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Cloud providers are keen to tout their Green credentials, but energy efficiency must balance against demand and clean energy in order to achieve sustainability
* Clean Energy Index and Coal Intensity are calculated based on estimates of power demand for evaluated facilities — see http://www.greenpeace.org/cloudcomputingfacilities
** AWS was provided facility power demand estimates to review. AWS responded they were not correct, but did not provide alternative estimates. Using conservative calculations, Greenpeace has used the best information available to derive power demand, and have decided to publish and invite AWS to be transparent and provide more accurate data for their facility power demand.
*** Google was provided facility power demand estimates to review, and indicated they substantially exceeded Google’s current electricity demand, but did not make additional information available. Given that these estimates are based on maximum power of each facility, and not estimates of current use, we elected to publish and invite Google to provide current data on energy footprint and carbon consumption.