Maritime Fusion
🇺🇸 San Francisco, US · Active
Maritime Fusion is a San Francisco start-up, founded by former Tesla engineers, that plans to build a tokamak fusion reactor with high-temperature superconducting magnets to power large ships and off-grid sites. Its first design, called Yinsen, is intended to produce tens of megawatts of electricity (the company's website gives about 25 to 70 MWe), far less than a grid-scale plant, which the company argues eases the materials problems of high-power fusion. It says it will go straight to a full-scale unit without an intermediate experiment and targets first deployment in 2032. Alongside the reactor it is developing high-temperature superconducting cables for power distribution. In November 2025 it closed a $4.5 million seed round led by Trucks VC.
- Sector
- Fusion
- Technology
- Tokamak
- Role
- Fusion developer
Its recorded equity, $5m, is the 25th largest of the 25 organisations with a priced round here. Not every round is on record, so this is not its total raised.
Terms
- Tokamak
- Doughnut-shaped magnetic confinement using a strong toroidal field plus a current driven through the plasma itself. The most-studied configuration, and the one ITER uses. Its main open problem is heat exhaust at the divertor, where the plasma edge concentrates power onto a small area, together with the risk of disruptions: sudden, uncontrolled losses of the plasma current.
Funding
- 2025-11Equity round · SeedSeed round led by Trucks VC, with Aera VC, Alumni Ventures, Y Combinator and angel investors.$5m
People
- Justin CohenCEO
Related companies
- Commonwealth Fusion Systems
- Energy Singularity
- Firefly Fusion
- General Atomics
- Institute of Plasma Physics, Chinese Academy of Sciences
- ITER Organization
- Korea Institute of Fusion Energy
- Max Planck Institute for Plasma Physics
- MIT Plasma Science and Fusion Center
- National Nuclear Center of the Republic of Kazakhstan
- Pranos Fusion
- UK Atomic Energy Authority