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YCW25· Other

Maritime Fusion

Fusion reactors for ships

ActiveChecked 17h ago
Batch
W25
Status, per YC
Active
Team size
6
HQ
San Francisco, CA
In W25165 companies, 83% AI
maritimefusion.comYC profile

Founders

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About Maritime Fusion

Maritime Fusion is building fusion reactors for ships and off grid energy markets. En route on this endeavor we’re commercializing High Temperature Superconducting (HTS) cable technology for power distribution while advancing the physics basis of our HTS tokamak to decarbonize global shipping. Breakeven fusion is coming soon, but the first-of-a-kind (FOAK) reactors will be costly, high maintenance, and have low capacity factors, leading to 5–10x higher electricity cost on the grid. Maritime Fusion is pursuing the most widely accepted approach to fusion, the tokamak, but specifically designed for the marine environment where the challenges that arise between breakeven and a commercially viable energy source are alleviated. The market we're targeting requires 15x less power, lower up-time, and costs the same as alternative fuels but without any emissions. Since fusion does not use highly radioactive fuels or materials – unlike fission – we sidestep the vast majority of regulatory challenges and safety risks associated with nuclear energy. Our team brings over a decade of industry and research experience in plasma physics, nuclear engineering, and electrical engineering with backgrounds at SpaceX, Tesla, Columbia University, and University of Pennsylvania.

San Francisco, CA, USA

Maritime Fusion: questions

Which YC batch was Maritime Fusion in?

Maritime Fusion was in Y Combinator's Winter 2025 batch (W25).

Is Maritime Fusion still active?

Y Combinator lists Maritime Fusion as active.

Where is Maritime Fusion based?

Maritime Fusion lists San Francisco, CA, USA as its location on YC's directory.

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