Dots versus watts: the data centre map counts listings, the EU counts power

A widely shared map puts 11,800 data centres on the world and 5,381 in the United States. A second directory, same country and same year, says 3,960. Neither publishes a definition, because both are counting commercial listings rather than buildings or megawatts. Since March 2024 the EU has run the only count with a legal definition behind it, and it reports energy rather than dots.

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A map of the world's data centres went round this week. 11,800 dots. The United States at 5,381 — 45.6% of the planet.

I went looking for what a dot is. Nobody says.

Data Center Map, published February 2026, counts 3,960 facilities in the United States. The chart says 5,381. Same country, same year, a 36% gap — 1,421 data centres that exist only as a difference in definition.

Before you blame sloppy counting: these directories are counting listings, and a listing is a commercial entity, not a building and not a megawatt. One hyperscale campus is one entry. So is a 40 kW cage in a telco basement. The map's shape is real. Its magnitudes are a unit nobody specified.

There is exactly one count of data centres with a legal definition behind it, and the EU built it:

  1. Delegated Regulation (EU) 2024/1364, in force since March 2024. Every site from 500 kW of installed IT power reports in.
  2. Not a headcount — 18 KPIs. Energy, water, waste heat reused, renewable share, plus PUE, WUE and Energy Reuse Factor.
  3. First aggregate, published this April: 776 facilities, 16.7 TWh, weighted average PUE 1.36, across 18 member states.
  4. Participation is incomplete and the Commission says so. A register that admits its gaps still beats a directory that never defined its unit.
  5. Germany went below the EU floor. The EnEfG threshold is 300 kW, reporting to the BfEE register by 31 March each year, PUE capped at 1.5 from July 2027 and 1.3 from 2030.

If you operate or rent above those thresholds, you are already in a register. Your PUE is a filed number, not an internal one.

The map shows who sells colocation. The register shows who burns power.

Which of those two is in your board deck?

#DataCenters #EnergyEfficiencyDirective #EnEfG #EUAIAct #Infrastructure

First comment

Sources, in the order I used them.

The directory behind the lower figure, and its own caveat that counts vary by methodology: https://www.visualcapitalist.com/mapped-countries-with-most-data-centers/

The underlying facility directory: https://www.datacentermap.com/datacenters/

The EU reporting obligation — scope, 500 kW threshold, deadlines, the full KPI list: https://www.eudca.org/energy-efficiency-directive

The delegated regulation itself: https://eur-lex.europa.eu/eli/reg/2024/1364/oj

The first aggregate release from the European database, where the 776 / 16.7 TWh / PUE 1.36 figures come from: https://www.datacenterdynamics.com/en/news/european-commission-releases-aggregate-eed-data-center-data-operators-report-64gw-of-installed-capacity-across-the-eu/

German thresholds, PUE caps and waste-heat percentages under the EnEfG: https://www.germandatacenters.com/news/detail/ueberblick-enefg-fuer-rechenzentren/

One point cut for length: that last source reports the EU aggregate capacity two ways, and the headline figure does not reconcile with its own energy total. 16.7 TWh at PUE 1.36 implies roughly 1.4 GW of average IT load, which fits installed capacity of about 6.4 GW at a normal utilisation and does not fit 64 GW at all. I used the facility count and the energy figure, which are unambiguous, and left the capacity number alone.

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