what is the energy cost to dry cannabis

The Environmental Implications of Energy Consumption in Cannabis Tillage

What are the environmental implications of energy consumption for outdoor, indoor, and greenhouse cultivation?

With a rapidly evolving body of peer-reviewed studies examining the phytochemical content and therapeutic efficacy of cannabis, the momentum of this new frontier of medicine continues to gain legitimacy while simultaneously destabilizing the negative stigmas that accept persisted for well-nigh a century. Notwithstanding, with the emergence of this relatively new enterprise that is legal cannabis cultivation, comes justifiable concerns almost sustainability and environmental stewardship. Similar any other establish crop, cannabis requires growth media (air, soil, or water), water, nutrients, and light. And while issues pertaining to soil contamination and water use are certainly salient points to be made in cannabis cultivation; the primary gripe held by concerned citizens, regulators, and permitting departments revolves effectually energy consumption. In this commentary, we talk over the environmental implications of free energy consumption for outdoor, indoor, and greenhouse cultivation to highlight new technologies and best management practices that are being utilized to produce world-class medicine while minimizing one'southward carbon footprint.

Outdoor Cultivation

Growing cannabis in an outdoor setting has a number of benefits, besides every bit several drawbacks. In almost cases outdoor cultivation allows 1 to take advantage of rural h2o sources and land, likewise every bit natural sunlight. Collectively, these attributes allow operators to lower their initial capital expenditures (CAPEX) while likewise reducing their cultivation price per gram of finished cannabis (operational expenditures or OPEX). Also, natural sunlight is ostensibly the spectrum that the well-established McCree curve is predicated on, which outlines the relative intensity of unlike light spectra that plants utilize for photosynthesis (400–700 nm). This spectra, and now an extended version of the McCree Curve including light outside the homo visual range, is known equally photosynthetically usable radiations (PUR). In our previous article, we discussed this and some of the latest lighting metrics that are designed to quantify photon delivery within this range (1). However, the primary drawback from growing cannabis outdoors is the susceptibility to the elements of the natural earth. Producing outdoor cannabis in a cost-effective manner is desirable, until ane has to deal with desperate changes in temperature, humidity, and precipitation. In addition to extreme weather events, which are occurring more ofttimes with greater intensity, outdoor cultivation can likewise be negatively impacted by highly variable fluctuations of pests, and the possibility of unwanted pollination by rogue pollen from neighboring farms. This latter point certainly doesn't get enough attention, only information technology is one of the major driving forces for those looking to produce the highest quality cannabis, who ultimately find themselves operating indoors or in greenhouses. Another catalyst in this shift is article pricing. Outdoor cannabis generally does not command the same price per pound that greenhouse-grown or indoor cannabis does, primarily considering of the lighting placement, custom spectrum application, and precisely controlled ecology factors that can be implemented within these forms of control surround agriculture (CEA), which mutually drive greater expression of phytochemical and potency elements.

Overall, outdoor cannabis cultivation requires little or no energy consumption, which makes information technology the least intrusive cultivation modality, from an environmental perspective, with the smallest carbon footprint. Nevertheless, the uncontrollable aspects of outdoor cultivation call into question the sustainability of this practice over time. As the cannabis manufacture continues to grow, so too will the number of growers looking to operate an outdoor farm, which may ultimately upshot in more than undesirable pollination events or a more than abundant and diverse biota of pests that one may have to business relationship for. In addition, waste past-products will increase significantly and the disposal of unsold outdoor cannabis volition become problematic.

Indoor Cultivation

Taking into account some of the same drawbacks of outdoor cultivation, bringing the grow indoors allows one to reap the benefits of CEA: control and consistency. Not merely tin can temperature, humidity, and hygiene be improve regulated indoors, but so also can the spectrum and distribution of calorie-free. The most common lighting used in CEA has been high intensity discharge (HID) lighting, such as metal halide (MH) and high pressure sodium (HPS). Unfortunately, these lighting technologies do not emulate the spectrum of the sun very well and they are extremely inefficient at transforming Watts into light in the correct spectra. As much as 95% of the power used by an HPS lamp produces output at 850 nm, which is felt every bit heat and has little known do good to plants. More waste material heat equates to larger heating, ventilation, and air conditioning (HVAC) requirement to maintain climate control, which ultimately results in large electric bills and a more substantial carbon footprint. Alternatively, many full-spectrum calorie-free emitting diodes (LEDs) provide a comprehensive spectrum that is much more representative of the sun and demonstrates a much greater efficiency (24–28%) compared to HID lighting (five–10%). This, coupled with the highly directional nature of LED lighting is the reason that you lot may hear the anecdote that 600 W from an LED abound light is the equivalent of, or provides the same photon density on the awning, as a 1000 W HPS grow low-cal.

