Pieza independiente

Water draws the map

Movement 2 · The Metabolism — September 2026

I The resource nobody puts in the deck

A compute hall is cooled in one of two ways. With electricity, spending more energy to move air and liquid, or with water, letting it evaporate and carry the heat away with it.

The first option makes your stated efficiency worse. The second consumes a resource that has an owner, a catchment, a season and neighbours.

So the map of this industry is not drawn by the models: it is drawn by hydrology, and the fight is settled in council meetings whose agenda is about flow rates and not about artificial intelligence.

The only human being in the whole system with the legal power to stop a hall lives ten kilometres from it and does not work in tech.

“A catchment does not sign non-disclosure agreements.”

II Two efficiencies that do not add up

Metric	What it measures	How you improve it	At the cost of
PUE	total energy against compute energy	cooling by evaporation	more water
WUE	litres per kilowatt-hour	cooling in a closed loop	more energy

A fleet averaging a PUE near one point zero nine is a feat of engineering and also a partial statement. Counting the electricity without counting the litres measures half the metabolism.

An operator can boast both figures at once, as long as it does not say where each one was achieved. A fleet average is an average over very different sites [one in a cold climate and one in a dust bowl count the same].

III What got signed this year

In September 2026 a geothermal contract for three hundred and ninety-six megawatts was signed to feed data centres. It is the class of agreement that carries the most weight on the whole board, because it does not promise capacity: it obliges you to deliver energy, with a penalty.

Advanced geothermal has a political property that nuclear does not have and solar does not either. It is firm, it takes up little room, and it needs subsurface, water and a drilling permit. It moves the conflict from the land to the layer underneath, where the rights are older and worse documented. The well is not visible from the road; the file is, and it carries a date.

IV How to read a site [safe]

01

Find the catchment before you find the company. Name of the river or the aquifer, and the state of the reserve.
02

Work out the drought record of the last ten years; the good years decide nothing.
03

Locate the abstraction permit and the discharge permit. There are two, and they are usually processed separately.
04

Look at the authorised discharge temperature. That is where you see whether the project was counting on evaporating or on giving back.
05

Write down the date of the council meeting. It is the only point in the process with an audience.

V Risks

The temptation is to turn this into a denunciation and feel better. It comes cheap, because water hands you an instant moral argument and because nobody is going to answer back from the far bank.

Resist it for a practical reason. A town negotiating flow rates with an operator has more power than one denouncing the whole system, and it has that power now, with a specific file and a consultation period that closes on a Thursday.

There is an asymmetry working in the neighbour's favour and it is almost never used. The operator needs the permit before a date [the campus handover is already committed in a contract] and the council needs nothing before any date at all.