The European Commission has initiated a significant acceleration of the electricity grid expansion across Europe, a move that is poised to reshape energy dynamics, particularly in South-East Europe (SEE). This initiative aims not only to modernize the grid but also to address critical market challenges such as high energy prices, the integration of renewable energy sources, and reducing reliance on external suppliers. By enhancing cross-border capacity and alleviating congestion, this strategy is set to transform how electricity is priced, financed, and traded in SEE, ultimately linking national systems more closely with the broader European market.
Central to this initiative is the expectation that electricity demand across Europe will surge by approximately 60% by 2030. This increase is driven by factors such as the rise of electric vehicles, heat pumps, data centers, and the electrification of various industrial processes. In SEE, where transmission infrastructure is often outdated and cross-border capacity is limited, this growing demand presents a unique challenge. The region’s lower transmission density means it is particularly sensitive to these changes compared to core EU areas.
The economic implications of congestion costs are significant. In 2022, these costs across Europe were around €5.2 billion and are projected to escalate to approximately €26 billion annually by 2030 if not addressed. In SEE, these costs manifest indirectly through issues like renewable energy curtailment and emergency imports at unfavorable prices. Enhancing grid infrastructure can mitigate these distortions by facilitating the flow of surplus power from generation areas to regions with deficits, thereby stabilizing prices and reducing financial risks.
The European Commission’s focus on developing energy highways holds particular importance for the Balkans. These corridors aim to eliminate critical bottlenecks that hinder renewable energy from reaching consumption centers. This shift elevates SEE from a collection of isolated national grids into an integral part of the EU internal electricity market. The region’s hydropower resources, coastal wind zones, and rapidly expanding solar capabilities can only realize their full economic potential if they can be effectively transmitted across borders.
A key element in this transformation is the Trans-Balkan Electricity Corridor. This coordinated effort involves establishing a 400 kV backbone that connects Serbia, Montenegro, Bosnia and Herzegovina, Croatia, Hungary, and Romania. Notable components include the 109 km Obrenovac–Bajina Bašta line in Serbia, scheduled for completion around 2027, along with additional extensions towards Bosnia and Montenegro expected by 2028. These developments will significantly enhance regional trading capabilities and facilitate better integration with Central European power flows.
The structural market consequences are profound. As interconnection capacity increases, volatility in electricity prices is expected to diminish. Historically, SEE markets have experienced extreme price fluctuations during cold winters or dry periods; however, improved cross-border capacities can help stabilize these extremes. Enhanced interconnections allow for excess generation to be exported rather than curtailed and help moderate pricing during supply shortages. Over time, this will narrow the price gap between SEE hubs and Central European benchmarks.
The Adriatic interface exemplifies this growing interdependence. The existing high-voltage direct current (HVDC) link between Italy and Montenegro operates at 500 kV with a capacity of 600 MW and has already influenced regional trading dynamics. Plans for a second cable aim to double this capacity to 1,200 MW with an estimated investment of €500 million targeted for commissioning around 2031. This development positions Montenegro as a crucial conduit between SEE generation assets and the Italian market; however, its success hinges on the EU grid’s ability to accommodate these increased flows.
Additionally, the planned second Italy–Greece interconnector (GRITA 2), which will have a capacity of up to 1,000 MW over approximately 300 km at an investment cost near €2 billion, will further alter congestion patterns across South-East Europe and the Mediterranean region. Although it does not traverse the Western Balkans directly, its influence on price signals in interconnected markets is expected to be significant.
These transmission investments align with the Commission’s broader strategy to enhance renewable energy integration in SEE. The region still possesses substantial untapped hydroelectric, wind, and solar resources; however, existing grid limitations have constrained their deployment. Expanding grid infrastructure reduces curtailment risks and improves market conditions for financing renewable projects as revenue risks become more aligned with market fundamentals rather than structural limitations.
The grid expansion agenda also intersects with industrial electrification trends as EU policies push sectors like steel and chemicals toward electricity-based processes. The reliability of cross-border supply becomes increasingly important for competitiveness in these industries. SEE’s advantages—such as legacy hydro capacity—are amplified when coupled with dependable import/export capabilities during peak demand periods.
Moreover, enhancing security of supply introduces another layer of complexity. While reducing dependence on external energy sources does not equate to national self-sufficiency, it fosters greater mutual reliance within Europe. Stronger interconnections facilitate shared system stress rather than isolated crises. For governments and state-owned utilities in SEE, this reduces the likelihood of emergency measures that could strain fiscal health.
In summary, the European Commission’s grid expansion initiative effectively reconfigures SEE’s energy landscape from a volatile peripheral market into a vital contributor to Europe’s overall energy stability and flexibility. With existing capacities like the Adriatic link set to expand significantly alongside new interconnections planned for completion between 2024 and 2028, operational execution will be critical moving forward. Regulatory alignment and coherent market rules must evolve alongside infrastructure improvements to fully realize integration benefits for South-East Europe.
