The Fuel-Supply Gate
A single commercial burner would demand roughly 400 times the domestic helium-3 supply, so it is gated on a fuel that does not yet exist at terrestrial scale.
The fuel problem, quantified
The burner runs on deuterium and helium-3. Helium-3 is extraordinarily scarce on Earth: a single commercial burner unit would demand roughly 400 times the entire domestic supply. The machine is therefore gated on a fuel that simply does not exist at terrestrial scale — a physical supply fact, stated in the open.
Why this ties the two machines together
The fuel gate is the reason the breeder and burner are one program rather than two products. The breeder (Hyperion) is designed to produce about 1.97 kg/yr of helium-3 as one of its products, and a lunar helium-3 supply is part of the long-range picture. The burner cannot be fueled from existing terrestrial stocks; a bred and off-world supply is what the gate points toward. See the breeder paper.
A supply fact, never a price
- The gate is expressed as a ratio of demand to available supply — about 400x — not as a cost.
- It would remain true regardless of resources, because the material is not present in the needed quantity.
- It is why helium-3 is treated as strategically enabling rather than as something that can be bought today.
Why publish it
A generator with no fuel is not a working machine, and pretending otherwise would be the opposite of designing in the open. Stating the 400x gate explains, honestly, why the burner is a longer-horizon target and why the breeder's product mix matters to the whole program. See the full set at the honest gates.
The burner's fuel does not yet exist at the scale it needs. We put that number in the paper.