Cheap power can make a drink

Desalination means taking the salt out of water so people can drink it. The usual machine in 2026 is reverse osmosis: pumps push seawater against a very fine membrane. Salt stays on one side. Fresh water comes through the other.

Energy is a large part of the bill, often thirty to fifty percent of the cost of each cubic metre. A cubic metre is a thousand litres, about what a careful small family uses in two days.

Modern seawater plants with energy recovery use about 2.5 to 4 kilowatt-hours per cubic metre. Physics says you cannot go below about 1. In 2026 Dubai is finishing Hassyan, a large plant run on cheap daytime power and aimed at 2.9. A smaller plant in Gran Canaria measured 1.8 in 2025.

This is not a fridge that must run after dark. It is work you can do while the sun is up and store as water, not as electricity. Cheap noon hours are a tool. A drink is a job.

The tempting mistake is to think cheap power is only for lights and fridges.

That is what lets you hear the limits without giving up the cup.