Commercial Hydroponic Systems: Towers, Costs and Yields

Commercial hydroponic systems grow crops in a recirculating nutrient solution instead of soil, in channels, towers or stacked racks. A 2015 study by Barbosa and colleagues estimated that greenhouse hydroponic lettuce in Arizona yielded about 11 times more per square metre than field lettuce and used about 13 times less water per kilogram, but needed about 82 times more energy. That trade (less land and water, more electricity) decides whether a commercial system pays.

This guide compares the six main system types used by commercial growers, with a “Best for” line for each. It sets out the research on yield, water and energy, the cost numbers published so far, and the lessons from large vertical farms that failed. A calculator lets you test your own yield, price and power cost before you buy.

Commercial hydroponic systems at a glance

The table sums up the six designs covered below. Each has its own section with its strengths, its limits and the crops it suits.

How we chose and checked the numbers

We grouped commercial systems by how they deliver water and nutrients to the roots, since that sets the crops, labour and energy each one needs. We did not rank brands. Product lines change often, and the same design is sold by many makers.

The yield, water and energy figures come from peer-reviewed studies. Market figures come from the USDA Economic Research Service, Statistics Canada and Agriculture and Agri-Food Canada. Every number carries its source and year. Where a study modelled one crop in one place, we say so, because results for lettuce in Arizona will not hold for tomatoes in Ontario.

The six main types of commercial hydroponic systems

All six recirculate or reuse a nutrient solution. They differ in how much water sits around the roots, how many layers they stack, and how much power they need for pumps, lights and climate control.

1. Nutrient film technique (NFT) channels

In NFT, a shallow stream of nutrient solution runs down sloped plastic channels. Plants sit in holes along the top, and their roots touch the film. The solution drains to a tank and is pumped back up. NFT uses little water at any one time, so it is light and easy to stack. The weak point is that roots dry out within minutes if a pump fails, so growers need alarms and backup power.

Best for: lettuce, basil and other short-cycle greens in greenhouses or on indoor racks.

2. Deep water culture (DWC) or raft systems

In DWC, plants float on foam rafts on top of long ponds of aerated solution. The large water volume holds temperature and nutrient levels steady, which gives a buffer if power fails for a short time. Ponds are heavy, so DWC almost always runs on one level on the ground. Workers can push rafts along the pond from planting to harvest, which suits a flow-line layout.

Best for: high-volume lettuce in large single-layer greenhouses.

3. Vertical hydroponic towers

Tower systems stand plants in pockets around a vertical column. A pump lifts solution to the top and it drips or sprays down past the roots, then drains back to a reservoir. Aeroponic towers spray a mist rather than letting water trickle. Towers fit many plants on a small floor area and are easy to set up in a greenhouse, a hoop house or a covered yard.

Light is the catch. Plants at the top of a tower get more light than those at the bottom, and towers placed close together shade each other. Commercial tower growers often space rows wider, turn towers, or add lights to even out growth.

Best for: small farms, farm stands, schools and restaurants that want greens and herbs on little floor space.

4. Stacked indoor vertical racks

Indoor vertical farms stack shelves of NFT or ebb-and-flow trays five to fifteen layers high, each lit by LEDs. Climate, light and carbon dioxide are fully controlled, so the farm can run all year in a warehouse or shipping container. A 2016 study in Food and Energy Security found that vertical growing columns produced 13.8 times more lettuce per square metre of floor than a single-layer hydroponic system, mainly because they held 20 times more plants, although each plant was smaller.

Every layer needs its own lights, so electricity is the largest running cost. This design suits crops that sell at a high price per kilogram and spoil fast, such as microgreens and baby greens.

Best for: city sites with buyers close by who pay for freshness and steady supply.

5. Dutch bucket systems

Dutch buckets (Bato buckets) are rows of small buckets filled with perlite, clay pebbles or another medium. Drip lines feed each bucket, and a siphon elbow drains the surplus to a return pipe. Each plant has its own container, so one sick plant is easy to remove. The design supports tall vine crops trained up strings.

Best for: tomatoes, cucumbers and peppers in smaller commercial greenhouses.

6. Substrate slab (drip) systems

Large greenhouse vegetable firms grow most tomatoes, peppers and cucumbers on rockwool or coir slabs fed by drip lines. Drain water is collected, disinfected and reused in closed systems. These are the systems behind much of the greenhouse produce in North American stores. The USDA Economic Research Service reported that more than 60 percent of controlled-environment tomatoes, cucumbers and lettuce in the United States were grown using hydroponics in 2019.

Best for: high-volume vine crops where steady climate and precise feeding pay back the build cost.

