The value of battery storage in Southeast Europe depends on the business model and net revenue, not simply on average power prices or installed capacity. This can lead investors, lenders and portfolio owners to favour different markets.
Batteries earn revenue from hourly price differences and system services, meaning average day-ahead prices do not indicate the earnings potential of each usable megawatt-hour. Investors need to account for volatility, competition, grid charges, fees, degradation and access to balancing services. The relevant measure is revenue per usable MWh after these costs.
Installed capacity varies widely across the region. Hungary had 1,053.4 MW of grid-scale battery capacity listed at 1 October, compared with 1,162 MW and 2,312 MWh of storage capacity in Romania on the same date. Bulgaria’s fleet exceeded 6.2 GW and 19 GWh in the latest estimates, although its scale also brings intense competition for arbitrage.
Market conditions and business models
Romania combines a rapidly expanding storage fleet with merchant and balancing opportunities, as well as a non-recourse precedent that may improve its appeal to banks. Hungary’s growth is backed by market reform and a large solar base. Bulgaria’s scale and mature dispatch experience may suit portfolio owners pairing storage with large solar assets.
Serbia’s operating storage fleet is smaller than those in the other markets discussed, while greater price volatility may create wider scarcity margins because flexibility is less available. Standalone projects in Serbia also face greater regulatory and financing uncertainty. A pure merchant trader may favour a less saturated market, whereas a portfolio owner may place more value on Bulgaria’s solar assets and dispatch experience.
Market rankings can change according to the business model and the costs of accessing each market. Before choosing a location, investors should model the same battery configuration in each market using identical technical assumptions. The analysis should cover competition, fees, degradation and access to balancing services, rather than rely on average spot prices or capacity totals.
