Ambitious goal achieved in two main stages
The Wollerau Corporation used to pump an average of 480,000 m3 of groundwater from the shores of Lake Zurich uphill to the supply area. This required around 750 MWh of energy per year. Measures defined in the GWP 2012 were intended to change this. These included the commissioning of the Geissboden treatment plant, which is located above the supply area. The Geissboden plant extracts groundwater from a confined aquifer without using any energy. This saves approximately 550 MWh of pumping energy per year. The higher altitude of the Geissboden plant can also be used to generate 250 MWh of energy per year by means of two drinking water turbines on the way to the main supply area. In net terms, the Wollerau Corporation now produces around 50 MWh of electricity per year.
