By late 2026, Bulgaria’s battery-storage capacity exceeded 6.2 GW and 19 GWh, putting it ahead of other Southeast European markets on operating scale, according to a regional market assessment. The assessment compares operating capacity, bankable financing precedents, policy support and grid access rather than ranking markets by investment returns.
Operating capacity and financing
Bulgaria’s storage growth is supported by recovery-plan funding, merchant projects and a rapidly growing solar fleet. Romania combines an established operating base with a financing precedent and public support: it had 1,162 MW and 2,312 MWh of battery storage in operation as of 1 October.
Romania’s position is also underpinned by non-recourse battery-storage financing at Scornicesti and a EUR 150 million support call from the Modernisation Fund. Hungary had more than 1 GW of grid-scale battery capacity recorded in October, following strong commissioning in 2026.
Greece added two large operating references in October. The 330 MW / 790 MWh Larissa battery and the 100 MW / 200 MWh HELLENiQ project both entered service.
Policy support and grid access
Serbia has around 2 GW of reported storage connection agreements, and SEEPEX now permits negative prices. Evening electricity scarcity can be severe, but Serbia still needs more operating standalone batteries and financing precedents, leaving a gap between connection agreements and operating capacity.
Croatia’s EU-level pledge points to an additional 500 MW / 1,000 MWh of storage by 2028. Its operating fleet remains much smaller than those in the leading markets, despite the policy ambition.
Montenegro is moving toward a strategic-partner model around a 60 MW / 240 MWh reference project. North Macedonia has a state-backed 100 MW / 400 MWh battery project valued at EUR 98 million. Albania’s Erseke development combines 75 MWp of solar capacity with 40 MWh of storage. The three markets are earlier-stage but strategically relevant.
Different risk and revenue profiles
Mature markets offer clearer rules but face more competition. Earlier-stage markets can offer wider spreads, alongside greater regulatory and financing risk. The comparison therefore reflects differing combinations of operating scale, bankability and access, not a simple return ranking.
For investors, the choice depends on whether they seek merchant optionality, contracted cash flow or strategic first-mover exposure. The market trade-off is lower regulatory risk but greater competition in mature markets, versus wider spreads and higher risks in less mature ones.
