If you read the findings, it's basically a 3 page "case study" (i.e. advert), the last page of which is a screenshot of "TSO Logic" - which claims to solve this. One reference is from 2008 and another is TSO Logic's own data.
There probably is wastage, though it would nice to see a proper, modern, scientific study on this though.
Originally I submitted Computerworld story [1], which is a summary of a few studies (including NRDC's), but that submission's url got changed to pdf, and today I got mod-email that it's "a good story to repost", so I posted announcement this time.
There probably is wastage, though it would nice to see a proper, modern, scientific study on this though.