Last month, Inagro participated in an inspiring study visit as part of the RE-Greenhouse project, organized by CTIFL. During this intensive three-day trip, we explored various innovative pilot setups where renewable energy plays a central role in greenhouse horticulture. We also brought together international researchers for engaging meetings to exchange knowledge and insights.
Waste Heat
The first visit was to a 7-hectare greenhouse company growing tomatoes. What makes this site unique is its use of waste heat from a nearby intermunicipal waste processing facility. More than 95% of the required heat is sustainably generated this way. The remaining need is only covered by local burners during maintenance work. A challenge on-site is the lack of a CHP (combined heat and power) system, meaning CO₂ cannot be recovered. This CO₂ is crucial for optimal production capacity in the greenhouse. However, this is creatively solved by purchasing green CO₂ from a local cooperative biogas plant.
Heating and Ventilation Strategies
At CTIFL, we explored advanced research greenhouses where various heating and ventilation strategies are being tested. The goal is to grow crops with lower energy needs without compromising the quality or health of the plants. After this tour, there was an intriguing debate on developing a decision-making tool for renewable energy in greenhouse horticulture.
Heating with a Wood Gasifier
Another impressive example of sustainability was found at a greenhouse company heated entirely with a wood gasifier. Waste wood from the local area, ranging from moist, chipped wood (up to 60% moisture content) to dry wood (less than 20% moisture), is used. This system heats circulating water to 92°C, which then flows through the greenhouses to create temperature zones tailored to the specific needs of the crops, from germination to hardening off.
Agrivoltaics as Protection and Energy Source
In Southern France, we visited a pilot site where agrivoltaics (the combination of agriculture and solar energy) is being implemented. The local college is testing applications that protect plants from rising temperatures and water stress caused by climate change. This technology reduces leaf burn and excessive evaporation, saves up to 50% water, and generates renewable energy—a brilliant example of a win-win solution.
Numerous Possibilities
This study visit once again highlighted the immense possibilities of renewable energy in greenhouse horticulture and provided a valuable opportunity for partners to connect. The insights gained bring us one step closer to a sustainable future for the sector.