Serbia’s power exchange SEEPEX introduced negative electricity prices for delivery from 6 May 2026, adding a new market signal for flexibility. SEEPEX market data recorded both negative prices during surplus hours and prices above EUR 300/MWh during scarcity in 2026. The wider range of outcomes has implications for renewable generators and investors assessing storage alongside generation.
The first negative day-ahead clearing price was recorded on 10 May 2026 for the 14:00–15:00 delivery hour. It cleared at -EUR 0.01/MWh, with 673.4 MWh traded. The first negative intraday trades followed later in May, with a volume-weighted average price of -EUR 8.83/MWh for one delivery hour.
Prices later rose above EUR 300/MWh. On 30 October 2026, SEEPEX baseload reached EUR 303.29/MWh and peakload EUR 331.30/MWh. Trading volumes on the exchange in October were above half a terawatt-hour.
The contrast between spring surplus signals and autumn scarcity highlights a broader role for storage than supporting renewable generation. Negative prices can increase the value of flexible charging, but those hours remain limited and can be unpredictable. Buying electricity only when prices are negative is therefore not a durable commercial strategy for developers, according to the market dynamics described by SEEPEX’s 2026 price data.
Storage can instead manage a portfolio across day-ahead, intraday and balancing markets, with batteries available to respond when the market moves away from the central forecast. Negative prices also expose fixed-output renewable projects to capture-price risk. A co-located or contracted battery can protect some of that downside for renewable projects.
Serbia’s first year of negative prices has strengthened the investment case for storage while raising the analytical standard for renewable projects financed without storage. The price swings underline that developers must assess both the potential value of flexible charging and the exposure of fixed-output generation to changing market prices.