PUE: The Number Everyone Quotes

One number dominates every data centre conversation: PUE, power usage effectiveness. It appears in tenders, sustainability reports, planning applications and marketing decks, and it is genuinely useful, which is precisely why it is so widely gamed. An energy professional in this sector needs to be able to compute PUE properly, place a figure against the market honestly, and, most importantly, name the three ways the industry's favourite metric flatters a facility without a single kilowatt-hour being saved. This lesson does all three.