Commonwealth Fusion Systems (CFS) has secured a deal exceeding $1 billion with Italian energy giant Eni for power from its upcoming fusion reactor.
The innovative power plant will be constructed near Richmond, Virginia, strategically located amidst one of the most concentrated clusters of data centers in the U.S. The 400-megawatt fusion reactor, named Arc, is anticipated to commence operations in the early 2030s, according to CFS CEO Bob Mumgaard.
This agreement with Eni marks the second major partnership for CFS; in June, tech giant Google announced it would procure half of the reactor’s energy output. Neither CFS nor Eni, however, disclosed specific details regarding the power quantity involved in their recent collaboration or its delivery timeline.
Currently, CFS is making significant strides with its demonstration-scale Sparc reactor located in Devens, Massachusetts, which is reported to be 65% complete. The company maintains that Sparc will be operational by late 2026, a timeline confirmed by Mumgaard himself.
“Sparc was designed to give us firsthand experience in constructing a near-full-scale system,” Mumgaard explained. “Arc will represent the first of several reactors that will be supported by a supply chain fully geared for large-scale production.”
Recognized as a pioneer within the fusion energy sector, CFS’s reactor utilizes a tokamak design featuring D-shaped superconducting magnets that confine and compress superheated plasma. Within this plasma, particles collide to form new atoms and release energy as a byproduct. The company maintains close communications with the scientific community to monitor progress and has conducted extensive simulations to identify and address potential challenges.
CFS anticipates that Sparc will generate more energy than needed to sustain the fusion processes. However, definitive results will not be available until the reactor is completed. This venture is expected to consume a significant portion of the nearly $3 billion raised to date, including an $863 million Series B2 funding round recently finalized. This round attracted investments from a diverse array of backers, including Nvidia, Google, Breakthrough Energy Ventures, and Eni.
The future of CFS’s contracts with Google and Eni does raise important questions: What happens if there are delays, or if the reactors fail to perform as anticipated?
Mumgaard revealed that these agreements have been meticulously structured to strike a balance between being penalizing and collaborative. He emphasized that all parties understand the inherent challenges that accompany pioneering projects. “No one involved here is expecting a flawless transition into an entirely new technology or industry,” he stated. “If hurdles arise, there’s an understanding that we don’t simply abandon the initiative.”
While Google is likely to utilize the electricity from Arc to power its extensive data centers, Eni, one of the world’s largest oil and gas corporations, does not maintain operations in the U.S. that would necessitate such a vast energy supply.
As explained by Lorenzo Fiorillo, Eni’s Director of Technology, R&D, and Digital, “The power generated will ultimately be delivered to the grid.”
This implies that Eni plans to resell the electricity. Given that Arc is a pioneering reactor, the electricity produced is expected to come at a premium cost, potentially leaving Eni at a loss when trading that power on the grid.
The true intent behind this agreement appears to be establishing a market price for fusion-generated power, while simultaneously securing additional funding for Arc’s construction.
Mumgaard acknowledged this strategy: “The power purchase agreement provides us with assurance regarding the power’s destination, pricing structure, etc. This certainty equips us to engage more effectively with financial investors in project financing and other areas, paving the way for discussions on how to finance this groundbreaking plant.”
