Serbia’s battery market is moving from development pipeline into contracted grid access, with about 2 GW of storage projects now covered by connection agreements as negative prices, renewable surpluses and CBAM begin reshaping the economics of regional electricity trading.
Transmission operator EMS said it has signed grid-connection agreements covering around 2 GW of battery energy storage, while roughly 11 GW of wind and solar capacity remains in the transmission connection process.
The figure is significant because it suggests a large part of Serbia’s previously identified battery pipeline has advanced beyond preliminary development into a more concrete grid-access phase.
The shift comes as the commercial case for storage is strengthening.
EPS trading executive Davor Pupovac said the Serbian utility bought substantial volumes of electricity at negative prices during April and May, highlighting how expanding renewable output is already creating periods when generation exceeds immediate demand.
That is precisely the environment in which batteries gain value.
Storage can absorb electricity when prices are extremely low or negative and discharge it later when the market tightens, monetising the spread between surplus and scarcity hours.
Traditional arbitrage under pressure
The market is also becoming more complex for conventional electricity traders.
Pupovac said CBAM-related changes and regional electricity surpluses are affecting liquidity and reducing some traditional cross-market arbitrage opportunities.
That suggests storage is becoming part of the response to a deeper structural shift.
Serbia is adding solar and wind rapidly, while neighbouring Hungary, Romania, Bulgaria and Greece are doing the same. As renewable production becomes increasingly synchronised, cheap electricity can appear across several markets at once.
In that environment, simply moving electricity from one country to another may generate less value than shifting electricity from one hour to another.
That changes the commercial hierarchy of the market.
Cross-border transmission remains important, but time arbitrage becomes increasingly valuable alongside geographic arbitrage.
Batteries are well suited to that model.
They can also provide balancing services and support renewable developers facing curtailment or weak capture prices during high-output periods.
The roughly 2 GW under connection agreements should not be interpreted as 2 GW of batteries certain to be built.
Financing, equipment procurement, market-access rules and final investment decisions will still determine how much capacity reaches operation.
But the connection milestone shows Serbia’s storage market is moving closer to execution.
The country spent the first phase of its renewable transition adding generation.
The next phase will increasingly be about what happens when too much electricity arrives at the same time.