The project of construction of SS 400/110/35 kV Lastvaincludes the construction of 2x300 MVA substation and extension of the existing substation 400/220/110 kV Pljevlja 2. The project is implemented in compliance with the obligations set forth by the Project Coordination Agreement on the interconnection between the electric power systems of Italy and Montenegro, so that the 110 kV transmission network is not a “bottleneck” in the implementation of development plans of both the coastal area and the northern area of Montenegro.
In progress are construction works, installation and testing of equipment. The project is in the development phase of the main design and the Contractor is Siemens Austria. The project objective is to construct the electric power infrastructure on the territory of Montenegro, which would create conditions for connecting the electric power systems of Italy and Montenegro, alleviate difficulties in electricity delivery at the transmission level in the coastal area of Montenegro and ensure connection of SS Žabljak and SS Brezna at 110 kV voltage level, thereby improving security of power supply to the consumers of the northern area of Montenegro. This would make the electric power system of Montenegro more stable and reliable reducing the impact of neighboring electric power systems in case of huge disorders.
The project implementation includes the following subprojects:
- SS 400/110/35 kV Lastva (2x300 MVA);
- OHL 400 and 2x 400 kV OHL Lastva-Čevo;
- OHL 400/ 400+110 kV OHL Čevo-Pljevlja.
The main project benefits are:
- fulfilling n-1 security criterion in case of 500-1000 MW transits via submarine cable;
- reliable power supply of the consumers in the coastal area of Montenegro;
- improving voltage and reactive conditions;
- connecting the interconnection between Montenegro and Italy by submarine cable;
- load-shedding of transmission capacity in the coastal area;
- improving voltage and reactive conditions in the 400 kV network of Montenegro;
- reducing losses in transmission network (by higher utilization of 400 kV network);
- providing double-sided power supply of SS Brezna and SS Žabljak.
The estimated value of the entire project is about 105 million € and the project completion is planned in 2016.
The construction of the 400/110/35 kV substation “Lastva” has been completed. After successfully completing functional tests in temporary operation and a technical inspection, the facility was issued an operating permit in accordance with legal regulations and put into permanent operation. As part of CGES’s campaign called “Our Olive Tree,” the open area around the facility was enhanced by planting eight hundred olive saplings. This campaign will continue throughout 2020.
CBA Indicators/Project | SS 400/110 kV Lastva, 400 kV OHL Lastva - Čevo and Čevo – Pljevlja |
| B1.Higher security of power supply | Undelivered energy is estimated at about 2.13 GWh (due to the non-construction of SS Lastva)+7.06 GWh (non-construction of OHL 400 kV Lastva-Pljevlja), which amounts to about 6.9 mil€ annually. |
| B2.Social and economic benefits (mil€) | It allows market coupling between Italy and Southeast Europe with the full capacity of 1000 MW of DC cable, thereby increasing the benefits of electricity producer. |
| BetterRES integration | It allows the construction of SS 400/110/35 kV Brezna to which HPP Komarnica (172MW) and WPP Krnovo (72MW) is to be connected. |
| Before fourVariation in losses (GWh) | Annual loss reduction by 52.643 GWh (about 1.621 mil €). |
| B5.Variation in CO₂ emission (%)₂ (%) | In the event of the construction of renewable sources (172+72 MW), a reduction in the operation of thermal units and a decrease in CO is expected.2 |
| B6.Technical resilience/system security | This project significantly improves technical resilience of the system when major disturbances occur (e.g. an outage of 400 kV switchyard at SS Podgorica 2 or outages of 110 kV grid in the coastal area). OHL 400 kV Lastva – Pljevlja allows maximum delivery through the cable towards Italy. Closing the ring in the 400 kV grid increases the security of the system operation and resolves the previous problem of parallel operation of 400 kV and 220 kV grids. |
| B7.Flexibility | Even without the full utilization of the cable, the security of energy supply and system operation is increased. The Strategy goal of closing the 400 kV ring in Montenegro is achieved. The project is flexible because it retains the benefits in various scenarios of transmission grid development. |
| Grid transfer capacity (GTC) | The value is increased by approximately 500 MW. |
