Apple: Greenpeace’s Cloud Math is Busted » Data Center Knowledge: “Apple says it will use 20 megawatts of power at full capacity in its North Carolina data center, about one-fifth the amount estimated by Greenpeace in a report that is sharply critical of Apple and other data center operators for relying upon “dirty” energy sources to power their cloud computing operations.
Apple’s statement raises questions about the credibility of the estimates in the Greenpeace report, and illustrates the difficulty of seeking to estimate data center power usage – a detail that many companies are unwilling to disclose on their own.”