The Rocky Mountain Institute has published an interactive map that shows each states efficiency and opportunities to improve that. A simple measure of GDP/khw is used for the base calculation.
This echoes similar studies that have shown Ohio as having huge room to improve on it's carbon reduction.
However it does beg the question, how good of a measurement of gdp/khw? Banking makes more money than farming and uses less energy. I think there is some validity in the overall picture it paints, but is by no means hard science.
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