This Is How Much Energy It Takes to Legalize Weed

Marijuana growers in Denver are draining the city’s electricity supplies.

A worker cleans the lights in the vegetative room at Medicine Man in Denver. Kai-Huei Yau/ZUMA


This story was originally published by City Lab and is reproduced here as part of the Climate Desk collaboration.

Since states like California, Washington, and Colorado have adopted laws allowing for the legal growth and sale of marijuana, a new reefer madness has taken shape. In some areas, the bud industry has been credited for performing “economic miracles.” In others, it’s to blame for everything from pollution and deforestation to water shortages. And while it has been touted as a possible gateway to reducing racial arrest disparities, that has not been the case so far in Colorado.

Charge another social problem to the weed game: It’s getting too high on cities’ energy supply. At least that’s the case in Denver, where the recreational marijuana industry is reportedly sucking up more of the city’s electricity than it may have bargained for.

Colorado became the first state to legalize recreational weed use in 2012, and the commercial industry has grown exponentially ever since. But that blooming market has placed a huge burden on the grid that distributes electricity throughout the state, particularly in Denver, where the largest cluster of growing facilities exist. The city’s 354 weed-cultivation facilities sucked up 200 million kilowatts of electricity last year, up from 86 million at 351 facilities in 2012, according to the Denver Post.

That large jump still makes up less than 2 percent of the total electricity Denver consumes right now. But the city’s electricity use has been rising at a rate of 1.2 percent annually, with 45 percent of that increase due to marijuana-growing operations. The city, however, has little energy planning in place to account for what will be continuing effects due to the exploding growth of the pot market. Elizabeth Babcock, Denver’s manager of air, water, and climate told the Denver Post that city officials are not currently considering energy-efficiency rules for the weed industry.

Texas A&M University professor Gina S. Warren examined these problems nationally in a recent report published in the Columbia Environmental Law Journal. Writes Warren:  

“Indoor marijuana cultivation is highly energy-intensive. Overall, energy costs account for about one-third of the cost of production. With $6 billion in energy costs annually, marijuana cultivation is one of the most energy-intensive of the major industries in the United States. It consumes six-times as much energy as the pharmaceuticals industry and requires eight-times as much energy per square foot as the average US commercial building. It is estimated that marijuana currently consumes at least one percent of all of the nation’s electricity. And in California, which reportedly has the largest marijuana growing industry in the United States, consumption totals three percent of California’s total electricity consumption. The energy consumption is expected to grow exponentially as marijuana becomes legalized throughout the country.”

The volume of heat and light needed for growing quality cannabis plants accounts for much of the energy use. As Berkeley University researchers reported in 2013, lamp lights used for indoor-plant growing are 500 times more intense than standard reading lights and match the intensity of lamps used in hospital operating rooms. Another report found that the electricity used for a small hydroponic unit yielding just five pounds of cannabis crops a year would be the same amount as used by the average US home.

When Colorado’s recreational weed law first passed, Boulder County proposed a number of measures to push growers toward using renewable energy—important given the state’s plans to comply with EPA’s Clean Power Plan. The county originally told commercial and medical weed growers that they had until October 22, 2014, to find a way to offset at least 51 percent of their power consumption with on-site renewable energy generation, with the expectation for them to make all energy use renewable by this October.

That plan was reconsidered, though, when everyone realized there wasn’t enough renewable energy supply in the state to absorb the impact of the pot industry’s usage. So, the county created another compliance method: a fee of 2.16 cents per kilowatt hour, which is used for the Boulder County Energy Impact Offset Fund, which is set up to offset fossil fuel consumption. Problems still remain, though, both in terms of energy use and climate change implications. As Warren noted in her report:

“Connecting to the existing national energy delivery system and utilizing energy efficiency programs and innovation are great opportunities to lessen some of marijuana’s carbon footprint, but it will do little to offset the millions of metric tons of carbon dioxide that the industry has emitted and will continue to emit.”

Which is why Warren implores that, as more cities and states legalize pot, expanding the market in the process, that electricity use is regulated upfront with indoor growers urged to rely on renewable energy sources. As it is, weed-business owners doesn’t need any more reasons for certain policymakers to call for lights out on the industry.

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WHO DOESN’T LOVE A POSITIVE STORY—OR TWO?

“Great journalism really does make a difference in this world: it can even save kids.”

That’s what a civil rights lawyer wrote to Julia Lurie, the day after her major investigation into a psychiatric hospital chain that uses foster children as “cash cows” published, letting her know he was using her findings that same day in a hearing to keep a child out of one of the facilities we investigated.

That’s awesome. As is the fact that Julia, who spent a full year reporting this challenging story, promptly heard from a Senate committee that will use her work in their own investigation of Universal Health Services. There’s no doubt her revelations will continue to have a big impact in the months and years to come.

Like another story about Mother Jones’ real-world impact.

This one, a multiyear investigation, published in 2021, exposed conditions in sugar work camps in the Dominican Republic owned by Central Romana—the conglomerate behind brands like C&H and Domino, whose product ends up in our Hershey bars and other sweets. A year ago, the Biden administration banned sugar imports from Central Romana. And just recently, we learned of a previously undisclosed investigation from the Department of Homeland Security, looking into working conditions at Central Romana. How big of a deal is this?

“This could be the first time a corporation would be held criminally liable for forced labor in their own supply chains,” according to a retired special agent we talked to.

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And it is only because Mother Jones is funded primarily by donations from readers that we can mount ambitious, yearlong—or more—investigations like these two stories that are making waves.

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