Should a commercial greenhouse use wind or solar energy?
Both wind and solar can power a commercial greenhouse or farm. The better fit for a given site depends on its average wind speed, the roof and ground area available, the project budget, and which incentives the project can qualify for. Many sites use both, because wind and solar tend to generate at different times of day and year.
This guide compares the two on annual output, space requirements, installed cost, 2026 federal incentives, and end of life. It draws on product data from Ceres partner Eocycle and production and cost figures from a working Minnesota farm.
The size of any renewable system follows from the energy demand of the facility it serves. An energy-efficient greenhouse design needs less generating capacity to reach net-zero operation, which reduces the upfront cost of wind or solar equipment. Ceres commercial greenhouses can run entirely on electricity, so on-site wind and solar can supply all of their operating energy.
How does a wind turbine generate electricity?
Wind moving over a turbine’s blades creates lift, in the same way air moving over an airplane wing does, and the lift turns the rotor. In a direct-drive turbine, the rotor turns the generator without a gearbox in between. A transformer then converts the generator’s output to the voltage the connected facility or grid requires.
Solar panels work differently. Photovoltaic cells convert sunlight directly into direct-current electricity, and an inverter converts it to alternating current for use on site or export to the grid.
What types of wind turbines and solar panels suit commercial farms?
Commercial farms typically use distributed wind turbines in the 20 to 100 kW range and roof- or ground-mounted solar arrays sized to the site’s load. The table below summarizes the common options.
| System | Rated capacity | Characteristics |
|---|---|---|
| Eocycle EOX S-16 wind turbine | 25 kW | Direct drive with no gearbox; tower height of about 80 feet (24 m); designed for a 30-year life; sized for farms and small businesses |
| Eocycle EOX M-Series wind turbines (M-21, M-26) | 90 to 100 kW | Larger rotor and footprint than the S-16; sized for larger farms, small businesses, and microgrids |
| Monocrystalline solar panels | Varies by array | Higher efficiency per panel; suited to limited roof or ground area |
| Polycrystalline solar panels | Varies by array | Lower cost per panel and lower efficiency than monocrystalline |
| Thin-film solar panels | Varies by array | Lightweight and flexible; used where structures cannot carry standard panels; lower efficiency |
| Bifacial solar panels | Varies by array | Capture light on both faces, including light reflected from the ground |
| Building-integrated photovoltaics (BIPV) | Varies by array | Panels built into roofing or facade materials |
Turbine specifications are from Eocycle and wind-turbine-models.com. Certification testing of the S-16 to UL electrical safety standards received funding through the U.S. Department of Energy’s Competitiveness Improvement Project. A solar installer or engineer can recommend a panel type based on available area, budget, structural capacity, and local climate.
How much energy do wind turbines and solar panels produce?
A wind turbine’s annual output depends on its size and the average wind speed at hub height. Eocycle rates the 25 kW EOX S-16 at about 130,000 kWh per year at an average wind speed of 7.5 m/s (about 17 mph). That is enough electricity to run two 3,000 sq ft Ceres greenhouses. At the Minnick Farm in Minnesota, where average wind speeds are lower, the same model produces between about 83,000 and 86,500 kWh per year.
Solar output depends on panel capacity, orientation, and the site’s solar resource. Eocycle estimates that matching the S-16’s annual output at a good wind site takes roughly 65 kW of solar panels.
The two resources also produce at different times:
- Solar output peaks around midday and is higher in summer. It stops at night.
- Wind output follows wind speed rather than daylight, so a turbine generates at night and during cloudy weather whenever the wind is above its cut-in speed.
Estimates for a specific site are available from two free tools. The PVWatts calculator models solar output by location, and the Global Wind Atlas shows mean wind speed by location and height.
How much space do wind turbines and solar panels need?
A wind turbine uses less ground area than a solar array of equal annual output, but it needs open, unobstructed exposure to the wind. The EOX S-16 occupies about 10 feet of ground space, so farmland around it stays in production. Eocycle estimates that a solar array matching the output of its 25 kW turbine covers about two tennis courts of land, and an array matching its 90 kW turbine covers about ten.
Solar has more placement options. Panels can go on barn, shop, or headhouse roofs, or in smaller ground areas that are not suited to a turbine.
Other factors that affect siting for both technologies include:
- Setbacks and spacing from buildings, property lines, and other structures
- Local zoning rules and permitting
- Visual impact and neighbor considerations
- Environmental review requirements
- Room to expand the system later
- Incentive rules: under USDA’s 2026 REAP rule, ground-mounted solar and wind on certified cropland are not eligible for REAP grants (see the incentives section below)
How do wind and solar compare on cost, and what incentives apply in 2026?
On a farm with a good wind resource, a small wind turbine can cost less per kWh of annual output than solar, even though its total installed cost is higher. Solar has lower entry costs and more installers to choose from. Federal incentives for both changed significantly in 2025 and 2026.
