Data Centre PUE

Power Usage Effectiveness (PUE) is a metric used to determine the energy efficiency of a data centre. PUE is determined by dividing the amount of power entering a data centre by the power used to run the computer infrastructure within it. PUE is therefore expressed as a ratio, with efficiency improving as the quotient decreases toward 1.

PUE was created by members of the Green Grid, an industry group focused on data centre energy efficiency. Data Centre Infrastructure Efficiency (DCIE) is the reciprocal of PUE and is expressed as a percentage that improves as it approaches 100%.

How to Determine PUE

1. Take a measurement of energy use at or near the facility's utility meter. If the data centre is in a mixed-use facility or office building, take a measurement only at the meter that is powering the data centre. If it is not on a separate utility meter, estimate the amount of power being consumed by the non-data centre portion of the building and remove it from the equation.


2. Measure the IT equipment load after power conversion, switching, and conditioning is completed. According to The Green Grid, the most useful measurement point is at the output of the computer room power distribution units (PDUs). This measurement should represent the total power delivered to the server racks in the data centre.

According to the Uptime Institute, the typical data centre has an average PUE of 2.5. This means that for every 2.5 watts in at the utility meter, only one watt is delivered out to the IT load. Uptime estimates most facilities could achieve 1.6 PUE using the most efficient equipment and best practices.