Functioning green roofs support the efficiency of Photovoltaic systems. The German Association of Nature and Environmental Protection quote 20 percent higher efficiency for the summer months.
This report focuses on extensive green roofs as roofs, which are defined by the German FLL as roofs that 'involve natural vegetation, which require hardly any external input for either maintenance or development.'
Over the last 14 years several biodiverse extensive green roofs have been in stalled in Basel in combination with Solar panels. This has included both Solar thermal and solar energy (PV). Part of the drive for this has been to improve biodiversity in the city through the need for ecological compensation on new developments. Something was taken and to be compensated for. This is different from ecological replacement or restoration.
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- Biosolare Dächer und Ökologischer Ausgleich in der Schweiz