Here is an interesting article on recovering waste heat from power
generation plants: http://www.enn.com/top_stories/article/25399
"According to Sean Casten, president and CEO of RED, the United States
could conceivably continue producing the same amount of energy it does
now, with half the fossil fuel, by recycling the waste heat from its
factories and electric generating stations."
School of Forest Resources & Conservation
University of Florida