Climate change is the most challenging task in these days. One part of the solution is to reduce CO2 output in the energy sector. The energy demand of the future will be covered by electrical power production from renewable sources. This means that the fluctuating sources wind and photovoltaics will play a major role in future systems. Integrating these sources comes with several challenges from identifying the resources, technical integration questions up to the task to harmonize power production and demand over time, space and energy sectors like power, heat, transport and industrial demand. Starting with meteorological issues up to information and communication the course gives an overview over the whole range of questions to ask in these different aspects.