The "Glarnerland" sewage treatment plant is also an energy park


Wastewater Association Glarnerland




817.9 kWp

The “Glarnerland” sewage treatment plant is also an energy park

The Glarnerland sewage treatment plant wants to become an energy park. As part of the ongoing overall renovation and to increase the degree of self-sufficiency, the HORIZON solar folding roof was implemented and officially put into operation on 26 January 2021.

Excerpt from the protocol of the municipality meeting on the credit application: “(…)The solar folding roof is considerably cheaper than a fixed system, and it also offers more flexibility with regard to future basin installations. The basins and their maintenance are not hindered by the system, and any necessary renovations do not require dismantling. The investment costs would be comparatively low and the solution would be very space-saving.”

The folding solar roof floats over an area of 5,600 m2 above the biology/post-treatment basins and the pre-treatment/rainwater basins. With 817.9 kWp of installed capacity and a yield of 700 MWh, the folding solar roof in Bilten is the largest project completed to date. In combination with the already existing combined heat and power plant, the entire WWTP is self-sufficient in terms of energy balance.


The folding solar roof enables the Glarnerland wastewater association to have a self-sufficient power supply. It also makes an ecological contribution and is cost-neutral.

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