This document specifies power usage effectiveness (PUE) as a key performance indicator (KPI) to quantify the efficient use of energy.


This document:


a)       defines the PUE of a data centre;


b)       introduces PUE measurement categories;


c)        describes the relationship of this KPI to a data centre’s infrastructure, information technology equipment and information technology operations;


d)       defines the measurement, the calculation and the reporting of the parameter;


e)       provides information on the correct interpretation of the PUE.


PUE derivatives are described in Clause 9.