Title: Pacific Fusion’s New Prototype Delivers 440 Gigawatts in an 80-Nanosecond Pulse

On Tuesday, Pacific Fusion unveiled a new prototype of its pulser module, a critical component that will enable the company to proceed with the construction of its demonstration fusion power plant. With construction slated to begin this summer, the successful testing of the shipping container-sized unit has secured an additional tranche of funding for the startup. According to an exclusive report to TechCrunch, this latest tranche is part of Pacific Fusion’s Series A round, which has now surpassed $1 billion in total commitments, though the specific value of this new tranche was not disclosed.

As one of the most heavily capitalized fusion startups, Pacific Fusion utilizes a tranche-based funding structure common in the biotech industry. This model allows companies to conserve time by tying capital releases to the achievement of technical milestones, rather than requiring continuous fundraising efforts. Pacific Fusion Chief Technology Officer Keith LeChien explained to TechCrunch that this arrangement enables the team to maintain focus on engineering goals. “It means that we can lean into the future without spending 20% to 50% time constantly looking for the next piece of capital,” LeChien said, noting that it allows them to “keep our heads down.”

Pacific Fusion is developing a form of inertial confinement fusion. The design calls for 156 pulser modules to deliver a massive electrical surge to a small fuel target within the reactor chamber. This pulse generates a magnetic field surrounding the eraser-sized fuel pellet, compressing it until the atoms fuse and release significant energy. While the startup aims for the demonstration plant to generate more electricity than it consumes—a goal that remains unachieved by any fusion facility to date—it is not delaying construction to wait for full-scale pulser module results. “The shovels go in the ground for that facility this summer,” LeChien confirmed.

To date, inertial confinement is the sole method proven capable of achieving scientific breakeven, where a controlled fusion reaction yields more energy than was used to initiate it. Only one experiment, conducted at the National Ignition Facility (NIF) at Lawrence Livermore National Laboratory, has successfully replicated these results. However, unlike NIF’s reliance on costly, large-scale lasers, Pacific Fusion plans to use thousands of more affordable electrical switches and capacitors. These components will be synchronized to produce massive, precisely timed electrical pulses lasting approximately 100 nanoseconds. The primary engineering challenge lies in ensuring the capacitors discharge their energy at the exact right moment; any delay would prevent the fuel pellet from compressing rapidly enough to trigger fusion.

The final demonstration device will feature 156 full-size pulser modules. Each module is designed with 32 circular stages, with each stage encircled by 10 bricks. Each brick houses two capacitors for power storage and one switch to release the energy. The recently tested prototype, which represents roughly one-third of the full module’s size, contains nine stages and 90 bricks. During testing, it delivered a peak power output of 440 gigawatts in just 80 nanoseconds. “It meets all our requirements for scaling up to build our big demonstration system,” LeChien stated.

Looking ahead, Pacific Fusion intends to move beyond scientific breakeven directly to facility breakeven once its demonstration plant is operational. This milestone involves generating sufficient energy to power the entire facility. “Any fusion approach, regardless of your specific technology, has to traverse through that,” LeChien said, describing it as “the next tectonic milestone in fusion.”

Source: TechCrunch Generated at: 2026-06-02 11:00:00 UTC