Elektroenerigen Sistemen Operator

Elektroenerigen Sistemen Operator (ESO) is the owner and operator of the country's high and medium voltage electricity transmission grid spanning some 15 130 km.

ESO holds a license for electricity transmission, including the coordination of special balancing groups for a period of 35 years, granted in December 2013. ESO administers the balancing market for electricity, which was launched on 1 June 2014, holds tenders for transmission capacity and provides the centralised dispatching of the national electric power generation system.

All electricity generators and their customers in Bulgaria use ESO's transmission system. All network users connected directly to the grid pay an initial connection fee and transmission tariffs, which are determined by the State Energy and Water Regulatory Commission (SEWRC). The Bulgarian transmission network is also connected to the neighbouring systems of Greece, Romania, Turkey, Serbia and Macedonia. The transmission system operators of neighbouring countries coordinate the allocation and use of available transmission capacities through periodic auctions for capacity.

To view the company's financial statements, please go to Financial reports.

For more information please visit www.tso.bg.