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Baza danych projektów PROW

Development of the Energy-Neutral Greenhouse


This RDP funded project at horticulture Hjortebjerg succeeded in using solar energy from the summer period for heating and lighting greenhouses in winter when energy consumption is greater. Its results are cost savings and reduced energy consumption.


Greenhouses are traditionally heavy users of energy which represent high cost inputs for commercial horticultural businesses and can also impact negatively on the environment, Greenhouses annually receive more energy from the sun that required for heating in winter. Greenhouse heating leads to high costs in greenhouse production, thus by using the energy generated in the summer during the winter will cut costs but also CO2 emissions.


The purpose of the project was to develop technologies to heat greenhouses without the use of fossil fuels. Thus by using the energy that a greenhouse generates during the summer semester, it can become energy-neutral. The project aims to make greenhouses entirely self-sufficient with CO2-neutral heat, and thus independent of fossil fuels.

Main activities

A large-scale demonstration greenhouse has been established to demonstrate technology that consists of a reservoir in the subsurface which stores heat for later use. There are three installations linked by electrical and pipe connections, and which combined make the heating system, and are: (i) the surplus heat storage, (ii) the heat pump which moves the warm water to and from the subsurface storage and (iii) the ventilation equipment which either cools or heats the greenhouse as required.

Results & Benefits

The project has, as intended, succeeded in developing an entirely new heating system for greenhouse production. It has been possible to develop a system based on a cooling system, but which has been converted so that it stores heat in underground facilities. As intended, this development has succeeded in substantially reducing the greenhouse's use of fossil fuels and resulting in cost savings.

Lessons learnt

It has become clear through innovaton and new ideas it is possible to build an energy-neutral greenhouse. A key lesson is that it is worthwhile to invest time and money developing ideas such as this project, since the future dividend in the form of both economic returns as well as the environmental benefits will be overall significant.

Project location and other information

Søndersø i Nordfyn Kommune



RDP Territory


Total project cost (€)

880 000

EAFRD contribution (€)

264 000

National contribution (€)

264 000

Private contribution (€)

352 000

Project website

Contact name

Gartneriet Hjortebjerg I/S


+45 6174 8279

Languages for contact

English, Danish

At a glance



Final beneficiary type

Producer groups

Budget range

> €500 000

Start date:


End Date:


Theme / Measure:

• Competitiveness of Agriculture & Forestry
• Restructuring, developing physical potential, and promoting innovation
• 124: Cooperation for development of new products, processes and technologies


Green building, Heat supply, Renewable energy, Solar energy, Energy efficiency

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