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Pacific Fusion’s latest prototype packs 440 gigawatts into an 80-nanosecond burst

TechCrunch · Jun 2, 2026, 11:00 AM

Key takeaways

  • Pacific Fusion took the wraps off its latest pulser module prototype on Tuesday, a piece of equipment that allows the company to move ahead with its demonstration fusion power plant.
  • Results from the shipping container-sized prototype were good enough to unlock another tranche of Pacific Fusion’s Series.
  • The tranche-based model is more widely used in biotech, where it saves startups time on fundraising, allowing them to remain focused on hitting technical milestones.

Pacific Fusion took the wraps off its latest pulser module prototype on Tuesday, a piece of equipment that allows the company to move ahead with its demonstration fusion power plant. Construction on the fusion power plant is expected to begin this summer.

Results from the shipping container-sized prototype were good enough to unlock another tranche of Pacific Fusion’s Series. A round, which exceeds $1 billion, the company exclusively told Tech Crunch. The company did not disclose the size of the tranche. Pacific Fusion is among the best-funded fusion startups.

The tranche-based model is more widely used in biotech, where it saves startups time on fundraising, allowing them to remain focused on hitting technical milestones.

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