Hydropower contributes a little more than half the electricity produced Switzerland with a share of 56% of the overall energy supply. In turn half of the available energy can be stored in reservoirs and called upon when needed. Energy Strategy 2050 makes provision for a 5-8% increase in generation from hydropower. At the same time the effects of climate change, increased requirements for water protection and the European electricity market impact the domestic hydropower in many ways. Additionally, concessions for existing hydropower plants will have to be renewed in the coming decades. As a result of this situation there are many problems which have to be studied for which solutions will have to be found to be able to use hydropower sustainably and economically in the future.