The Energy Cost of Indoor Cannabis: kWh Per Pound & How to Lower It
Indoor cultivation runs on electricity, and most facilities know exactly what they pay the utility every month. Far fewer know what they pay per pound. The monthly bill is a number you react to; cannabis grow energy cost per pound is a number you can manage — and the two move very differently.
Energy is one of the largest controllable lines in the COGS stack, often second only to labor. Treating it as a fixed cost of doing business leaves money on the table every cycle.
Where the kWh Actually Go
Before you can lower energy cost, you have to know where it goes. An indoor grow's electrical load breaks into four main buckets, and the split surprises operators who assume it is all lighting.
| System | Typical share of grow energy | What drives it |
|---|---|---|
| Lighting | ~40–55% | Fixture wattage, photoperiod, fixture efficiency |
| HVAC (cooling) | ~25–35% | Sensible load from lights, climate, room envelope |
| Dehumidification | ~10–20% | Latent load from plant transpiration / irrigation volume |
| Pumps, fans, controls | ~5–10% | Fertigation, circulation, exhaust, sensors |
Lighting is the largest single bucket but it is not the whole story — HVAC and dehumidification together often rival it, and they exist largely to handle the heat and moisture that lighting and irrigation create. The systems are coupled. That matters because it means an efficiency gain in one place ripples into the others: a more efficient fixture lowers the sensible load the HVAC has to remove.
kWh Per Pound: The Benchmark That Matters
The benchmark to track is kWh per pound — total facility energy consumed divided by pounds produced. It normalizes for facility size and lets you compare a room to a room, a cycle to a cycle, and your operation to the industry.
Indoor facilities commonly land somewhere in the range of 2,000 to 4,000+ kWh per pound depending on lighting technology, climate, and how well the rooms are run. The spread is wide, and where you fall in it is largely a function of two things: the efficiency of your equipment, and your yield.
A facility chasing a lower power bill is solving the wrong problem. The number that runs the business is kWh per pound — and yield is half of that ratio.
That second half is the point most energy conversations miss. kWh per pound has a numerator and a denominator. You can attack the numerator with better equipment — and you should — but you can also attack the denominator by producing more pounds on the same load.
LED Conversion Math
The clearest equipment lever is the HPS-to-LED conversion. LED fixtures deliver more photosynthetic light per watt than HPS, which cuts the lighting bucket directly. They also run cooler, which trims the sensible load and lets you downsize or relieve the HVAC bucket — a second-order saving that conversion ROI models often leave out.
The conversion is real capital, and the payback math depends on your rate per kWh, your run hours, and any utility rebates — many jurisdictions offer significant rebates for horticultural LED retrofits that should be in the calculation. The point is to run the full number, including the HVAC knock-on effect, not just the fixture-wattage delta.
Demand Charges and Time-of-Use
Two line items on a commercial electric bill catch operators off guard.
Demand charges bill you on your peak draw, not just total consumption — the highest 15-minute load in the billing period sets a charge that can be a large share of the bill. Staggering lighting schedules across rooms so they do not all switch on at the same instant flattens that peak.
Time-of-use rates charge more for energy during peak grid hours. Where your local rate structure allows it, shifting photoperiods so the bulk of lighting runs during off-peak windows lowers cost without changing a single kWh of consumption. Neither of these touches yield — they are pure rate management — but they are real money and they are often ignored.
Use the interactive Energy Cost-Per-Pound Calculator below to run your own numbers — enter your total facility kW, hours per day, your rate per kWh, and annual pounds produced, and it returns your kWh per pound and your energy cost per pound.
Why lb/light Is the Real Energy Lever
Here is the connection that reframes the whole topic. Your lighting load is essentially fixed — those fixtures draw their watts for their photoperiod whether the room yields well or badly. The energy cost of running the room is close to constant. What is not constant is how many pounds that constant energy produces.
That means lb/light is the most direct lever you have on energy cost per pound. Push lb/light from 1.3 to 1.7 and you have cut energy cost per pound by roughly a quarter — without buying a single fixture, without a rebate application, without touching the rate structure. The energy was always going to be spent. Higher yield per light spreads that same energy over more weight.
Equipment efficiency lowers the numerator. Yield efficiency lowers the denominator. The second one is usually the larger and faster lever, and it is the one most facilities are not actively managing.
The Hyper Yield Angle
This is where consistent crop steering becomes an energy story. Hyper Yield's nightly pipeline analyzes Aroya data across a 15-room, 109-zone facility and produces per-zone morning directives — the P1/P2 parameters, EC and pH targets that steer each zone toward its yield potential. The energy load of those rooms does not change. What changes is the yield that load produces.
Steering that is consistent across every zone, every day, lifts lb/light — and because the energy spend is fixed, every point of lb/light is a direct cut to kWh per pound and energy cost per pound. Variance works the other way: a zone that drifts and underperforms still drew every watt. The directive workflow, with grower review and logged overrides, is what holds the steering consistent enough to make the yield gain real. Lower energy cost per pound is not only an equipment purchase. It is also a steering discipline.
See what Hyper Yield does for lb/light at your facility. Book a demo →
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