Commonwealth Fusion Systems just locked in its second billion-dollar power deal, this time with Italian energy giant Eni. The agreement for electricity from CFS's future Arc reactor marks a crucial step toward establishing commercial fusion power pricing and demonstrates growing corporate confidence in the technology that could revolutionize clean energy.
The fusion energy sector just got its biggest validation yet. Commonwealth Fusion Systems has inked a power purchase agreement worth more than $1 billion with Italian energy giant Eni, marking the second major commercial deal for electricity that doesn't exist yet.
The agreement covers power from CFS's Arc reactor, a 400-megawatt fusion plant planned for Richmond, Virginia, in the early 2030s. It's the second such deal for the Cambridge-based startup - Google already committed to buying half of Arc's output in a deal announced this June.
"One of the reasons we built Sparc is so that we could actually get the experience of what it's like to build a nearly full-scale system," CEO Bob Mumgaard told reporters last week, according to TechCrunch. "Arc will be the first of many that's backed by a supply chain that is primed for scale."
The timing couldn't be better for CFS. The company's demonstration reactor Sparc, currently 65% complete in Devens, Massachusetts, is on track to fire up in late 2026. That milestone will determine whether the company's tokamak design - using D-shaped superconducting magnets to confine superheated plasma - can actually generate more energy than it consumes.
But here's where things get interesting. Eni, one of the world's largest oil and gas companies, doesn't have U.S. operations that would consume gigawatts of electricity. "The power will be sent to the grid at the end of the day," Lorenzo Fiorillo, Eni's director of technology, R&D, and digital, confirmed to reporters.
In other words, Eni plans to resell the power - likely at a loss, given that first-generation fusion electricity will be expensive. So why would an energy giant sign up to potentially lose money on power trading?
The answer reveals the deal's real purpose: establishing fusion power pricing and unlocking project financing. Mumgaard admitted as much, explaining that the power purchase agreement "gives us the certainty of where the power is going to go, what the price is going to be, etc. And that allows us to then take that package to more financial investors in project finance and other areas."
This strategy makes sense given CFS's funding situation. The company has raised nearly $3 billion to date, including an $863 million Series B2 round announced last month backed by Nvidia, Google, Breakthrough Energy Ventures, and notably, Eni itself. Completing Sparc will likely exhaust a significant portion of those funds.
The agreements are structured to "walk the line" between punitive and collaborative, Mumgaard noted. The partners "understand these challenges that come from first of a kind. No one in this situation is like, oh, you know, invent an entire new technology, an entire industry, and if it doesn't work on this day, we're just going to walk away."
That collaborative approach reflects the high stakes involved. CFS is widely regarded as a leader in the fusion industry, frequently updating scientists on its progress and running extensive simulations to identify potential hurdles. The company's tokamak design builds on decades of research into confining plasma hot enough for fusion reactions.
The Richmond location for Arc wasn't chosen randomly either. Virginia hosts some of the country's highest concentrations of data centers - exactly the kind of power-hungry infrastructure that Google operates and that's driving massive demand for clean electricity.
While Google has hinted it'll use Arc's electricity for its data centers, Eni's play appears more strategic. By securing a position in fusion power's commercial launch, the oil giant gains insight into technology that could eventually reshape global energy markets.
The Eni deal represents more than just another power purchase agreement - it's a bet on fusion energy's commercial viability and a crucial step toward establishing market pricing for what could become the world's cleanest baseload power source. With Sparc's 2026 demonstration approaching and Arc's early 2030s timeline, CFS is positioning itself to lead the transition from fusion research to fusion commerce. The question now isn't whether fusion will work, but whether CFS can execute on the timeline and scale that billion-dollar deals demand.
