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[E-impact] How-to calculate datacenter consumption?

Sébastien Rumley <sebastien.rumley@hefr.ch> Fri, 27 June 2025 21:06 UTC

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Subject: [E-impact] How-to calculate datacenter consumption?
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Hi list,

I have a little simple methodological question to ask.

Let's take one datacente, or one site, typically Vantage "Zurich I" : 
https://vantage-dc.com/data-center-locations/emea/zurich-i-switzerland/

The announced critical load is 40MW.

How much is this guy sucking from the grid ?

I have seen a study that applied the following methodology :

40MW * 0.7 (usage factor) * 1.15 (PUE) = 32.2 MW.    32.2 MW * 365 * 24 
= 282 GWh.

Is that correct ?


I am questioning :

- the principle of applying the PUE afterwards, is the "critical load" 
facing the servers ? Or facing the grid ?

- the usage factor. 0.7 seems quite high, especially when considered 
yearly average..

Any clues ?

Sébastien


-- 
Dr. Sébastien RUMLEY, Professor
iCoSys Institute, part of
HEIA-FR - School of Engineering and Architecture - Fribourg, part of
HES-SO - University of Applied Sciences and Arts Western Switzerland

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