It is the supply of electricity to a user that has not concluded an electricity purchase contract. In such situations, the final guaranteed supply ensures the continuity of electricity supply. Users that have not chosen an electricity trader will receive electricity within the framework of the final guaranteed supply until the time when they conclude a contract with an electricity trader. 

The price of the final guaranteed electricity supply for users whose electrical facilities are connected to the distribution system is the average weighted price of the electricity exchange in the settlement period which is published on the internet site of the electricity exchange and to which a surcharge determined by the final guaranteed supplier is added.