Installed cost per kWh of annual output
The Minnick Farm in Minnesota runs both technologies, which allows a direct comparison before incentives:
| System | Installed cost | Annual output | Installed cost per kWh of annual output |
|---|---|---|---|
| Eocycle EOX S-16 wind turbine (25 kW) | $212,000 | 83,078 kWh | $2.55 |
| Solar array | $95,000 | 26,000 kWh | $3.65 |
These figures divide installed cost by one year of production. They are not the cost of electricity over the system’s life, which also depends on lifespan, maintenance, financing, and incentives.
Federal incentives as of October 2026
| Incentive | What it offers | Current status for wind and solar |
|---|---|---|
| Clean Electricity Investment Credit (Section 48E) | A tax credit based on a percentage of eligible project cost, generally 30% when labor requirements are met | Projects that began construction by July 4, 2026 keep eligibility. Projects beginning construction after that date must be placed in service by December 31, 2027. Foreign-entity sourcing restrictions also apply. |
| Bonus depreciation | 100% first-year depreciation of qualified property | Permanently restored for qualified property acquired after January 19, 2025. The depreciable basis is reduced by half of any investment tax credit claimed. |
| USDA Rural Energy for America Program (REAP) grants | Grants for agricultural producers and rural small businesses | New final rule published October 1, 2026, effective October 16, 2026. Grants cover up to 25% of eligible costs, with a $500,000 maximum for renewable energy systems. Projects apply after completion, with 12 months of actual production data. |
| REAP guaranteed loans | Loan guarantees for renewable energy and efficiency projects | Combined grant and guaranteed loan funding is capped at 75% of eligible project costs. |
The 2026 REAP rule also makes ground-mounted solar and wind on certified cropland ineligible, and excludes systems with components made in countries on the federal foreign adversary list. USDA has not yet announced the first application window under the new rule. A federal lawsuit challenging USDA’s earlier REAP changes was filed in September 2026, so program details may still change.
Sources: Eide Bailly, Sidley Austin, Bracewell, USDA Rural Development, and GreenLancer’s summary of the 2026 REAP final rule.
State incentives and renewable energy credits
Some states offer additional incentives. Minnesota, for example, provided property and sales tax exemptions for the Minnick Farm turbine. Projects that export power to the grid may also generate Renewable Energy Certificates (RECs), one for each megawatt-hour of renewable electricity delivered, which can be sold to buyers offsetting their own emissions.
Incentive eligibility depends on project timing, ownership structure, and location. Confirm eligibility with a tax professional before making financing decisions. The Ceres financing page lists programs available to greenhouse growers.
Where does a wind turbine make sense?
An Eocycle wind turbine needs an average wind speed of at least 10 mph (4.4 m/s) at a hub height of about 80 feet. Below that threshold, solar is usually the more practical option. A site can be checked against this threshold in a few minutes:
- Find the coordinates of the proposed turbine location in Google Maps.
- Enter them into the search bar of the Global Wind Atlas.
- Read the mean wind speed at the 10-meter height setting. It should be above 4 m/s.
- Switch to the 50-meter height setting. The mean wind speed there should be above 5 m/s.
A site that meets both thresholds is a candidate for a detailed wind assessment. Eocycle prepares a site-specific wind quote that estimates annual production from local wind data.
What do wind and solar produce on a working farm?
The Minnick Farm in Cosmos, Minnesota has grown grain since 1867. Rising electricity use for crop drying led owner Brad Minnick to install an Eocycle EOX S-16 (25 kW) wind turbine, which produces between about 83,000 and 86,500 kWh per year. The farm later added a solar array that produces about 26,000 kWh per year.
The turbine project used incentives available at the time of installation: a 26% federal investment tax credit, USDA support, and Minnesota property and sales tax exemptions. Current federal incentive rules differ, as described above.
This is an Eocycle installation on a grain farm rather than a Ceres greenhouse project. It is included here because it provides measured production and installed cost data for both technologies at a single site.
Why combine wind and solar on one site?
A combined system produces power across more hours of the day and year than either technology alone. Solar output peaks during summer middays, while wind output often continues at night and through cloudy or winter weather, so each fills gaps in the other’s production.
Pairing generation with battery storage extends coverage further. Eocycle turbines are designed to connect to battery storage, and solar inverters are commonly paired with batteries. For an all-electric Ceres greenhouse, wind, solar, and storage together can supply operating energy with less reliance on grid power.
What happens to solar panels and wind turbines at end of life?
Most of the material in both technologies can be recovered. Solar panels are made largely of glass, aluminum, and silicon, and dedicated panel recycling services operate in the United States and Europe. Small wind turbine towers and generators are made largely of steel and copper, which have established recycling markets. Turbine blades are made of composite materials and are the main recycling challenge for wind.
Because many commercial systems are designed to operate for 25 to 30 years, end-of-life planning is part of the initial project budget. Ask installers what take-back or recycling options they offer before purchase.
Plan renewable energy for your greenhouse
Ceres designs all-electric commercial greenhouses and works with Eocycle to pair them with on-site wind generation. Speak with a Ceres engineer about powering your greenhouse with wind, solar, or both.
