The Army issued a draft request for proposals today to purchase over a 30-year period $7 billion worth of power generated from alternative energy sources, including solar, wind, geothermal and biomass.

Katherine Hammock, assistant secretary of the Army for installations, energy and environment, announced plans for the project last year to support the service's goal of having installations produce more energy than they consume.

The Army Corps of Engineers' Engineering and Support Center in Huntsville, Ala., which is managing the procurement, said the alternative energy power generation plants will be located on or near federal property.

Hammond said last year that the Army would support their development by leasing land on installations, and the draft RFP backs this up with language that says the service endorses "the procurement of large scale renewable energy generated on or near Army land."