Directive 2009/28/EC on the promotion of renewable energy sources (RES) was adopted in 2009. The RES Directive establishes a common framework for the promotion of renewable energy in the European Union. Due to the complexity and variety of issues addressed by the RES Directive, various mechanisms are required to support its implementation. The RES Directive benefits from a structured dialogue (Concerted Action) between the participating countries, as well as from common approaches and solutions. The Concerted Action (CA-RES II) supports the RES Directive and the achievement of national targets and contributes to the overall fulfillment of the EU's energy goals.