Producer - produces electricity from various sources - conventional or renewable and sells it to electricity traders and end customers.
Electricity trader (supplier) - a company holding a license to purchase electricity from producers and / or traders and subsequently resell it to the customers at freely negotiated market prices.
Balancing group coordinator - a licensed company, present in the register of coordinators of balancing groups of ESO, which is responsible for maintaining the supply balance throughout all sites of the trade participants, which are members of its balancing group. The electricity trader acts as a coordinator of a balancing group.
Independent Transmission Operator (ESO EAD) - a licensed company, operator of the electricity transmission network and the electricity system of Bulgaria. ESO performs centralized operational management and controls and coordinates the organization of the electricity market, including the balancing energy market.
Electricity distribution network operator - a licensed company which provides electricity distribution & maintenance as well as development & management of the power grid.
Power exchange operator - organizer of the power exchange market, which administers the transactions on the power exchange market and is also a party to the contracts.
Supplier of last resort (SLR) - a licensed company providing electricity supply when the consumer is left without a supplier on the liberalized market or a circumstance occurs, which leads to his trader being unable to ensure the continued supply of electricity.
Consumer (end customer) - a household or business (non-household) customer who has entered a contract for the supply of electricity by freely negotiating the prices with a selected by him trader of electricity.