I've been asked by a client to try to put together a working group of utilities, IT equipment distributors, and program managers to offer a rebate program for EnergyStar servers.
Nominally the effort will look very much like the program for EnergyStar desktops and monitors offered by five utilities on the west coast, including three in California (PG&E, SMUD, and SDG&E). That program is moving something less than a million dollars a year in incentives, but by all accounts has the strong support of the participating distributors (after a period of some skepticism).
There are a number of roadblocks on the path to success, including the fact that server makers have not yet made the effort to certify many, if any, of their products.
I'm building a stakeholders list now, with the intent of holding a program planning "summit" in Q3. If you're interested or would like to participate, let me know.