Three distinct measures
PUE relates total datacenter energy to IT equipment energy. WUE describes water use relative to energy, with a boundary to check in the source. REF here expresses a renewable-energy-related fraction; Google uses regional CFE data in this dataset.
Compare carefully
Check year, site, boundary and methodology before comparing regions. A provider-wide value may substitute for a regional value. Lower PUE alone does not establish a lower total footprint.
Dataset conventions
AWS keeps REF at zero by convention. Oracle notably uses a provisional zero WUE. These do not mean no renewable energy or no water use. Full assumptions are linked from the collection.