Project 142 - CSE 4 (2nd BG-GR interconnector and South BG corridor)

The project concerns the construction of a new AC 400kV interconnection between and and new AC 400kV overhead linesat the south part of Bulgaria. This project will increase cross border transfer capacity between Bulgaria and Greece and contribute to the safe evacuation of renewable power in the area.

Classification Mid-term Project Boundary North-South PCI label 3.7.11

Promoted by ESO;IPTO-SA

Investments GTC Evolution Investment Contribution Substation Substation Present Commissioning since Description Evolution Driver ID 1 2 Status Date TYNDP 2014 New interconnection line Maritsa BG-GR by a 130km N.Santa Delayed due to lack of 256 100% East 1 Permitting 2021 Delayed single circuit 400kV OHL. (GR) funding. (BG)

New 100km single circuit Maritsa Delayed due to difficulties 400kV OHL in parallel to Design & 257 100% East 1 2019 Delayed with the acquisition of the the existing one. (BG) Permitting (BG) land

New 13km single circuit Maritsa Maritsa Delayed due to difficulties 400kV OHL in parallel to Design & 258 100% East 1 East 3 2017 Delayed with the acquisition of the the existing one. Permitting (BG) (BG) land

New 400kV OHL. Line Maritsa Delayed due to difficulties Design & 262 length 150km. 100% East 1 2021 Delayed with the acquisition of the (BG) Permitting (BG) land

Additional Information

- Project website ESO (http://projects.eso.bg/maritsa-east-nea- santa/?en#PROJECT%20OF%20COMMON%20INTEREST)

- Project website IPTO (http://www.admie.gr/en/transmission-system/system-development/projects-of-common- interest/project/article/2194/) Project 142 includes a new interconnection between Bulgaria and Greece and relevant reinforcements in the 400kV network at the south part of Bulgaria. The later are necessary in order to alleviate congestions in the area of south Bulgaria that are restricting power exchanges through the new interconnector. Investment needs

The project 142 aims to increase the transfer capacity in the predominant North-South direction by the construction of a new interconnector between BG and GR and specific enhancements in the South part of the 400kV Bulgarian transmission system.

Project will increase transmission capacity in range of 660-870 MW for dominant direction from north (RO+BG) to south (GR), or in average for 80%. GTC on the boundary considered will reach up to 1000 MW in 2030.

In opposite direction, GTC increase is in range 0-400 MW, or in average for 30%. GTC on the boundary considered will reach up to 650 MW in 2030.

Project 142 support market integration in mid-term, 2020EP, and brings significant benefit to SEW of near 30 MEUR.

On a long-term, largest benefits on SEW appear mainly in Vision 2, as can be seen in the Figure below that depicts SeW:ΔGTC ratios for the 2030 Visions.

Project Cost Benefit Analysis

This project has been assessed by ENTSO-E in line with the Cost Benefit Analysis methodology, approved by the EC in February 2015.

The indicators B6/B7 reflect particular technical system aspects of projects based on a summation of qualitative performance indicators, in line with the CBA methodology; these cannot be used as a proxy for the security of supply indicator.

The assessment of losses variations induced by the projects improved in the TYNDP 2016 compared to the TYNDP 2014 with a comprehensive all year round computations on a wide-area model capturing all relevant flows.

The results must however be considered with caution and not totally reliable due to their very high sensitivity to assumptions regarding the detailed location of generation which are not secured. General CBA Indicators Delta GTC contribution (2020) [MW] GR-RO,BG: 0 RO,BG-GR: 650 Delta GTC contribution (2030) [MW] GR-RO,BG: 400 RO,BG-GR: 850 Capex Costs 2015 (M€) 188.2 ±10 Source: Project Promoter Here are given estimated CAPEX for investments clusterd in the project 142: Investment 256: 400 kV OHL Maritsa East 1 (BG) - Nea Santa (GR) : 66.2 MEUR Investment 257: 400 kV OHL Maritsa East 1(BG) - Plovdiv (BG): 46 MEUR Investment 258: 400 kV OHL Martitsa East 1(BG)- Maritsa East 3 (BG): 11 MEUR Cost explanation Investment 262: 400 kV OHL Maritsa East 1 (BG) - Burgas (BG): 65 MEUR OPEX are not inlcuded in the listed costs. OHL costs deviate depending on terrain, while SS costs vary depending on arrangement of bubars and switchyards. Uncertainty ranges about 10% of CAPEX. S1 15-50km S2 Negligible or less than 15km B6 + B7 ++

Scenario specific CBA indicators EP2020 Vision 1 Vision 2 Vision 3 Vision 4

B1 SoS (MWh/yr) N/A N/A N/A N/A N/A B2 SEW (MEuros/yr) 30 ±10 20 ±10 30 ±10 <10 10 ±10 B3 RES integration (GWh/yr) <10 <10 <10 30 ±10 80 ±20 B4 Losses (GWh/yr) 0 ±25 0 ±25 -75 ±25 -175 ±25 0 ±25 B4 Losses (Meuros/yr) 0 ±1 0 ±1 -4 ±2 -11 ±2 0 ±2 B5 CO2 Emissions (kT/year) 500 ±80 400 ±100 400 ±100 ±100 ±100

All the projects of CSE Region contribute to the reduction of generation cost in Europe that is reflected in SeW values for the examined scenarios. In EP2020, Vision 1 and Vision 2, transfer capacity increase brought by new projects, assists market integration internally in the Region and with the rest of Europe. SeW is created due to the capability to increase the generation of low cost thermal production in the Balkan peninsula with an associated increase in CO2 emissions. In Visions 3 and 4, SeW is created mainly because of the increased RES penetration brought by new projects and is accompanied by a corresponding CO2 reduction.