Industrials

Cedar

Fusion reactors for ships

YC Batch:

YC Batch:

Winter 2025

Justin Cohen

Co-Founder CTO

Founders and early team combine backgrounds in plasma physics nuclear/electrical engineering and hardware from organizations including Columbia University University of Pennsylvania Tesla and SpaceX; experience building HTS magnets power electronics and tokamak research.

Total Raised

$5M

Stage

Early

Latest Round

Seed

Industry

Industrials

About

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 were 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.

Key Investors

Trucks VC Paul Graham Y Combinator Aaron Epstein Alumni Ventures Aera VC

Company Snapshot

Employee Count

6

Status

Active

Tags

Fusion Energy Hard Tech Energy

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