Using the instance of a 10,000-foursquare-foot indoor cultivation facility where eighty% of the flooring space is occupied by canopy (8000 sq. ft.), the differences in electrical consumption, carbon footprint, and waste matter heat production are quite substantial when comparing full-spectrum LEDs to HPS lights (Tabular array I).

What Table I illustrates is that financial efficiency and environmental stewardship are not mutually exclusive and in fact can go hand-in-manus. Not only would the employ of LEDs over HPS lights reduce CO₂ emissions past 12,469 tons over 10 years in this hypothetical scenario, but this would also result in a $ane,841,495 cost saving on the electrical and HVAC aspects of the operation. These results are substantial, particularly when considering the differences within the context of an individual state ecosystem. For instance, California reports that 3% of ability consumption in that land is attributable to indoor cannabis grows—the equivalent of powering 1 meg homes, while Colorado attributes half of its power load growth since 2012 to cannabis grown indoors (3). Many power companies are concerned, not just about increased load due to cannabis grows, but touch on on electrical grid infrastructure. Stories of filigree impact due to grow operations have been abundant since state's legalization and recently, cannabis grow houses triggered seven rolling blackouts in the Pacific Northwest due to excessive transformer loading (4). Looking through a broader lens, a 2012 report revealed that indoor and mixed lite (greenhouse) cultivation in the United States consumed approximately 20 TWh of electricity annually, which is equivalent to the energy consumption of the entire US agricultural sector, leading to an annual emission of fifteen,000,000 Mt of CO2 (5,half dozen). These values provide considerable insight into the calibration of energy consumption in the cannabis industry in general and provide an impetus for greater adoption of energy-efficient technologies such as LEDs, as has been mandated in states like California.

Greenhouse Cultivation

Greenhouse tillage is a middle-of-the-road approach that allows ane to capitalize on the benefits of natural sunlight while also taking reward of the photon delivery and spectral outputs that come with supplemental lighting. Using daily light integrals (DLI), which quantify the number of photosynthetically active photons that accrue in a square meter over the course of a 24-hour interval, 1 can modulate their supplemental lighting to evangelize the appropriate amount of cumulative photon density while minimizing their electrical consumption. In some cases DLI tin be integrated into the greenhouse lighting fixtures automatically and then that more supplement light is delivered on shorter, darker days, and conversely, less low-cal is delivered on longer, more luminous days. Compared to indoor cultivation, which is devoid of natural sunlight, the inclusion of HID or LED lighting into a greenhouse every bit a supplement means that relatively less lighting units are utilized, which ultimately results in less energy consumption (and grid load) to ability the fewer lights and remove less unwanted heat. For example, while 1000 West of full-spectrum LED lighting may cover 16–xx sq. ft. of indoor canopy space, that same chiliad W may cover a xxx–forty sq. ft. of greenhouse space depending on one'southward physical location, time of the twelvemonth, and desired photon density at the canopy.

Determination

The versatility of the Cannabis sativa spp. constitute lends itself to beingness grown under a wide range of settings and environmental weather condition. And while the principal foci of almost cultivation operations growing outdoors, indoors, or in a greenhouse is always going to be production quality (that is, cannabinoid and terpene potency) and product safety (that is, presence of microbes, pests, heavy metals, pesticides, and so on); in that location are growing concerns over energy consumption and environmental stewardship that the industry needs to remain cognizant of. Hopefully mandates like what California has implemented with respect to energy-efficient lighting will be a catalyst for greater adoption of these technologies industry-wide. This is, of grade, the "green blitz" after all, and as such, it behooves the states all to assistance facilitate cannabis cultivation onto a "greener" and more sustainable trajectory.

References

1. R.J. Manes and Z.Fifty. Hildenbrand, Cannabis Scientific discipline and Applied science 4(ane), 40-45 (2021).
2. Energy Information Administration. Table five.6A: Average toll of electricity to ultimate customers by end-utilize sector. Accessed 2/23/21. https://world wide web.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_a.
3. Due south.K. Mikalonis, Assessing impact of Michigan's cannabis industry on land's electric grid requires data, planning. Accessed 2/25/21. https://www.plunkettcooney.com/environmentalandenergylawblog/cannabis-manufacture-electric-grid-bear on.
4. R. Walton, Marijuana grow houses trigger 7 summer outages for Pacific Ability. Published eleven/half-dozen/15. https://world wide web.utilitydive.com/news/marijuana-abound-houses-trigger-seven-summer-outages-for-pacific-power/408741/.
5. E. Mills, Free energy Policy 46, 58-67 (2012).
6. R.D. Schnepf, Energy use in agronomics: Background and Issues; Congressional Information Service, Library of Congress, 2004.

About the Authors

ZACARIAH HILDENBRAND and ROBERT MANES are with Curtis Mathes Corporation. Direct correspondence to:zhildenbrand@curtismathes.com

How to Cite this Article

R. Manes and Z. Hildenbrand,Cannabis Science and Engineering science 4(iii), 36-39 (2021).

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