Updating the solar cadastre

With the city of Jena's solar cadastre, all citizens and entrepreneurs can view the potential of their own building for the use of solar energy. This map has been available for over 10 years and has now been updated.

The aim is to provide initial information on whether your own roof could be suitable for a photovoltaic or solar thermal system due to its orientation, shading and inclination. Of course, this register is no substitute for a subsequent technical assessment and advice from a specialist.

Christian Gerlitz, Mayor and Head of the Department for Urban Development and the Environment, sees two important points: "Compared to other Thuringian cities, the number and output of photovoltaic systems installed in Jena can definitely be expanded. Updating the solar cadastre is therefore a small but important building block in order to better position ourselves here in the future. Above all, however, we want to support citizens in switching to renewable energies."

The solar cadastre can be accessed via the city of Jena's map portal and shows the basic suitability of buildings and roof areas for the use of solar energy. This data set was previously dated 2011 and has now been updated with high-resolution laser scan data from 2020. The Thuringian State Office for Land Management and Geoinformation (TLBG) updates these elevation models approximately every 5 years and makes them available for download free of charge.

Query various parameters on the topic of solar energy

In the solar cadastre calculated by the city of Jena, various parameters of the roof areas can be queried on the subject of solar energy. In addition to the size of the roof area suitable for solar use, the user can also display the annual irradiation total. As a result, the suitability class of the roof area is displayed on a scale from 0 = not suitable to 3 = very suitable by clicking on the corresponding area.

The long-term climate protection goal of the city of Jena is to achieve climate neutrality by 2035. This requires efforts in many different areas, far beyond the city administration buildings. According to the Climate Action Plan, 100% of the electricity consumed in Jena is to be generated from renewable energy sources by 2035.