The landscape of battery storage in Europe is evolving, with a significant focus on South-East Europe (SEE) as a promising frontier for energy storage solutions. This shift is driven by structural grid challenges, a surge in renewable energy projects, and regulatory reforms aligned with EU objectives. As the region begins to deploy large-scale Battery Energy Storage Systems (BESS), it presents unique opportunities that diverge from the more saturated markets in Western Europe.
Current projections indicate that core EU markets are aiming for a total of 200 GW of storage capacity by 2030. In contrast, SEE countries—including Serbia, Montenegro, North Macedonia, Bosnia and Herzegovina, Albania, and Romania—are still in the initial stages of BESS implementation. Despite this nascent phase, these countries may experience more favorable arbitrage spreads and ancillary service premiums compared to their Western counterparts due to lower system flexibility and less developed balancing markets.
In established markets like the UK and Italy, long-term capacity mechanisms provide revenue stability; however, SEE predominantly operates under merchant-driven models. The rapid expansion of renewable capacity in Serbia—primarily through solar and wind projects supported by state procurement and private Power Purchase Agreements (PPAs)—is outpacing necessary grid enhancements. This imbalance is leading to increased price volatility between peak and off-peak hours, which is essential for effective storage arbitrage.
Montenegro shares similar characteristics, where its traditional reliance on hydroelectric power is being complemented by growing wind generation. The stability of its energy system increasingly hinges on regional interconnections and balancing imports. As cross-border trading becomes more integrated within the European market coupling framework, it is anticipated that volatility from neighboring regions will enhance intraday price spreads in Montenegro, further establishing a value proposition for storage solutions even before formal remuneration mechanisms are in place.
Among SEE nations, Romania stands out as the most advanced market for battery storage development. Backed by substantial renewable growth and support from the EU Recovery and Resilience Facility, Romania has initiated storage-linked auctions and grant programs. This positions it closer to the established European model of contracted energy systems, making it an attractive benchmark for financing BESS projects compared to other nations in the region.
From a cost perspective, battery capital expenditure (CAPEX) across Europe has seen a decline, currently ranging between €90–110 per kWh for utility-scale systems with two-hour discharge capabilities. However, the primary challenge in SEE lies not with battery costs but rather with grid connection limitations. Many existing grids were designed with centralized thermal and hydro power plants in mind rather than accommodating distributed renewable resources alongside storage solutions. Consequently, factors such as connection capacity constraints and reactive power requirements can significantly impact project feasibility.
The financial landscape in SEE also contrasts sharply with Western Europe’s capital structure environment. While contracted markets typically allow for 60–70% non-recourse debt leverage at competitive rates, lenders in SEE often seek stronger sponsor balance sheets or additional guarantees due to ongoing regulatory uncertainties. This results in a higher weighted average cost of capital but also opens avenues for greater equity Internal Rate of Return (IRR) when market volatility is favorable.
Three key structural shifts are shaping the relationship between Europe’s battery mosaic and SEE: First, renewable energy penetration is entering a critical growth phase across the region. Projects involving wind energy in Serbia and Montenegro alongside large-scale solar initiatives underscore the increasing demand for flexible assets that can stabilize the grid rather than merely serve as tools for arbitrage.
Second, enhanced regional market coupling with continental Europe will likely introduce increased volatility into local markets. As electricity exchanges within SEE align more closely with Central European counterparts, price signals will reflect broader EU supply-demand dynamics more effectively—potentially amplifying intraday spreads that could benefit storage monetization strategies.
Lastly, ongoing processes related to EU accession are gradually standardizing balancing markets along with ancillary service procurement frameworks and grid codes within SEE countries. As these regulatory frameworks mature over time, there exists potential for a transition from purely merchant models toward hybrid or contracted structures that could improve overall bankability.
In conclusion, while South-East Europe currently does not offer a fully de-risked environment for contracted energy storage solutions, it presents an early-cycle opportunity characterized by high volatility. Developers who strategically structure projects alongside renewable installations while engaging proactively with grid operators may unlock significant returns compared to more mature Western markets. The next five years will be pivotal in determining whether SEE transitions into a secondary wave of battery storage expansion across Europe.
