I am one of the community managers of this forum and work at the GIZ.
Will this work?
A sewage-powered data center?
Well in an article by James Murray Published November 26, 2012, this is precisely what Microsoft is investigating.
Microsoft to debut sewage-powered data center
With the world's leading IT companies rushing to develop renewable energy projects to power their giant data centers, Microsoft might be about to take the prize for the most unlikely clean power source – sewage.
U.S. firm FuelCell Energy this week revealed it is working with the IT giant on a trial that could see biogas from a wastewater treatment facility in Wyoming utilized by a fuel cell, providing "ultra-clean and carbon-neutral electricity" to a Microsoft data center.