The simple tie-line decomposition method – a new approach for a causation based cost-sharing key

The European electricity system is highly meshed on the transmission level and its operation has become more complex and largely influenced by wide-area phenomena, which may impact the network of several Transmission System Operators (TSO). The high penetration of renewable energy sources (RES) and corresponding dispersed and intermittent generation, which combined with the difficulty to build new assets to increase transmission capacity, results in operating the Transmission System with increased uncertainty and closer to its stability limits under high stress conditions.