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Maritime Fusion, a company founded by former Tesla engineers, has raised $4.5 million in seed funding to advance its fusion energy technology for maritime and off-grid use cases.
The company is developing a low-power-density tokamak reactor designed to address key engineering challenges and make fusion more practical for commercial deployment.
Maritime Fusion’s approach centres on reactors with lower power density than traditional tokamak designs. According to the company, this configuration helps manage issues such as power exhaust, nuclear activation, and long-term maintenance requirements.
By reducing these operational burdens, Maritime Fusion aims to create a system suitable for decentralised and off-grid environments, including remote industrial sites and maritime vessels.
The company’s leadership team brings experience from advanced energy and hardware engineering roles, with several founders and early team members previously working at Tesla. Maritime Fusion’s aim is to develop a pathway to compact fusion systems that can serve industries where conventional grid power or large-scale reactors are not feasible.
Alongside its reactor development, Maritime Fusion is advancing a high-temperature superconducting (HTS) cable programme. The company recently reached a milestone with an HTS cable carrying 5,000 amps at 77K during a liquid-nitrogen-cooled bench test.
Maritime Fusion plans to apply this cable technology both to fusion magnets and to commercial power distribution markets. One of the first planned commercial applications is within the AI data centre sector, where the company believes HTS conductors could reduce electrical losses and improve efficiency.
The seed round includes participation from Trucks VC, Paul Graham, Alumni Ventures, Y Combinator, and Aera VC. The investor group reflects a mix of climate-tech, deep-tech, and mobility-focused backers, underscoring interest in early-stage fusion technologies that target real-world deployment rather than utility-scale grid applications.
Maritime Fusion is expanding its team to support development across reactor engineering, superconducting systems, and commercial applications.
The company is recruiting for roles in hardware, plasma physics, cryogenics, and power electronics as it accelerates work on both its fusion and HTS cable programmes.
The company’s long-term goal is to bring compact, reliable fusion systems to maritime and off-grid industries, offering an alternative power source for vessels and operations that require high energy availability in remote conditions.
