The phasing out of nuclear power with electricity from renewable energy sources in return – this is the abridged version of Energy Strategy 2050. However, while this objective can be stated in not so many words, it will have an impact on what is probably Switzerland's largest infrastructure: the electricity grid. With many additional photovoltaic and wind power plants, the dynamics of the Swiss electricity grid will change completely. Where a few central power plants used to provide all the energy, hundreds of thousands of small producers will in future feed electricity into the grid.
This causes two problems for the electricity grid. Firstly, the grid in its current form faced the threat of overload due to overvoltage – especially at midday when the sun is at its highest and many photovoltaic systems feed surplus energy into the grid. Secondly, the current local distribution grids, for example those of residential areas, are not prepared to cope with the larger voltage fluctuations due to the volatile