A fusion reactor is, at its core, a very complicated way to boil water. The physics are spectacular, but the unit economics are what matter. Pacific Fusion, a two-year-old startup, has raised $900 million on the idea that the most promising path to those economics isn't a giant laser or a doughnut-shaped magnet, but a bank of capacitors that can dump a city's worth of electricity into a tiny target in a hundred-billionth of a second.
Inspired by the Z-machine at Sandia National Laboratories, the company is pursuing magnetized liner inertial fusion, or MagLIF. The concept is to use a short, intense pulse of electricity to crush a magnetized plasma target, achieving fusion conditions. The appeal for a commercial venture is a certain brutal simplicity: the primary driver is a pulsed power system, a piece of electrical engineering that can be modularized and, in theory, mass-produced. It is a bet on capacitors and switches over custom-cut crystals and superconducting coils.
The physics of a power plant
Pacific Fusion's design is a direct descendant of decades of government-funded research. The National Ignition Facility's 2022 ignition milestone proved the physics of inertial confinement fusion could work. Sandia's Z-machine, which uses massive capacitor banks to generate immense magnetic fields, proved pulsed power could create the extreme pressures needed. Pacific Fusion is trying to merge those threads into a system designed from the start for net facility gain, where the total energy output from a reactor exceeds the total energy required to run the entire facility, not just the energy hitting the target.
The core of their reactor is a pulsed power module, developed in collaboration with defense contractor General Atomics [General Atomics, Apr 2025]. These modules are essentially enormous, rapid-fire batteries. They store energy and release it in a pulse lasting about 100 nanoseconds, sending a current of tens of millions of amps through a cylindrical target. That current creates a magnetic field that implodes the target, compressing and heating the deuterium-tritium fuel inside to fusion conditions [Lowercarbon Capital, 2025]. The company's focus is on scaling these modules and making the targets cheap and repeatable enough for a power plant.
A team built for the long game
The founding group brings a mix of scientific credibility, operational experience, and political heft, which is arguably the minimum viable profile for a venture asking for nearly a billion dollars to chase a decades-old dream.
| Founder / Executive | Role | Notable Background |
|---|---|---|
| Eric Lander | Founding CEO | Former Director, White House Office of Science and Technology Policy; founding director of the Broad Institute [Bloomberg, Feb 2022] |
| Will Regan | President & Co-founder | Previously a project lead at X [Crunchbase, retrieved 2026] |
| Keith LeChien | CTO & Co-founder | |
| Carrie von Muench | COO & Co-founder |
Lander's presence signals a company built to navigate the complex interface of advanced science, big capital, and public policy. The rest of the team, which the company says numbers over 110, is filled out with veterans from fusion research, power infrastructure, and materials science [Pacific Fusion, retrieved 2026]. This isn't a garage project; it's an industrial effort from day one.
Why investors are writing checks now
The $900 million Series A, led by General Catalyst and closed in March 2025, is one of the largest single rounds ever for a private fusion company [PitchBook, Mar 2025]. The investor list reads like a who's who of climate tech conviction capital: Breakthrough Energy, Lowercarbon Capital, Trousdale Ventures, and individuals like Reid Hoffman and John Doerr. The round is reportedly structured in milestone-based tranches, a sensible approach for a project with a decade-long timeline [Private candid take].
The bet hinges on two converging trends. First, the scientific validation from national labs has moved fusion from pure theory into the realm of engineering. Second, the demand for always-on, carbon-free power is becoming acute, driven by data centers, industrial electrification, and grid decarbonization. Investors are placing a spread of bets across different fusion approaches, and Pacific Fusion's pulsed-power path represents a distinct, hardware-oriented thesis.
The New Mexico gambit
In September 2025, the State of New Mexico announced a $1 billion partnership with Pacific Fusion to build a research and manufacturing campus [Office of the Governor of New Mexico, Sep 2025]. The deal is more than a ribbon-cutting; it's a critical piece of infrastructure de-risking. The state is providing land, incentives, and a clear path to permitting for a first-of-its-kind facility. In return, Pacific Fusion promises over 200 long-term jobs and hundreds more in construction.
This partnership accomplishes several things. It provides a physical home for building and testing production-scale pulser modules. It locks in a potential early adopter region for demonstration power. And it signals to other utilities and governments that this is a serious project with a tangible address. The company says manufacturing operations at the site are slated to begin before the end of 2025 [Pacific Fusion, retrieved 2026].
The incumbent in the crosshairs
Every new energy technology defines itself against what came before. For fusion, the obvious incumbent is fission. The economic hurdle isn't just scientific breakeven; it's beating the levelized cost of energy from advanced nuclear fission plants, which themselves are fighting to get below $100 per megawatt-hour. Pacific Fusion's entire premise of modular, manufacturable components is an argument against the bespoke, one-of-a-kind complexity and cost that has plagued traditional fission.
A back-of-the-envelope calculation illustrates the scale of the challenge. The company is targeting net facility gain by 2030 [ANS / Nuclear Newswire, Apr 2025]. Assuming they hit that, commercial deployment would follow in the 2030s. To matter for climate goals, they'd need to be building gigawatts of capacity per year. That means moving from a research campus to an industrial supply chain capable of producing thousands of those capacitor and target modules annually. It's a manufacturing problem as much as a physics one.
Pacific Fusion isn't just competing with other fusion startups like Commonwealth Fusion Systems or Helion. To be a success, it must ultimately beat the economic and regulatory inertia of the existing nuclear industry. Its bet is that a machine you can build in a factory, not a one-of-a-kind civil engineering project, is the only way to do that.
Sources
- [Pacific Fusion, Nov 2024] Milestone announcement | https://www.pacificfusion.com/
- [Office of the Governor of New Mexico, Sep 2025] Governor announces $1 billion fusion research and manufacturing campus | https://www.governor.state.nm.us/2025/09/26/governor-announces-1-billion-fusion-research-and-manufacturing-campus-in-new-mexico-pacific-fusion-project-will-create-hundreds-of-jobs/
- [ANS / Nuclear Newswire, Apr 2025] Net gain target | https://events.economist.com/fusion-fest/agenda-2026/
- [Pacific Fusion, retrieved 2026] Company website | https://www.pacificfusion.com/
- [Lowercarbon Capital, 2025] Technology description | https://lowercarbon.com/company/pacific-fusion/
- [General Atomics, Apr 2025] Collaboration announcement | https://www.ga.com/news/press-releases/2025/general-atomics-to-collaborate-with-pacific-fusion
- [PitchBook, Mar 2025] Series A funding round | https://pitchbook.com/profiles/company/534408-76
- [Bloomberg, Feb 2022] Eric Lander background | https://www.bloomberg.com/news/articles/2022-02-08/embattled-biden-science-adviser-eric-lander-resigns-after-outcry
- [Crunchbase, retrieved 2026] Will Regan background | https://www.crunchbase.com/organization/pacific-fusion
- [MCJ Collective, Feb 2025] Investment thesis | https://newsletter.mcj.vc/p/pacific-fusion