Bulgaria’s operating battery fleet was reported at 6.23 GW of power and more than 19 GWh of energy by late October, marking a shift from negligible grid-scale storage to a core operating asset. The reported figures are exceptionally large for the country and should be checked against underlying ESO or market data.
Reported solar capacity was 7.3 GW, implying an unusually high ratio of battery power to photovoltaic capacity. Calculations cited for October 1 to 25, with no year specified, indicate batteries supplied 18 GWh per day and absorbed 19.9 GWh per day. The figures and their time aggregation were flagged for verification against the system’s size.
Tenevo debt backs new battery
The European Bank for Reconstruction and Development (EBRD) and Raiffeisen are providing €60 million in debt financing for a new battery at the Tenevo complex in Bulgaria. The project has a power capacity of 246 MW and an energy capacity of 512.5 MWh.
The new battery is next to a 242 MWp solar plant. An existing battery at the complex has a power capacity of 65 MW and an energy capacity of 260 MWh. The project adds scale to a site that already combines merchant solar generation and battery storage.
More storage in Bulgaria could absorb midday solar generation, reduce the severity of negative prices, release energy during evening peaks and provide balancing services. Greater capacity could also change cross-border power flows into Romania, Greece, Serbia and North Macedonia. As storage penetration rises, arbitrage spreads are expected to compress, pushing developers toward more sophisticated revenue stacking.