Near-Zero Water Use

Because direct conversion replaces the steam cycle, the burner needs almost no cooling water — the property that unlocks siting beside data centers.

No steam cycle, little water

A conventional power plant — fission, coal, gas combined-cycle, and most fusion concepts — makes heat, boils water, and rejects the waste heat of the thermodynamic cycle, usually by evaporating large volumes of cooling water. The burner does not run its main power through a steam cycle. Most of its output is charged-particle energy converted directly to electricity by the direct converter, so the dominant reason plants consume water simply is not present.

Where the difference comes from

• Charged-particle power (about 94.56%) is converted electrically, not thermally
• No large condenser rejecting turbine exhaust heat to cooling water
• Only the small neutron and radiation heat needs cooling — see waste heat
• Residual cooling can often be dry (air) rather than evaporative

Why it matters

Water availability is one of the hardest siting constraints for large loads. A machine that does not need a river, a cooling-tower field, or a big evaporative draw can be placed where the electricity is used — inside cities and on data-center campuses — rather than only where water is abundant. This near-waterless character, a direct consequence of the aneutronic-dominant fuel and direct conversion, is central to the MetroVolt case.

Near-zero is not exactly zero: the neutron and radiation channels still make some heat that must be rejected, and auxiliary systems use small amounts of water. But the order-of-magnitude reduction versus a steam plant is real and follows directly from the physics.