The Environmental Protection Agency in August asked server manufacturers to develop "miles per gallon" ratings for their equipment that would provide users with accurate assessments of energy efficiency. IBM on Thursday announced that it would begin providing typical usage ratings for its line of z9 mainframe computers..

The usage ratings were developed using data collected from more than 1,000 z9s deployed to customers since May 11 when IBM added a "mainframe gas gauge" feature to the computers that monitors energy usage and cooling statistics. As a result, IBM has found that typical energy use by the systems is normally 60 percent less than the maximum ratings.

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