There is a trend across the USA to make the football, baseball, basketball and hockey stadiums more energy self sufficiant. The Philidalphia Eagles will have the first major stadium where all the energy is generated on site. They will use a combination of solar, wind, biodisel and low flush toliets. Read this article. http://www.nytimes.com/2010/11/18/sports/football/18stadium.html?_r=1
The Green Getting Excited About Science shows uses only electricity generated by the 300 watt energy bike and solar panels.