too much electricity. grassroots support say quality comes first. here s the story from denver. we have to recreate the fund to get marijuana plants to flower indoors. this 12,000 square foot grow house brings big money but a $10,000 electric bill. lights like these are used for legalized marijuana. not all grow indoor but enough do to rack up $6 billion each year in energy costs. the city of denver warned the electric demands of cultivation facilities can lead to grid outages. boulder county was so concerned it installed energy monitors and charges a voluntary hourly fee. it s something we have been seeing across the country.