Serbia’s battery storage market is moving from an early-stage development pipeline toward contracted grid access, with around 2 GW of battery energy storage projects now covered by connection agreements. At the same time, roughly 11 GW of wind and solar capacity remains in the transmission connection process, highlighting the growing importance of flexibility as renewable generation expands across the regional electricity market.
Transmission system operator EMS said it has signed grid-connection agreements covering approximately 2 GW of battery energy storage, marking a significant step for Serbia’s emerging storage sector.
The figure suggests that a substantial share of the country’s previously announced battery pipeline has progressed beyond preliminary planning and into a more concrete stage of securing access to the transmission network.
The development comes as the commercial case for battery storage becomes increasingly visible.
EPS trading executive Davor Pupovac said the Serbian utility purchased substantial volumes of electricity at negative prices during April and May, illustrating how rising renewable generation is already creating periods when electricity supply exceeds immediate demand.
This is precisely the market environment in which batteries can create value.
Storage systems can charge when electricity prices are very low or negative and discharge when demand increases and prices recover. The resulting time arbitrage allows battery operators to capture the difference between surplus and scarcity periods.
Traditional arbitrage faces increasing pressure
The changing market structure is also creating new challenges for conventional electricity traders.
Pupovac said CBAM-related changes and regional electricity surpluses are affecting market liquidity and reducing some traditional cross-border arbitrage opportunities.
That points to a broader structural shift in the way electricity is traded in Southeast Europe.
Serbia is rapidly adding solar and wind capacity, while Hungary, Romania, Bulgaria and Greece are also expanding renewable generation. As these markets develop increasingly similar generation profiles, periods of very low or negative prices can occur across several countries simultaneously.
When surplus electricity appears across an entire region, simply moving power from one country to another can become less valuable.
Instead, shifting electricity from one hour to another can provide a more attractive source of value.
This changes the commercial hierarchy of the electricity market.
Cross-border transmission capacity remains essential, but time arbitrage is becoming increasingly important alongside geographic arbitrage.
Batteries are particularly well suited to this role because they can respond quickly to changes in market conditions.
Storage can also provide balancing services, while helping renewable generators manage periods of curtailment and weak capture prices when solar and wind output is high.
2 GW connection pipeline signals market maturity
The approximately 2 GW of battery projects covered by connection agreements should not, however, be interpreted as 2 GW of storage capacity that is guaranteed to reach operation.
Developers will still need to secure financing, procure equipment, satisfy market-access requirements and reach final investment decisions. Some projects may ultimately be delayed, resized or cancelled.
Nevertheless, the connection agreements represent an important development milestone.
They indicate that Serbia’s battery market is moving beyond a pipeline dominated by preliminary announcements and toward projects with a clearer route to grid access and eventual construction.
The development is also taking place alongside a much larger pipeline of renewable generation.
With around 11 GW of wind and solar capacity still progressing through the transmission connection process, the need for flexibility is likely to increase as more intermittent generation enters the system.
Serbia’s first phase of renewable development focused primarily on adding generation capacity.
The next phase will increasingly depend on how the system manages large volumes of electricity arriving at the same time.
That is where battery storage can become strategically important: not simply as another source of capacity, but as infrastructure that can shift electricity across time, support system balancing and help turn periods of renewable oversupply into a source of market value.
