Montenegro’s electricity transmission system is entering a new investment phase after the European Bank for Reconstruction and Development (EBRD) approved financing to strengthen one of the country’s key cross-border power corridors. The investment focuses on upgrading an existing high-voltage line operated by Crnogorski Elektroprenosni Sistem (CGES), Montenegro’s transmission system operator, with the objective of increasing regional electricity transfer capacity and supporting the integration of renewable generation across Southeast Europe.
The project will be financed through a sovereign-guaranteed loan of up to €15 million, part of a total investment estimated at €16.95 million. The financing will enable CGES to modernize the 220 kV Trebinje – Perućica – Podgorica – Vau i Dejës transmission line, a critical electricity corridor linking Bosnia and Herzegovina, Montenegro and Albania. Once completed, the upgrade will significantly expand the corridor’s operational capacity, enabling the line to carry around 600 MW of electricity, roughly double the current transmission capability of approximately 300 MW.
Rather than constructing new infrastructure, the project relies on replacing existing conductors with High Temperature Low Sag (HTLS) technology, a modern transmission solution that allows substantially higher electricity flows through the same physical corridor while maintaining safe operating conditions. The approach reduces environmental impact and investment costs while delivering a meaningful increase in cross-border electricity transfer capacity.
The corridor itself plays an important role in the regional power system. Stretching across Montenegro from the Bosnia and Herzegovina border through the Perućica hydropower complex and the Podgorica substation before reaching Albania, the line forms part of a wider Western Balkans electricity network that facilitates cross-border trading and system balancing. Strengthening this route is expected to improve system resilience and allow transmission operators to manage electricity flows more efficiently during periods of renewable generation volatility.
Montenegro’s electricity system is undergoing structural changes as renewable capacity expands across the region. Neighboring countries including Albania, Bosnia and Herzegovina and Serbia are developing new wind and solar projects, while Montenegro itself has been gradually increasing renewable investments through projects such as the Krnovo and Možura wind farms and several emerging solar developments. As the share of weather-dependent generation rises, grid infrastructure capable of absorbing fluctuations and transferring electricity across borders becomes increasingly important.
By expanding the transmission capacity of the Trebinje–Perućica–Podgorica–Vau i Dejës corridor, the upgrade will facilitate larger cross-border flows between the Western Balkans markets. The improvement is expected to reduce congestion in the regional transmission network, allowing electricity to move more freely between systems when supply conditions differ. This flexibility is particularly valuable during periods of high renewable output or sudden declines in wind and solar production.
The financing structure reflects the typical model used by international financial institutions to support strategic infrastructure projects in the Western Balkans. The EBRD loan carries a maturity of approximately twelve years, including a two-year grace period, and is backed by a sovereign guarantee from the Government of Montenegro. The interest rate is linked to six-month Euribor plus around one percentage point, aligning the project with the standard financing framework applied to transmission system operators in emerging European markets.
The project also highlights the role of CGES as a central actor in Montenegro’s electricity sector. The transmission operator manages a network of around 1,512 kilometres of transmission lines operating at 400 kV, 220 kV and 110 kV voltage levels, supported by 55 transformer units with a combined transformation capacity of approximately 4,166 MVA. Through these assets, CGES connects Montenegro’s electricity system with neighbouring grids in Serbia, Bosnia and Herzegovina, Albania and Kosovo, while also operating the strategic subsea interconnector linking Montenegro to Italy’s electricity system.
That submarine cable, which connects the Montenegrin coast to the Italian grid across the Adriatic Sea, represents one of the most important electricity interconnections between Southeast Europe and the European Union. By strengthening the domestic transmission network feeding into this corridor, investments such as the Trebinje–Perućica–Podgorica–Vau i Dejës upgrade indirectly enhance the region’s ability to trade electricity with Western European markets.
For the EBRD, the project forms part of a broader investment strategy focused on improving energy infrastructure, increasing renewable energy integration and strengthening electricity market connectivity across the Western Balkans. The bank has played a prominent role in financing energy projects in Montenegro, ranging from renewable generation developments to grid digitalisation and regulatory reforms supporting electricity market liberalisation.
Although the transmission upgrade represents a relatively modest investment in financial terms, its strategic impact lies in its contribution to regional electricity integration. As renewable generation capacity continues to expand across Southeast Europe, the ability to move electricity efficiently between national markets will become increasingly important for maintaining system stability and controlling price volatility.
The Western Balkans power system is progressively evolving from a group of largely national electricity markets into a more interconnected regional network linked to the European Union. Transmission projects such as this one illustrate how infrastructure investments are gradually aligning the region’s electricity systems with the operational and market structures of the broader European power market.
In practical terms, strengthening Montenegro’s transmission corridor improves the physical backbone of this integration process. Higher transfer capacity between Bosnia and Herzegovina, Montenegro and Albania will enable system operators to balance supply and demand more effectively while facilitating cross-border electricity trading across the Adriatic-Balkan corridor.
As the region prepares for a decade of accelerated renewable deployment and growing electricity demand, grid infrastructure will increasingly determine how efficiently power systems can integrate new generation assets. The EBRD-backed upgrade of Montenegro’s transmission corridor therefore represents a small but strategically important step in reinforcing the infrastructure needed to support the Western Balkans’ evolving electricity market.
