1. “Electricity System Operator” EAD S tate and Prospects for Development of the Bulgarian Electrical Power System Ventsislav Zahov, Head of Electrical Regimes Dept. at the National Dispatching Center

2. 2 The Bulgarian ELECTRICITY SYSTEM OPERATOR company performs the control of the national electrical power system, the common parallel operation with the power systems of the other ENTSO-E Member parties, provides the operation, the maintenance and the development of the electricity transmission network and administrates the electricity market

3. 3 Electricity generation in Bulgaria during the last years Year Year 20072008200920102011 2012 2013 2014 2015 Generation, GWh 43 093 44 831 42 573 46 260 50 700 47 195 43 649 47 408 49 233 Demand, GWh 35 555 36 390 34 842 36 647 38 589 37 510 36 381 37 069 37 958 Export, GWh 7 538 8 441 7 731 9 613 12 111 10 660 6 225 9 525 10 538

4. 4 Share of the power plants in the electricity generation in 2015 Type of generation GWh NPP 15 381 Lignite TPP 21 736 Hard coal TPP 971 Gas TPP 1 867 Pumped storage 509 HPP 5 704 Wind farm 1 468 Photovoltaics 1 391 Biomass206 Total: 49 233

5. 5 Installed capacities by the end of 2015 Type of generation MW NPP2000 Lignite TPP 4199 Hard coal TPP 708 Gas TPP 799 HPP3198 Wind farm 702 Photovoltaics1041 Biomass64 Total: 12711

6. 6 Registered limit values of the load during the last years Year 2013 2013 2014 2015 2016 (by May) RegimeMax.Min.Max.Min.Max.Min.Max.Min. Date 09.01. 06.05. 31.12. 22.06. 01.02.25.04. 04.01. 24.05. Hour19:0005:0019:00 06:00 20:0005:00 19:00 04:00 Load, MW 6672 2 210 7 106 2 656 7 100 2 759 7 105 2 662

7. 7 At normal (fully operational) network configuration, the electricity transmission network is in a technical state to implement the transmission of the planned electricity quantities, in order to supply the consumers in the country, as well as to carry out the export and the transit towards the neighboring countries. The operational voltages can be controlled within the admissible limits by the available technical means. State of the electricity transmission network

8. 8 There are difficulties in carrying out the maintenance program for the electricity transmission network, due to the following reasons:  Increased loading of the TPPs at the Maritsa Basin, due to the decommissioning of Units 1-4 of Kozloduy NPP and Units 1-6 of Varna TPP;  Lack of around-the-clock industrial load;  Displacement of the household load towards the big cities;  Significant seasonal increase of the loads in the resorts;  Relocation of the RES generation towards the inland;  Increased transit and loop flows of electricity through the Bulgarian electricity transmission network. State of the electricity transmission network

9. 9 Planned development of the electricity transmission network by the year 2022: –Construction of a new 400kV interconnection power line between Bulgaria and Greece, from s/s Maritsa East (Galabovo) to s/s Nea Santa; –Doubling the 400kV ring in the direction s/s Plovdiv – s/s Maritsa East – Maritsa East 3 TPP – s/s Burgas; –Doubling the 400kV ring in the direction s/s Burgas – s/s Dobrudzha/Varna. Development of the electricity transmission network

11. 11 Planned development of the electricity transmission network by the year 2025: –Construction of a new 400kV interconnection power line between s/s Vetren and s/s Blagoevgrad; –Construction of a new 400kV interconnection power line between s/s Tsarevets (Veliko Tarnovo) and s/s Plovdiv. Development of the electricity transmission network

12. 12 Thank you for your attention !