The Green Grid -- the consortium that developed the Power Usage Effectiveness, or PUE, metric for measuring energy efficiency in data centers -- announced earlier this month that it is developing two more metrics that address carbon emissions and water usage.
The newly released Carbon Usage Effectiveness, or CUE, metric is intended to help IT managers measure greenhouse gas emissions from the IT gear in a data center, said Larry Vertal, executive director of The Green Grid.
The first version of CUE includes the direct emissions of the data center, primarily from backup power generators, and the emissions of the power utility, Vertal said. A future version will include "everything else," such as the emissions of the mining and manufacturing operations that supply fuel and equipment to the power utility, he said.
A third metric, Water Usage Effectiveness, or WUE, will be released by next March. WUE will determine the amount of water used by the facility and the efficiency of that usage in IT operations.
The widely adopted PUE metric measures how much of the electricity used by a data center goes to the IT equipment as opposed to being lost on cooling systems or inefficient power supplies.