Create a route that passes by and through as many wind farms, solar installations, geothermal (if you are in CA, NV or Utah) as possible. You can catch a lot of wind in upstate New York and PA and still be in the vicinity of our urban areas. There is plenty of large scale solar going up in CA. You could do Colorado and hit Boulder "SmartGridCity", wind energy and solar sites as well as some of the companies that are building the infrastructure.