Off-grid by design

A data centre that does not wait for the grid.

HEARTHCube is sovereign AI infrastructure engineered around its own onsite power plant. Designed for islanded operation, it can run without a utility grid interconnection, keep customer data inside the deployment boundary, and recover waste heat through a five-stage cascade.

No grid interconnection required by design. Off-grid removes grid-connection dependency; it does not remove site, fuel, safety, environmental or other applicable permitting.

Bring the power. Skip the grid wait.

For conventional data centres, speed-to-power is often controlled by utility capacity, interconnection studies and network upgrades. HEARTHCube changes the dependency: the generation travels with the compute.

Islanded operation

The machine is designed to operate without drawing its primary power from the utility grid.

No utility interconnection prerequisite

A grid connection is not required for the core system to run, removing interconnection studies and utility upgrade timing from the operating critical path.

Regulatory scope shifts

Off-grid operation can eliminate grid-specific approvals from the deployment path. The project still must satisfy applicable local, state and federal requirements for siting, fuel, safety, emissions, buildings and data.

Two containers, one organism.

Container Alpha

The compute

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.

Container Bravo

The power plant

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.

~131 PF/s

Configured sparse FP8 compute

>95%

Modelled waste-heat recovery

72 hrs

Target site-to-operation

Zero

Grid interconnection required by design

The same heat, spent five times.

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.

Stages one and two

Fuel-cell exhaust is the hottest headwater. ORC turbines turn grade-A heat back into electricity for the compute.

Stages three and four

Mid-grade heat drives cooling and process loads. District hot water warms buildings and neighbourhoods at tariff.

Stage five

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.

Where shared facilities are untenable.

Grid-constrained enterprise. Capital ready and compute demand real, but utility capacity, network upgrades or interconnection timing stand in the way.
Regulated healthcare. Workloads with privacy, governance or resilience requirements that favour dedicated on-premises infrastructure.
Defence and federal. Designed for sovereign and air-gapped deployment pathways where policy, contract or mission requirements demand tighter control.
Remote and off-grid sites. Where there is no reliable grid to wait for at all.

Where things honestly stand

Architecture complete Independently reviewed Six patent filings CAGE · SAM.gov registered Federal briefs submitted Investor discussions active

Unit One is not yet built. We say so plainly, and every figure we publish is labelled as modelled or measured.