The so called energy transition (Energiewende) is entering a new stage. The old regime primarily focused on the incentive to build renewable power generation and to make these generation technologies competitive. The next step is to make renewable power generation fit into the power supply system. Beside the known challenge of how to deal with a lack of electric power, a totally new phenomenon has to be dealt with: What to do with the huge amount of excess power?
Given that the volatility of power generation will increase dramatically, there are four fields where action is indispensable. The power grids must be extended. Additional back up power plants are necessary and have to be adjusted to their new purpose. Power storage systems must be installed. And finally a demand side management will be inevitable. The grid must become smart.