Mexico City puts a clock on data centre power

The permitting queue had become the whole argument. Operators wanted certainty about connection dates; the grid operator wanted certainty about peak demand; residents wanted certainty that neither would be resolved at their expense. The compromise moves the fight from whether to when.

The condition

New connections above a threshold are approved with a curtailment obligation: a defined number of hours per year during which the site runs on its own generation or reduces draw. In exchange, the connection date is guaranteed.

That trade is the entire policy. A guaranteed date is worth a great deal to an operator financing a build; a guaranteed reduction during peak hours is worth a great deal to a system operator planning capacity.

Firm power is expensive. Flexible power is available now.

Why operators accepted

Most large sites already hold backup generation and already shed non-urgent workloads — batch processing, model training, internal analytics — when prices spike. The obligation formalises something the better-run operators do anyway.

It also converts an open-ended planning risk into a schedulable cost. An operator can price ninety hours a year of curtailment. It cannot price an eighteen-month delay of unknown length.

The firms that objected were the smaller colocation providers, whose tenants hold the workloads and whose contracts do not give them the right to shed anything.

The part still contested

Water, not electricity.

The permits say little about cooling withdrawals, and the aquifer is the constraint residents raise first — in a city with a documented subsidence problem and intermittent supply in several boroughs. A separate consultation has been promised, which is the usual way a difficult question is deferred rather than answered.

The operators’ position is that closed-loop cooling makes the question moot. The hydrologists’ position is that closed-loop systems still require make-up water and that nobody is metering it.

What to watch

Watch the published curtailment hours against actual events, since an obligation never invoked is a concession that cost nothing. Watch whether the threshold is revised downward as more sites connect. And watch whether the water consultation is scheduled before the next permitting round or after it.