I guess hydro power projects with mining facilitates can be best shot in this one. I am working on a project called as SAM, where these guys have created a cubes which are in built with graphic unit miners. These cubes are also placed in Alps county where the temp is always in minus so no need maintain the temp.
How they are going to deliver the energy to these so called SAM cubes ? Well they are going to set up their own hydro power projects and solely be available for the SAM cubes mining only. I guess this is one of the best shot for producing environment friendly model of mining equipments. Its more or less self sustaining stuff.