Yield, water and energy: what the research shows

The most cited comparison is the 2015 Arizona State University study by Barbosa and colleagues. It modelled lettuce grown in Yuma, Arizona, in a greenhouse hydroponic system against conventional field production.

Chart

Lettuce yield: greenhouse hydroponic vs field

kg per m² per year, modelled for Yuma, Arizona

That works out to about 11 times the yield and 13 times less water per kilogram, but about 82 times more energy, mostly for heating, cooling and lighting. The study modelled one crop in a hot desert climate; results in cooler places differ, mostly through heating.

Stacked indoor farms raise yield per square metre of floor further, but add artificial light on every layer. A 2025 analysis in Plant Physiology cites a commercial vertical farm that used about 5 million kWh of electricity to produce about 500,000 kg of lettuce in a year, or 10 kWh per kg. For a commercial buyer, the practical point is simple: hydroponics saves land and water, and pays for that with electricity.

Water savings are real for recirculating systems, but the USDA ERS notes that hydroponic farms may also use water for heating and cooling, so the full water footprint depends on the site.

What commercial hydroponics costs to run

Published cost studies point to three big lines: electricity, labour and the depreciation of equipment. Their weight depends on the design. A greenhouse with sunlight spends far less on light than an indoor farm, but more on heating in a cold winter.

• Electricity. At the 10 kWh per kg cited above, power at US$0.12 per kWh adds US$1.20 to each kilogram of lettuce before any other cost.
• Full cost per kilogram. A 2026 economic model in Frontiers in Sustainable Food Systems put the total cost of vertically farmed lettuce between €3.26 and €1.67 per kg of fresh weight, from today’s light-use efficiency to a projected next-generation farm. It found today’s vertical lettuce cost more than the Dutch greenhouse benchmark.
• Equipment and monitoring. A 2025 study of two Italian vertical farms lists high start-up costs for equipment, constant monitoring of pH, electrical conductivity and nutrients, and full dependence on electricity among the main challenges.

Prices for the crop matter as much as costs. Lettuce made up nearly 20 percent of the US$21.8 billion that US growers earned from vegetables and melons in 2022, according to a University of Kentucky hydroponic lettuce crop profile. A large market does not guarantee a good price: hydroponic greens compete with field lettuce from California and Arizona and with imports.

Use the calculator below to test your own numbers. The defaults are examples set close to break-even, not benchmarks. Before you borrow for a build, get professional advice on your business plan, local power tariffs and building rules.

Try the numbers for your own farm below.

Market size: who grows with commercial hydroponics

Controlled-environment farming is still small next to field farming, but it has grown. The USDA ERS counted 2,994 controlled-environment operations growing food crops in the United States in 2019, up from 1,015 in 1998, based on Census of Agriculture data.

Chart

Canada greenhouse vegetable area by crop

Harvested area in 2024, thousand m²

Canada has one of the largest greenhouse vegetable sectors in the Americas. Statistics Canada reported greenhouse vegetable and fruit sales of C$2.7 billion in 2024, up 8.5% on the year before. The Agriculture and Agri-Food Canada statistical overview shows harvested greenhouse vegetable area rising from about 18.3 million m² in 2020 to 23.4 million m² in 2024.

Tomatoes, peppers and cucumbers fill more than 90% of that Canadian area. Lettuce covered 383,002 m² in 2024, about 1.6%, and microgreens about 0.2%. Leafy greens, the main crop of vertical towers and indoor farms, are a small part of greenhouse output by area.

Chart

Canada’s harvested greenhouse vegetable area

Million m², all greenhouse vegetables and specialized fruits, 2020 to 2024

Lessons from vertical farm failures

Several well-funded indoor vertical farms have failed, which is worth knowing before you invest. Food Dive reported in June 2023 that AeroFarms, which had raised US$238 million, filed for Chapter 11 bankruptcy protection and cited headwinds facing the vertical farming industry. Plenty, which had raised nearly US$1 billion, filed for bankruptcy in March 2025 (TechCrunch).

The shared lessons are practical. Energy costs per kilogram were high, building costs were large, and greens sold at prices close to field produce. Smaller growers who start with a greenhouse, a modest tower set-up or a single container, sell direct, and scale only after they know their real yield and costs take less risk.

▶ Ten farm businesses you can start small, from a shelf of microgreens upward. · 6:03

Vertical hydroponics towers for small growers

Small tower systems let a grower start with little money and space. A single tower can hold several dozen plants, and a small greenhouse can hold a few dozen towers. Small units also suit schools, restaurants and community gardens that want fresh greens through the year.

