energy to Invest More Than $223 Million to Establish Operations in East Tennessee — Tennessee Department of Economic and Community Development (2024)
Fusion energy is having a moment. Is it the future of the grid? — Canary Media (2023)
NRC Staff Activities on the Regulation of Fusion Energy Systems — U.S. Nuclear Regulatory Commission
Bull Run Fossil Plant — Tennessee Valley Authority