LUNAR BRANCH

The Problem

Every credible lunar base architecture requires a heat source to drive ISRU. None of them fund that heat source with revenue generated on the surface.

The Heat Source Gap

Water extraction at the lunar pole requires thermal energy: to sublimate ice, drive electrolysis, maintain equipment above operational minimums, and power organic Rankine cycle generation during eclipse. The published field offers four categories of heat source:

  • RTG (Lunar Ice Miner, ICES-2022-130): radioisotope cost and supply constrain scale.
  • Fission Surface Power (NASA FSP, 40 kWe target 2030): not flight-ready before ~2030; nuclear launch approvals are a separate regulatory track.
  • Solar concentrator (Sowers and Dreyer, New Space 2019): large optical aperture, mechanically complex.
  • Generic crew-base equipment: agency-funded, no independent revenue mechanism.

A heat source funded by independent commercial revenue does not appear in the published literature. No credible lunar-base program carries a self-funded surface revenue mechanism.

The Radiation Risk

Placing commercial GPU hardware on the lunar surface introduces a second gap: the polar radiation environment is not well characterized for commercial silicon. The Connecting Ridge sits outside Earth's magnetospheric protection. Galactic cosmic rays and solar energetic particle events present a soft-error and latch-up risk that rad-hard silicon avoids at a cost that kills the economics.

Centradiant's position: ECC memory, lockstep execution, hardware watchdogs, and a 50 cm regolith berm provide adequate protection for commercial GPUs. That claim requires a quantified fault model anchored to real polar data, not orbital proxies. That is what Cosmo Regulus provides.

What Fills the Gap

A GPU compute facility at 500 kW installed generates waste heat at 90 °C continuously. That heat drives the ISRU cascade: water extraction at an estimated 1.2 tonnes per day, ORC power during eclipse, and regolith thermal energy storage for thermal buffering. Compute revenue, not agency grants, funds the heat source.

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