Naturally, attempts are underway to improve PUE as well. For instance, Robert Salvatore, director of Infrastructure Compliance and Green Initiatives at SunGard Availability Services, notes that “while PUE and DCiE continue to be the industry standard to measure energy efficiency, more-granular definitions of metrics like PUE are being proposed by non-profit groups such as The Green Grid.” Salvatore goes on to say, “A more detailed definition of PUE is on the horizon. The industry is currently starting to qualify different levels of PUE, which is described as either level 1 (basic), level 2 (intermediate), or level 3 (advanced). Each level is based on how the data was collected, the type of equipment that collected the data, the timeframe covered by the reported value and the frequency in which results were tracked.”

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