greenButton.de
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http://www.greenbuttondata.org/
http://energy.gov/data/green-button
http://en.openei.org/wiki/Green_Button
http://www.greenbuttonconnect.com/
http://www.verbatim.de/de/article/green-button-energy-saving/?con=24
http://www.thegreenbutton.tv/forums/
http://www.duisburg.de/micro2/umwelt/