Bulgaria Advances in Solar Energy Storage with Private Investment-Backed Battery Systems
Sofia, The Gulf Observer: Bulgaria has taken a notable step in transforming its energy sector by beginning large-scale storage of solar energy in batteries through private investments. This development marks a milestone in the country’s transition toward sustainable energy solutions.
According to Angelin Tsachev, Executive Director of the Electricity System Operator (ESO), operational data published on the ESO website indicates that approximately 200 megawatts of energy are currently being charged into these battery systems. Nationwide, around 500 megawatts of battery capacity have been installed, offering a combined storage potential of nearly 1,300 megawatt-hours.
ESO has also received connection applications for almost 12,000 megawatts of capacity and 35,000 megawatt-hours of proposed storage. These projects are subject to review by a technical council to ensure compliance with operational standards and safety requirements.
Currently, battery storage meets roughly 1.5% of Bulgaria’s daily electricity needs. However, Tsachev noted in a recent interview with the Bulgarian National Radio that this share is expected to increase significantly in the coming months. Projections suggest that installed battery capacity could soon reach between 7,000 and 10,000 megawatt-hours, making it a major component of the national energy system.
Tsachev also highlighted that ESO is not authorized to own solar energy storage facilities, and currently, no state-owned or private conventional power plants in Bulgaria operate with battery storage systems.
Adjustments to the balancing methodology for intermittent energy sources have improved operational discipline among commercial operators, easing concerns over grid stability. Tsachev pointed out that Bulgaria is now ranked among the top five European countries for balancing performance under these standards.
The nation’s growing renewable capacity has also contributed to increased electricity exports. In the first seven months of this year, Bulgaria achieved a positive export balance of nearly 230,000 megawatt-hours compared to the same period last year, signaling deeper integration into regional energy markets.
