Colorado pot grows used as much energy as 35,000 homes in 2014

Robert Grandt works in the grow room at 3D Cannabis Center in Denver, March 11, 2015.

Robert Grandt works in the grow room at 3D Cannabis Center in Denver, March 11, 2015. (RJ Sangosti, The Denver Post)

Pot’s not green.

The $3.5 billion U.S. cannabis market is emerging as one of the nation’s most power-hungry industries, with the 24-hour demands of thousands of indoor growing sites taxing aging electricity grids and unraveling hard-earned gains in energy conservation.

Without design standards or efficient equipment, the facilities in the 23 states where marijuana is legal are…

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