HEARTHCube is a sovereign, off-grid AI data centre engineered into two forty-foot ISO containers. It is designed to generate its own electricity, recover and reuse heat through a five-stage cascade, and keep customer data inside the deployment boundary.
Configured for approximately 131 petaFLOPs of sparse FP8 performance in a single-phase dielectric immersion bath rather than blown air. Dense, quiet and thermally efficient by design.
A Convion C60 solid-oxide fuel cell feeding ORC turbines, with hybrid vanadium-flow and sodium-ion storage, a phase-change thermal buffer, and the five-stage cascade. It generates; it does not merely distribute.
A conventional facility makes heat once and vents it. HEARTHCube runs that heat down a five-stage cascade, each stage claiming what the last could not use, until more than ninety-five percent of it has done real work before anything is released.
Fuel-cell exhaust is the hottest headwater. ORC turbines turn grade-A heat back into electricity for the compute.
Mid-grade heat drives cooling and process loads. District hot water warms buildings and neighbourhoods at tariff.
The last usable warmth: greenhouses, pre-heat, snow-melt. Only then is anything released.
The honest physics, stated first. HEARTHCube does not break the second law of thermodynamics and never claims to. It extracts far more useful work, exergy, from each unit of fuel before the remainder is released. The advance is in what we capture, not in physics repealed.
Unit One is not yet built. We say so plainly, and every figure we publish is labelled as modelled or measured.