Power usage effectiveness (PUE)
The ratio of a data center's total power draw to the power reaching its computing equipment, and the standard efficiency measure.
Power usage effectiveness divides a facility's total energy consumption by the energy delivered to its IT equipment. A value of 1.0 would mean every watt entering the building reaches a server; everything above that is cooling, power conversion, lighting and losses. It is the industry's common efficiency measure and it is deliberately simple.
That simplicity is also its limit. PUE says nothing about how much useful work the IT load performs, nothing about water consumption, and nothing about the carbon content of the supply - and it improves automatically as IT load rises, which means a well-utilised inefficient facility can report a better figure than a lightly loaded efficient one. It is a ratio, not a verdict.
For supply purposes it matters because it converts a compute figure into a grid figure. A campus specified in IT megawatts draws meaningfully more at the substation, and that difference is what the interconnection queue and the wet-bulb temperature at the site are actually sized against.
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