RES-E Integration in Germany using the example of EnBW TSO

In Germany, the four transmission system operators (TSOs) are in charge of integrating the intermittent electricity production from renewable energy sources (RES-E). EnBW Transportnetze AG (EnBW TNG) is responsible for the market integration of about 14 % of the RES-E production in Germany. This paper describes the integration of RES-E at EnBW TNG, the TSO in the southwest of Germany. The basic idea of most of the described processes is common to all German TSOs. In the beginning, the framework of the Renewable Energy Sources Act (EEG) and the horizontal exchange of RES-E between the four German grid control areas are explained briefly. Then the different activities for market integration and balancing of RES-E are described in more detail. This will include all major processes in the different market segments like day ahead, intraday and balancing markets as well as the latest developments in forecasting systems. The focus of the paper is to report practical experiences.