As Europe advances its battery storage initiatives, Southeast Europe (SEE) is emerging as a significant frontier for energy storage development. This shift is driven by structural grid constraints, an increasing pipeline of renewable energy projects, and regulatory reforms aligned with EU standards. Countries such as Serbia, Montenegro, North Macedonia, Bosnia and Herzegovina, Albania, and Romania are beginning to deploy large-scale Battery Energy Storage Systems (BESS), despite being at an early stage compared to more mature markets in Western Europe.
While the European Union aims for a target of 200 GW of storage capacity by 2030, SEE countries may present unique opportunities due to their less saturated markets. The region could potentially offer higher arbitrage spreads and ancillary service premiums attributed to lower system flexibility and thinner balancing markets. This contrasts with established markets like the UK and Italy, where long-term capacity mechanisms provide revenue stability.
In Serbia, the rapid expansion of solar and wind energy is occurring under state-backed procurement and private Power Purchase Agreements (PPAs). However, the transmission operator EMS faces challenges related to balancing complexity as renewable generation increases. Consequently, price volatility between peak and off-peak hours is widening, creating favorable conditions for profitable storage arbitrage.
Montenegro shares a similar situation with its reliance on large hydro resources while simultaneously increasing wind energy penetration. The stability of its electricity system is increasingly contingent upon regional interconnections and balancing imports. As integration with the European market coupling framework deepens, the transmission of volatility from Central Europe is expected to enhance intraday price spreads in Montenegro, thus creating additional value for storage solutions.
Romania stands out as the most developed BESS market within SEE. Supported by significant renewable energy growth and funding from the EU Recovery and Resilience Facility, Romania has initiated storage-linked auctions and grant frameworks. This positions the country closer to a contracted model akin to Western Europe. For regional developers, Romania serves as a financing benchmark due to lenders’ greater willingness to support BESS projects compared to those in less stable environments further south.
The cost landscape for battery storage in SEE benefits from decreasing capital expenditures across Europe, now averaging €90–110 per kWh for utility-scale systems. However, grid connection constraints pose significant challenges. Many SEE grids were originally designed for centralized thermal and hydro generation rather than distributed renewable sources paired with storage solutions. Factors such as connection capacity limitations and reactive power requirements can substantially impact project feasibility.
The capital structure in SEE differs markedly from that of Western Europe. In contracted markets, projects can achieve 60–70% non-recourse debt leverage at competitive rates. In contrast, lenders in SEE often demand stronger balance sheets or partial guarantees due to regulatory uncertainties and evolving balancing market rules. This results in a higher weighted average cost of capital but also leaves room for attractive equity returns when market volatility supports revenue generation.
Three key structural shifts highlight the strategic importance of integrating SEE into Europe’s broader battery storage landscape. Firstly, the region is witnessing a steep growth phase in renewable energy adoption driven by commitments to decarbonization. Secondly, tighter integration with continental European markets will likely import price volatility that enhances the potential for monetizing storage assets. Lastly, ongoing EU accession processes are gradually standardizing balancing markets and ancillary service procurement frameworks.
While SEE does not yet offer a fully de-risked environment for contracted storage investments, it presents high-volatility opportunities for disciplined project structuring and proactive engagement with grid operators. The next five years will be critical in determining whether SEE transitions into a secondary wave of battery storage expansion in Europe. If regulatory clarity improves and grid reinforcement aligns with renewable energy growth, the region could evolve from opportunistic merchant plays toward more structured and bankable storage portfolios.
