Austria’s Renalfa IPP has started commercial operation at its 25 MW/55 MWh battery energy storage system (BESS) located in the city of Razlog, southwestern Bulgaria.
The system, which is connected to the transmission network and located alongside a 33 MW solar plant, successfully went live at the start of the month. Renalfa IPP said the facility is the largest operating BESS system in Bulgaria and one of the first of such scale in Eastern Europe.
The facility is being managed and optimized by KER Toki Power, a fully digital Bulgarian electricity trader. The system participates in capacity and balancing markets via the trader’s platform, providing automatic Frequency Restoration Reserve (aFRR) and manual Frequency Restoration Reserve (mFFR) services to the grid.