• Start small. Run one or two towers for a full season to learn your real yield, labour and losses.
• Use daylight where you can. A tower in a greenhouse or under a clear roof needs far less electric light than one in a basement.
• Plan for power cuts. Towers and NFT channels dry out fast if the pump stops. A battery backup or a timer alarm is cheap insurance.
• Keep records. Note planting dates, harvest weights, pH and electrical conductivity. These records tell you when to scale.

A small set-up is also how many growers test a market before they commit to a commercial system. The USDA Agricultural Research Service notes that for some crops vertical farming can give 10 to 20 times the yield per acre of open-field production.

▶ Ten low-cost farm business ideas, including hydroponic growing and microgreens. · 8:32

Smart hydroponic systems: sensors and controls

Smart systems add sensors and software to the basic hardware. The aim is to keep the nutrient solution and climate in range with less hands-on work and to warn the grower before a problem harms the crop.

• Automatic dosing. Probes read pH and electrical conductivity (EC), and pumps add acid, base or nutrient concentrate to hold set points.
• Climate control. Sensors for temperature, humidity and carbon dioxide drive fans, heaters, foggers and vents.
• Lighting control. LED schedules and dimming match light to the crop stage and to the price of power by hour.
• Alarms and remote access. Phone alerts for pump failure, low tank level or out-of-range readings let a small team cover nights and weekends.
• Data logs. Records of inputs and harvests show which settings give the best yield per kWh.

Sensors need care. Probes drift and must be calibrated against reference solutions on a set schedule. A wrong pH reading that drives an automatic doser can harm a whole crop. The Cornell Controlled Environment Agriculture program offers research and grower resources on these controls.

Before buying a commercial system

Use these steps to size and test a commercial hydroponics project before you commit.

1. Find your buyer first. Talk to stores, restaurants and wholesalers. Ask what crops, volumes, pack sizes and prices they want.
2. Pick the crop, then the system. Leafy greens suit NFT, DWC and towers; vine crops suit Dutch buckets or slabs.
3. Get real power and heat costs. Ask your utility for the commercial tariff, demand charges and any time-of-use rates. In cold places, work out heating needs as well; Purdue’s guide to greenhouse heating requirements shows the method.
4. Model yield and cost per kilogram. Use the calculator above with your own numbers and a low, middle and high yield case.
5. Check rules and food safety. Check zoning, building permits, water discharge rules and food safety requirements with local authorities.
6. Pilot before you scale. Run a small unit for at least one full year to learn your real yield, losses and labour.

Keep a written plan for pests and disease. Enclosed systems reduce pest pressure, but aphids, thrips and root diseases such as Pythium still reach them. Check product labels and local rules before you use any pest control product.

Where satellite data fits a hydroponics business

Hydroponic crops grow indoors, so satellites do not watch them directly. Satellite data still helps growers who run field crops beside a greenhouse, who buy from contract farms, or who need weather and climate data for site planning.

Developers who build dashboards for growers can pull weather and satellite crop data through an agricultural weather and satellite API. Businesses that manage many growers can use a large-scale farm management dashboard. Buyers who need proof of origin can use crop and product traceability tools, and firms that report emissions can track their farm carbon footprint. The Farmonaut Satellite + AI Farm Monitoring System covers the field side of a mixed business.

▶ A walk-through of the Farmonaut web app for satellite field monitoring. · 8:02

FAQ

What is a commercial hydroponic system?

It is a soilless growing set-up built to supply crops for sale, using a nutrient solution delivered by channels, ponds, towers, buckets or slabs. Commercial systems are larger than home kits and add controls for climate, feeding and alarms.

Which hydroponic system is best for commercial lettuce?

Greenhouse lettuce growers mostly use NFT channels or deep water culture rafts. NFT is light and can be stacked; DWC holds steadier conditions and suits large single-layer greenhouses. Indoor stacked racks give the most yield per square metre of floor but use the most electricity.

How much more does hydroponics yield than field farming?

The 2015 Barbosa study estimated greenhouse hydroponic lettuce in Arizona yielded about 41 kg per m² per year against 3.9 kg in the field, about 11 times more. The gap depends on the crop, climate and system.

Is commercial hydroponics profitable?

It can be, but margins depend on energy cost, crop price and yield. Several large vertical farms, including AeroFarms in 2023 and Plenty in 2025, filed for bankruptcy. Test your own numbers with the calculator and get professional financial advice before you invest.

How much electricity does a vertical farm use?

A commercial vertical farm cited in a 2025 Plant Physiology analysis used about 10 kWh of electricity per kilogram of lettuce. Greenhouses that use daylight need far less light energy but may need more heat in winter.