BS ISO/IEC 30134-3:2016+A1:2018a) defines the renewable energy factor (REF) of a data centre,b) specifies a methodology to calculate and to present the REF, andc) provides information on the correct interpretation of the REF.Cross References:ISO 8601ISO/IEC 30134-1ISO/IEC 13273-2:2015Incorporates the following:Amendment, August 2018