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This category in: USA: Minnesota: Minneapolis-Saint Paul Region
 Energy
Great River Energy
(Elk River)
http://www.greatriverenergy.com/
SolarAttic, Inc.
(Elk River)
SolarAttic's new alternative energy technology uses the solar heat inside of attics for heating hot water, swimming pools and space. New ventilation technology uses a patented duct to vent the attic.
http://www.solarattic.com/
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