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This session from the 2010 Technical Forum reviews ongoing work within The Green Grid and select national labs on developing a metric for measuring the benefit of reusing excess or waste energy from the data center.Power Usage Effectiveness (PUE) is the industry-standard metric for data center infrastructure, and on occasion, there are reported values of less than 1.0, claiming to be taking credit for that energy re-use. This is an incorrect use of the PUE metric. The Green Grid will present a new metric that properly accounts for this beneficial reuse. The presentation will look at the theory of the metric including when it should and should not be used, the math behind it, as well as interesting case studies where it can be applied.