In May 2023 C.E., Helion Energy announced a power purchase agreement with Microsoft — the first commercial contract of its kind in the history of fusion energy. Under the deal, Helion’s first fusion power plant will supply Microsoft with electricity, with Constellation serving as power marketer and managing transmission for the project.
At a glance
- Fusion power purchase agreement: Helion’s planned plant targets 50 MW or greater of power generation after a one-year ramp-up period, with a target operational date of 2028 C.E.
- Commercial fusion milestone: The agreement marks the first time a private fusion company has entered a binding electricity supply contract with a major corporate customer.
- Clean energy goals: The deal supports Microsoft’s target of becoming carbon negative by 2030 C.E. and advances broader efforts to bring new zero-carbon sources onto the grid.
Why this agreement matters
Fusion energy — the process that powers the sun — has been studied since the mid-twentieth century. Its appeal is clear: it can produce vast amounts of energy without carbon emissions and without generating long-lived radioactive waste. The challenge has always been engineering a machine that produces more energy than it consumes, reliably and at commercial scale.
A power purchase agreement, or PPA, is the mechanism by which electricity projects get financed and built. Utilities, solar farms, and wind developers all use them. Until now, no fusion project had reached the stage where one was possible. The fact that a Fortune 500 company is willing to sign one signals that at least some in the energy industry take near-term commercial fusion seriously.
Constellation’s involvement adds another layer of credibility. As one of the largest power producers in the United States, Constellation will handle the grid-side logistics — transmission, scheduling, and carbon-free energy matching — that turn a science project into a functioning electricity supplier.
Helion’s path to this point
Helion has been developing its fusion approach for more than a decade. The company has built six working prototypes and became the first private fusion company to reach plasma temperatures of 100 million degrees Celsius with its sixth prototype — a threshold widely cited as necessary for fusion reactions to become self-sustaining.
At the time of the announcement, Helion was building its seventh prototype, which the company expected would demonstrate the ability to produce electricity in 2024 C.E. The commercial plant that would fulfill the Microsoft agreement is a separate, subsequent step — planned for 2028 C.E.
The timeline is notably aggressive. Most projections for commercial fusion power have pointed to the 2040s or later. Helion’s 2028 C.E. target places it well ahead of those estimates, which is both an encouraging sign and a reason for measured expectations.
What the companies said
“This collaboration represents a significant milestone for Helion and the fusion industry as a whole,” said David Kirtley, CEO of Helion. “We still have a lot of work to do, but we are confident in our ability to deliver the world’s first fusion power facility.”
Brad Smith, Vice Chair and President at Microsoft, framed the agreement in terms of market development as well as carbon goals. “Helion’s announcement supports our own long-term clean energy goals and will advance the market to establish a new, efficient method for bringing more clean energy to the grid, faster,” he said.
For Microsoft, the deal fits into a broader sustainability push. The company has pledged to be carbon negative by 2030 C.E. — meaning it would remove more carbon from the atmosphere than it emits. Sourcing power from a zero-carbon fusion plant would contribute directly to that target.
The bigger picture for fusion
The announcement arrived just months after the U.S. National Ignition Facility at Lawrence Livermore achieved fusion ignition in December 2022 C.E. — the first time a fusion experiment produced more energy than the laser energy delivered to the fuel. That scientific breakthrough and Helion’s commercial agreement together marked a turning point in public and investor attention toward fusion.
Private investment in fusion has grown sharply in recent years. A Fusion Industry Association report noted cumulative private investment in the sector had surpassed $6 billion by mid-2023 C.E., with more than 40 companies worldwide pursuing different technical approaches.
None of that investment guarantees success. Fusion has a long history of promising results that proved harder to replicate or scale than initially hoped. Helion’s 2028 C.E. target remains unproven, and the company still needs its seventh prototype to perform as expected before a commercial plant becomes realistic. The gap between a signed agreement and delivered electricity is significant — and the engineering challenges between here and 2028 C.E. are real.
Still, the fact that a commercial power purchase agreement now exists — with a defined megawatt target, a named power marketer, and a publicly stated timeline — moves fusion from a research aspiration to an item on an energy buyer’s procurement list. That shift in status, whatever the ultimate outcome, is something new.
For a world working through the hard math of decarbonizing electricity grids, adding a potential zero-carbon baseload source to the mix matters — even if that source is still years away from proving itself at scale.
Read more
For more on this story, see: Helion Energy
For more from Good News for Humankind, see:
- Indigenous land rights gain momentum ahead of COP30
- Renewables now make up at least 49% of global power capacity
- The Good News for Humankind archive on clean energy
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