Atomarine

Atomarine designs floating compute barges paired with separate power ships, initially fuel-generated and ultimately marine small modular reactors, with seawater as the heat sink. The pitch is shipyard-manufactured standardised platforms deployed away from congested grids and contested land. It entered Y Combinator's Summer 2026 batch with early offshore designs and SMR partnerships, and has no operating barge or marine nuclear system.

Ecosystem functionThe only company trying to marry floating data centers to marine nuclear rather than shore grids or intermittent renewables, which is either the category's endgame or its longest shot.

Business modelFloating nuclear-powered data centers