According to the definition contained in Article 2 point 15a of the RES Act, it is a civil law agreement, which may include natural entities, legal entities, scientific units, research institutes or local government units, regarding generation and balancing demand, distribution or trade in energy from renewable energy sources or from other sources or fuels.

Electronic System of Information Transfer enabling immediate transmission and publishing of information that results from the obligations indicated in the law. The system is administered by the KNF.