Montenegro is moving to reinforce its role within the Western Balkans electricity system, with the Crnogorski elektroprenosni sistem (CGES) and the European Bank for Reconstruction and Development (EBRD) agreeing on a €15 million investment to upgrade a key cross-border transmission line linking Bosnia and Herzegovina, Montenegro and Albania.
The financing—structured as an EBRD-backed loan—targets the modernization of a 220 kV transmission corridor, one of the most important regional interconnection routes. The project focuses on the axis Trebinje – Perućica – Podgorica – Vau i Dejes, effectively forming a backbone for electricity flows across the Western Balkans.
At the core of the upgrade is a technical intervention with immediate system impact. Existing conductors will be replaced with high-temperature low-sag (HTLS) conductors, enabling significantly higher transmission efficiency and resilience under peak load conditions.
This modernization is expected to double the transmission capacity of the line from around 300 MW to approximately 600 MW, materially improving cross-border electricity flows and system stability.
From a system perspective, the project is less about incremental improvement and more about unlocking regional flexibility. The Western Balkans power system remains structurally fragmented, with limited cross-border capacity often constraining trade, balancing and renewable integration. By strengthening this corridor, the project directly enhances interoperability between national grids, allowing more efficient dispatch and reducing congestion risks.
The investment also reflects a broader shift in EBRD’s regional strategy, where grid infrastructure is increasingly prioritised alongside generation assets. Transmission constraints have emerged as one of the key bottlenecks for scaling renewable energy across Southeast Europe, particularly as solar and wind capacity accelerate in Serbia, Bosnia and Herzegovina and Albania.
For Montenegro, the project reinforces its position as a transit and balancing node within the regional electricity market. The country already plays a strategic role due to its interconnections and hydropower assets, and additional transmission capacity strengthens its ability to facilitate cross-border energy flows, especially during seasonal imbalances.
The financing structure includes a state guarantee provided by Montenegro’s Ministry of Finance, underlining the strategic importance of the asset and aligning the project with sovereign-backed infrastructure priorities.
Beyond national benefits, the implications for Bosnia and Herzegovina are equally significant. Increased transmission capacity enables higher export potential, particularly for surplus generation from coal and hydropower plants, while also improving security of supply during demand peaks or system stress events.
At a regional level, the project contributes to a longer-term objective: the gradual integration of Western Balkan electricity markets into the broader European system. Enhanced interconnection capacity is a prerequisite for market coupling, balancing market development and alignment with EU energy frameworks.
The €15 million investment itself is modest relative to the scale of generation CAPEX currently emerging across the region. However, its system value is disproportionately high. Transmission upgrades of this type often deliver outsized returns in system efficiency, reducing curtailment, enabling cross-border arbitrage and supporting the integration of variable renewable energy.
As renewable pipelines continue to expand—particularly in solar and wind—the importance of such grid reinforcements is only set to increase. Without parallel investment in transmission, generation growth risks being constrained by bottlenecks, undermining both project economics and system reliability.
In that context, the CGES–EBRD project signals a more coordinated infrastructure approach across Southeast Europe: one where grid expansion and regional connectivity are treated as foundational layers of the energy transition, rather than secondary considerations.
