How do you measure a Datacentre’s Energy Efficiency?

The most common measure for energy efficiency in a datacentre is the ratio known as Power Usage Effectiveness (PUE). PUE is the ratio of the Total Amount of Energy used by datacentre divided by the amount of energy delivered to the servers and data function. PUE is a datacentre specific energy efficiency measure developed by the Green Grid. The ideal ratio for PUE is 1.0.

PUE = Total Facility Energy / IT Equipment Energy = 1 + Non-IT Faciliyy Energy / IT Equipment Energy.

PUE is the inverse of the Data Centre Infrastructure Efficiency (DCIE) measurement.

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How do you measure a Datacentre’s Energy Efficiency?