Power and Backup Generators for Commercial Grow Rooms
Commercial grow rooms and indoor greenhouses are among the most power-intensive operations in agriculture. Grow lights, HVAC systems, irrigation pumps, CO₂ controls, dehumidifiers, and fertigation equipment all run continuously. A single power outage can destroy an entire crop cycle.
Whether you operate a cannabis cultivation facility, a vertical farming warehouse, a commercial mushroom grow, or a traditional controlled-environment greenhouse, protecting your operation with a reliable generator is not optional.
Depco Power Systems stocks new, rebuilt, and used generators purpose-suited for grow room and greenhouse applications. We carry both diesel and natural gas generator sets from Caterpillar, Cummins, Generac, and other major manufacturers. Our generators come in sizes ranging from 100 kW to 2,000 kW and are ready to ship from our Houston facility.
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Choosing Between Diesel and Natural Gas
The two most common generator types for grow rooms and greenhouses are diesel and natural gas, and the right choice depends on your facility's infrastructure, runtime requirements, and fuel access.
Diesel generators offer the highest fuel energy density, fast startup, and no dependence on a utility gas line. They are well suited for locations without natural gas service, for operations that need a true standalone emergency backup, or for facilities that require portable power. The trade-off is on-site fuel storage, regular maintenance intervals, and fuel costs that fluctuate with diesel prices.
Natural gas generators connect directly to the utility gas supply, eliminating the need for on-site fuel storage and the logistics of diesel deliveries. They are popular for larger grow operations where the generator runs frequently or continuously , which is common in multi-tier cannabis facilities and large greenhouse complexes that experience regular grid instability. Natural gas units from Cummins (QSK series) and Caterpillar (G3500 series) are among the most widely used in commercial cultivation.
Sizing Your Generator
Undersizing is the most common mistake grow room operators make when specifying a generator. A generator must handle not just the steady-state load of your equipment, but also the inrush current when large motors start. To properly size a unit, calculate:
- Total connected load in kW (all lighting, HVAC, irrigation, controls)
- Largest single motor inrush load (typically your chiller or air handler)
- Whether the generator will serve as a full backup, a partial backup, or a primary power source
As a general starting point: a 10,000 sq ft commercial grow room with high-intensity discharge lighting and central HVAC typically requires 300–500 kW of backup capacity. Large multi-facility cannabis campuses and commercial greenhouse complexes routinely require 1,000 kW or more. Depco's sales team can help you calculate the right size for your specific load profile
Grow Room and Greenhouse Generator Applications
- Depco supplies generators for the full range of controlled-environment agriculture and indoor cultivation operations:
- Cannabis cultivation facilities: Backup and primary power for licensed cannabis grows, where a power loss during flower can mean complete crop loss. Both diesel standby and natural gas continuous-duty configurations available.
- Vertical farms and indoor food production: Generator sets for leafy greens, tomato, herb, and strawberry vertical farming operations, where LED lighting and climate control run 18–24 hours per day.
- Commercial mushroom grows: Stable power for humidity chambers, substrate sterilization equipment, and fruiting room climate controls.
- Traditional commercial greenhouses: Backup power for irrigation, supplemental lighting, heating systems, and environmental controls in large-scale greenhouse vegetable and flower production.
- Research and university grow facilities: Reliable standby power for controlled-environment research labs where experimental continuity is critical.
- Hemp and specialty crop operations: Generator solutions for outdoor-to-indoor transition facilities and drying/processing operations
Generator Brands We Carry for Grow Applications
- Caterpillar: C18, C27, C32, C32B, and G3500 series for high-capacity diesel and natural gas applications
- Cummins: QSK19, QSK45, QSK60, and QSK78 for large-scale natural gas grow facilities; C series for diesel standby
- Generac: SG and MG series natural gas generators for mid-size operations
- Kohler: KD series diesel for critical standby in regulated cannabis environments
Browse Our Inventory of Grow Room Generators
Frequently Asked Questions: Grow Room & Greenhouse Generators
What size generator do I need for a grow room?
Generator sizing for a grow room depends primarily on your total electrical load, including grow lights, HVAC, dehumidifiers, irrigation pumps, CO₂ systems, and any other equipment running simultaneously. A small 2,000–4,000 sq ft commercial grow typically requires 100–200 kW of backup capacity. A mid-size operation of 10,000–20,000 sq ft commonly needs 300–600 kW. Large cannabis campuses and commercial greenhouses over 50,000 sq ft may require 1,000 kW or more. Always add 20–25% capacity above your calculated load to handle motor inrush currents and future expansion. Depco's team can help you calculate the right size.
What is the best generator for a commercial greenhouse?
The best generator for a commercial greenhouse depends on whether you need backup (standby) or continuous (prime) power, and whether you have access to utility natural gas. For facilities with natural gas service and frequent power instability, a Cummins QSK-series or Caterpillar G3500-series natural gas generator eliminate fuel storage and offer lower operating costs at high runtime hours. For locations without gas service or for pure emergency backup, a diesel generator from Caterpillar (C-series) or Cummins (QSB, QSL, QSK) provides reliable standalone protection. Depco stocks both types in a range of output sizes.
Do grow rooms need a backup generator?
Yes. Commercial grow rooms and greenhouses have no tolerance for power outages. Crops under artificial lighting can suffer heat stress within hours of losing HVAC. Cannabis plants in late flower can be lost entirely from a single extended outage. Most state cannabis regulations require licensed growers to have a documented backup power plan, and some require a licensed standby generator as a condition of facility approval. Even for non-cannabis grows, the financial exposure from losing a full crop cycle far exceeds the cost of a properly sized generator.
Can I use a natural gas generator for a cannabis grow room?
Yes, and natural gas generators are increasingly common in larger cannabis cultivation facilities. They eliminate on-site diesel storage (which can be a compliance concern in some jurisdictions), reduce fuel delivery logistics, and offer lower fuel costs per kWh when running at high hours. The primary requirement is access to a utility natural gas line with adequate pressure and volume for your generator size. Cummins QSK-series and Caterpillar G3500-series natural gas generators are among the most commonly specified for large cannabis facilities. Depco has both new and used natural gas generator sets in stock in sizes from 500 kW to 1,500 kW and above.
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