The Environmental Protection Agency developed a power profiler that : Determines your power grid region based on your ZIP code and electric utility, Compares the fuel mix and air emissions rates of the electricity in your region to the national average, and Determines the air emissions impacts of electricity use in your home or business. To start, all you need is a zip code, check it out . Hat tip
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Read the complete post at http://neinuclearnotes.blogspot.com/2008/08/how-clean-is-electricity-you-use.html