From the latest 10 years, European electricity markets are facing new and hard challenges that force the TSOs to re-consider the organization of the network and markets. In this sense the European Union Agency for the Cooperation of Energy Regulators (ACER) released the First Edition of the Bidding Zone Review, a work focuses on studying the impact of Bidding zones configuration on network security and market efficiency, trying to obtain the better configuration for the future. The new capacity allocation method, the flow-based market coupling, started in CWE region, and the continuous growth of renewable penetration has a huge impact on the formation of zones.