Bioenergy Village

A bio-energy village is a concept for the use of renewable energy sources in rural areas. The system uses biomass produced by local agriculture and forestry in a Biogas powerplant in order to supply the whole energy demand of a village, as electricity and district heating.

These villages tend to be self-powered and independent from external grids. The term bio-energy village describes only the energy dependency on fresh biologic material, whereas an ecovillage includes much more differentiated networks.

Examples of such villages are Jühnde near Göttingen and Mauenheim near Tuttlingen in Germany.

Energy production

Liquid manure, grass, silage and other raw materials from agriculture are fermented in a biological gas facility. The biogas produced fuels a combined heat and power plant (CHP). The heat is distributed over a district heating system, while power is fed into a local electricity grid. In winter additional heat requirements can be supplied by an additional heating plant, in which wood chips or straw are burned.

Existing projects

Jühnde

The first bio-energy village in Germany is Jühnde in the district of Göttingen. A project of the Interdisciplinary Centre For Sustainable Development (IZNE) at the University of Göttingen, and completed in January 2006, the project supplies the heat requirement of the village, and produces twice as much electricity as is used. It has been estimated that the participating households save €750 per year in energy costs.

Mauenheim

In Mauenheim, Baden-Württemberg, a bio-energy village has been developed in Immendingen in the district of Tuttlingen, with approximately 400 inhabitants and 148 buildings. The biogas facility and wood chip heating system are supplemented by a solar energy system. The project started operation in 2006. It has been calculated that about 1900 tonnes of CO₂ per year will be saved.

Rai Breitenbach

The Breuberger village of Rai Breitenbach in the Odenwald (approximately 890 inhabitants) is in the process of becoming a bio-energy village. At present the project is still in the planning stage. A feasibility study has been completed and a co-operative created to carry out the project, which is expected to be completed in 2008.

Considerations

Advantages

* No climatically harmful waste gases are released. The risks and waste disposal problem of nuclear energy are avoided.
* The energy produced is often cheaper for consumers than conventional energy.
* Local resources are used, saving transportation energy costs.
* Energy costs are locally spent, strengthening the local economy and creating jobs.

Disadvantages

* Capital outlays are high.
* The system works only if a large majority of the inhabitants participate, and can be attached to the local heating supply network.

External links

* [http://www.bioenergiedorf.info/start_english.htm Interdisciplinary Centre For Sustainable Development]
* [http://www.bioenergiedorf.de/contenido/cms/front_content.php?idcat=13&changelang=6 Jühnde village web site]