Atomarine raises $19 million seed round for floating data centres with ship-borne power

Atomarine, a Cambridge, Massachusetts, startup that plans data centres on barges at sea, said on 6 November 2026 that it has raised a $19 million seed round. In a post on the company's LinkedIn page, chief executive Dimitris Koutentakis named Y Combinator, Pantera Capital, Soma Capital, Seven Seven Six, Liquid 2 Ventures, Audacious Ventures and E14 Fund among its investors.

Koutentakis and Emile Germonpré, its chief technology officer, founded the company at MIT in 2026, and it is in Y Combinator's Summer 2026 batch. Its website describes standard platforms of 75 to 100 MW each, built in a shipyard and towed out to sea, with a campus growing barge by barge to as much as 450 MW; its LinkedIn page says the barges would be anchored 10 to 12 nautical miles offshore. Power comes from a vessel moored beside each campus, so the company says it can switch energy source without altering the data halls. It also claims seawater cooling with a PUE below 1.1.

Atomarine says it will start with gas: its website lists gas turbines now and marine reactors later, and its LinkedIn page says its nuclear power vessels are being developed in parallel. Its launch post on Y Combinator's site aims for a first gas-powered pilot by 2028 and says it already has early partnerships with offshore barge designers and builders and with several small modular reactor makers.

In his post, Koutentakis said that working offshore keeps the company from competing with local communities for land, power and water, that it has already built a working proof of concept, and that it is hiring engineers in naval architecture, nuclear engineering and data-centre design.