Chicago Generates Twice the Energy for a Third of the Carbon

When generating electricity, roughly two-thirds of the energy is lost. Heat is created as a byproduct to spin turbines and later wastes away in cooling towers. Chicago has committed to produce 1.5 billion kilowatt hours of electricity by 2010 with a process call combined heat and power or cogeneration, which finds use for the generated heat. This process can be over 90% efficient.