The 400 kV OHL Lastva-Čevo project includes the construction of two 2x400 kV and 400 kV transmission lines about 35 km long, which would connect the Lastva substation to the electric power system of Montenegro by integration into the existing 400 kV OHL Podgorica-Trebinje and connection to the Pljevlja substation by construction of the 400 kV OHL section Lastva – Pljevlja from Lastva Grbaljska to Čevo.
The project is being implemented complying with the obligations under the Project Coordination Agreement on the connection of the electric power systems of Italy and Montenegro, as well as the need for the 110 kV transmission network not to be a "bottleneck" in the implementation of development plans for both the littoral and the north of Montenegro.
The aim of the project is to build energy infrastructure in the territory of Montenegro, which will provide conditions for connection of the electric power systems of Italy and Montenegro, reduce the problem of energy supply at the transmission level on the coast of Montenegro, provide connection of SS Žabljak and SS Brezna to the 110 kV voltage level, thereby improving the security of power supply to consumers in the north of Montenegro. All of the above will make the electric power system of Montenegro more stable and reliable and reduce the impact of neighboring electric power systems in case of major disturbances.
Project implementation includes the following sub-projects:
- SS 400/110/35 kV Lastva (2x300 MVA);
- OHL 400 and 2x400 kV OHL Lastva-Čevo;
- OHL 400/400 + 110 kV OHL Čevo-Pljevlja.
The main project benefits are:
- fulfillment of the n-1 security criterion in case of 500-1000 MW transit via undersea cable;
- reliable power supply of consumers in the coastal area of Montenegro;
- better voltage-reactive conditions;
- connection of the interconnection link between Montenegro and Italy by means of the undersea cable;
- load shedding of transmission capacities towards the coast;
- better voltage-reactive conditions in the 400 kV network of Montenegro;
- reduction of losses in the transmission network (through greater utilization of the 400 kV network);
- bidirectional power supply of SS Brezna and SS Žabljak.
The total planned value of the project is about € 106 million.
With regard to the 400 and 2x400 kV OHL Lastva-Čevo, the preparatory activities were completed, as well as the selection of the contractor Iberdrola – Spain, project design and revision, equipment delivery and 98% of the works. The 2x400 kV transmission line was completed and has been in temporary operation, while the 1x400 kV transmission line was completed up to the next to the last tensile tower (the last tensile bay is awaiting the resolution of one property issue).
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CBA Indicators/Project
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SS 400/110 kV Lastva, 400 kV OHL Lastva - Čevo and Čevo – Pljevlja
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B1.
Higher security of power supply
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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.
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B2.
Social and economic benefits (mil€)
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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.
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B3.
RES integration
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It allows the construction of SS 400/110/35 kV Brezna to which HPP Komarnica (172MW) and WPP Krnovo (72MW) is to be connected.
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B4.
Variation in losses (GWh)
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Annual loss reduction by 52.643 GWh (about 1.621 mil €).
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B5.
Variation in CO₂ emission (%)
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In case of construction of renewable sources (172+72 MW), the use of thermal units and CO2 emission are expected to decline.
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B6.
Technical resilience/system security
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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.
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B7.
Flexibility
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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.
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Grid transfer capacity (GTC)
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The value is increased by approximately 500 MW.
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