The departure from fossil fuels and the massive expansion of wind and solar plants is only one side of the coin when it comes to the future of the grids. The other is that at the same time the demand for electricity is rising rapidly. Not only because mobility and heat are becoming electric, but also because more and more people need electricity to live: According to UN forecasts, the world's population will rise to around 10 billion by 2060. But if more electricity is to flow, we need more lines and larger transformers.