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The GROOF (Greenhouses to reduce CO² on Roofs) project is an innovative cross-sectoral approach to reduce CO² emissions in the construction and agriculture sectors by combining energy sharing and local food production.

The idea is to use rooftop greenhouses as a tool to:

  • Recover actively (use of the ventilation system) and passively (insulation effect) the heat produced and otherwise lost by the support building in a horticultural production installed in a rooftop greenhouse,

  • Collect the CO² produced by human activity and the activities of the support building to feed the plants,

Practically, the project facilitates the emergence of this type of greenhouse on the market by demonstrating and disseminating good practices to actors in the building and agricultural sectors that are favourable to the development of profitable and functional economic and social models.

The project specifically aims to:

  • Identify and reduce market access barriers (urban planning rules, technical regulations, insurance, etc.): GROOF teams studied the practices in different NWE countries as long as the local regulations. The interview of several pioneers such as BIGH (Belgium), Urban Farmers (The Netherlands), Universitat Autònoma de Barcelona (Spain) and others provided valuable information that will be used to produce guidelines for early adopters struggling with the implementation of CO²-cutting rooftop greenhouses.

  • Support the first users in the implementation of their project: 10 early adopters have been selected through an open call and are currently coached by GROOF experts. The success of those 10 different profiles will demonstrate the relevance of several business models involving rooftop greenhouses and is expected to inspire others. You can discover the early adopters here.

  • Experiment and demonstrate the effectiveness of the technology for a representative number of business and social models: GROOF is investing in four pilot projects, designed to prove the effectiveness and sustainability of models related to different types of buildings. They are located in France, Belgium, Luxembourg and Germany. You can discover them here.

The results of each activity will be openly shared on our international community on the online platform Construction21 where regional and national public authorities, SMEs and large enterprises, research centres and general public are invited to interact. 

This community also host a mapping of existing and planned rooftop greenhouse projects in the world. Each project leader is invited to fill in the information of his or her project in order to share it with the world and benefit from the community’s feedback.


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Like the other fourteen European transnational cooperation programmes, we encourage public, private, scientific and civil society organisations to cooperate in order to improve the economic, environmental, social and territorial development of Europe's regions.

Reducing disparities between regions

Interreg NWE is one of instruments to implement the European Cohesion Policy. Its purpose is to reduce disparities between the various regions in North-West Europe. The EU's most recent treaty, the Lisbon Treaty, adds another facet to cohesion, referring to ‘economic, social and territorial cohesion’. The idea is that cohesion policy should also promote more balanced, more sustainable ‘territorial development’.

 In the 2014-2020 budgetary period, the links between cohesion policy and the other EU policies contributing to regional development are stronger, namely rural development and fisheries and maritime policy. More about Cohesion Policy 

Transnational Cooperation as a method

We support cooperation across borders in a large European area: North-West Europe. For that, we fund projects involving partners from at least 3 different countries with a joint approach to tackle common issues. The aim is to reduce the disparities among regions and raise the overall level of performance across the whole area.

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