At Operational Intelligence we believe the data centre industry is starting to recognise that its focus must go beyond energy consumption. Single-issue metrics such as PUE only consider the operational phase, omitting impacts from other issues and during other stages a facilities lifetime. No single-metric has the capacity to capture fully the interlinked nature of the data centre system. Using single metrics is dangerous as improvement in one area can adversely affect a totally different area with the operator remaining oblivious. Using operational efficiency as a proxy for sustainability has to stop. Beth’s Whiteheads publication explains exactly why.