Although indoor pot growers should be aware that their plants consume the electricity needed to power 2 million average-sized homes, I don’t think they care. Indeed, a study conducted at the LBNL (Lawrence Berkeley National Laboratory) shows that those who grow marijuana indoor represent about 1% of the energy consumed in the US – which is much.
Of course, marijuana isn’t only produced for illegal purposes, but also for medicinal use. The growers use high-intensity lights, 500 times more powerful than a standard reading lamp, according to the NY Times. Their overall price tag reaches $5 billion yearly, and makes the classic pot cigarette emit 2 pounds of CO2 (from a dust-to-dust analysis’ perspective). The study also says that the emissions are the equivalent of 3 million cars.
“The added electricity use [to an average home] is equivalent to running about 30 refrigerators,” said researcher Evan Mills, who conducted the study. “Processed cannabis results in 3,000 times its weight in CO2 emissions. For off-grid production, it requires 70 gallons of diesel fuel to produce one indoor cannabis plant, or 140 gallons with smaller, less-efficient gasoline generators.”
Mills concluded that by enhancing the production methods so that their efficiency reaches 75%, people will be able to save up to $25,000 a year for a 10-module growing room. He also mentioned that his information has been gathered from publicly-available sources and interviews with horticultural equipment retailers.