Green roofs

Vertical solar installations for biosolar roofs

Vertical solar installations offer a unique opportunity for combining solar power production with green roofs. The combination of renewable energy and green areas will play an important role in increasing sustainability of urban areas in the future.

Our green roof solar research is financed by Smart Oslo and RFF Oslo. We also have research collaborations with Oslobygg KF, Sempergreen and Eindhoven University of Technology.

Sedum green roof with vertically mounted bifacial solar panels

Methods and main findings

The "green effect" on solar production

Our first vertical solar panel installation on a green roof was installed in 2022 on Løren school in Oslo. Our results show good energy yield.

The green roof gives higher albedo than a conventional flat roof and a cooling effect that increases the energy production.

The green roof has withstood extended dry periods, and the sedum shows signs of better growth in the areas underneath the solar panels than beside them.

Measured energy yield from the green roof pilot installation at Løren school in Oslo

Benefits of a green roof

  • Increase water retention and delay stormwater run off
  • Insulate buildings, storing heat in winter and reflecting heat in summer
  • Decrease surrounding temperatures, which will increase PV efficiency
  • Help biodiversity, especially pollinators
  • Bind CO2 and local air pollution
Close-up of sedum vegetation growing beneath vertical solar panels

The future of sustainable urban rooftops

Utilizing urban areas to the fullest will play a large part in the mitigation of climate change and its effects. We believe vertical solar provides a unique opportunity to effectively deploy green roofs and solar panels using the same area.

We believe the results gathered at our research installations will contribute important information for the increasing focus on sustainable urban rooftops.

VPV units for green roofs
Urban green roof combined with a vertical solar installation

Get in touch

Contact us if you have an interest in a collaboration on vertical bifacial solar installations.