Privately held fusion energy technology company · Marine fusion power and high-temperature superconducting systems

Maritime Fusion

Infraday-curated

San Francisco, California, United States

Compact fusion reactors and superconducting power systems for ships, off-grid sites and data centers

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Overview

Maritime Fusion is developing compact, high-field tokamak fusion reactors for ships and other off-grid applications where energy density and reliable power are critical. Its Yinsen concept targets marine propulsion and onboard electricity generation, while the company is also commercializing high-temperature superconducting technology through its SHIELD power cable for high-current data-center distribution. Founded in 2024 and based in San Francisco, Maritime Fusion participated in Y Combinator’s Winter 2025 batch. The company also reports sponsored research with Columbia University and use of the U.S. Department of Energy’s DIII-D fusion facility.

Infrastructure sectors

Fusion energyMaritimeData centersOff-grid power

Capabilities & services

High-field tokamak design
High-temperature superconductors
Cryogenic systems
Marine power integration

Fusion reactor research and developmentHigh-temperature superconducting cable developmentMarine power-system engineering

Startup solution

What they supply: Energy systems
Relevant buyers: Shipping companies and off-grid energy developers

Profile information

Infraday-curated. Claim status confirms profile management rights and does not imply independent verification.

Last editorial check: 2026-10-11.

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