Equinix has recently adopted more aggressive regional PUE design targets for new sites as well as major expansions. These targets are based on an Average Annual PUE at full load (with redundancy) that meets the definition for PUE Category 3. Our current targets range from 1.29-1.40 and represent an average incremental efficiency gain of 8-10%. For existing sites, Equinix is striving to report PUE Category 1 with IT load readings in kWh taken at the output of the UPS and measured as an annual average.
Power usage effectiveness (PUE) is an important industry metric for measuring the energy efficiency of a data centre’s infrastructure under normal operating conditions. It is calculated using the following formula:
Energy use beyond what's consumed by IT equipment powers essential data centre services such as cooling, lighting, power distribution and power conversion.
PUE helps track power usage trends in an individual facility over time and measures the effects of different design and operational decisions. It is best used as a facility-specific benchmark, not a numeric basis for comparing different data centres. PUE is affected by site-specific variables, including:
Equinix is committed to lowering our PUE through a mix of capital investments, improved design standards, best practices and operational discipline. By maximising environmental and ambient conditions where possible (such as by using fresh air cooling), we expect to lower our PUE even more.