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The new fish pass will be realised in accordance with the following schedule:


  • 17 October 2022 Start of the construction work
  • Preparation of construction site, creation of temporary storage areas and topsoil removal
  • Probing of pipelines, dismantling of the old foundations, start of the excavation work, construction of the intake structure and relocation of numerous pipelines


  • April 2023: Start of the main construction phase for the bypass watercourse
  • October: Installation of weir turbine
  • December: Completion and commissioning of the fish pass


  • Impact monitoring

The cost of the fish pass

In total, Alpiq Hydro Aare AG is investing approximately 16 million Swiss francs in the construction of the fish pass. However, the federal government reimburses the costs from the grid surcharge fund, which means that the upgrading of the fish pass at the Flumenthal power plant will be funded by all electricity consumers via the electricity price.