Negative electricity prices have been recorded in Serbia following changes to the SEEPEX market. The introduction of negative pricing is tied to adjustments aimed at bringing Serbia’s organized market closer to European standards. SEEPEX said the move is intended to support preparation for integration into the EU coupled market.
SEEPEX introduced negative prices in May 2026. The day-ahead market floor was set at -€500/MWh, while the intraday market floor was set at -€9,999/MWh. SEEPEX stated that the change was designed to align Serbia’s organized market with European standards.
First negative trades on SEEPEX
The first negative day-ahead price on SEEPEX was recorded on 10 May 2026. It covered delivery between 14:00 and 15:00, when the market cleared at -€0.01/MWh. Later in May, the intraday continuous market also recorded negative trades.
In the intraday continuous segment, negative trades were reported with a volume-weighted average price of -€8.83/MWh. The figure related to one delivery hour during May. These early records show that pricing below zero has entered both day-ahead and intraday trading on SEEPEX.
How negative prices arise in power systems
Negative prices occur when there is more electricity available than can be absorbed economically within a given interval. The conditions can include low demand, strong renewable generation, inflexible thermal output, limited exports, or grid congestion. In a functioning market, negative prices are described as a signal rather than an operational failure.
The signal described for market participants is that the system requires flexibility. For Serbia and the wider Western Balkans, this is presented as new territory for how surplus conditions can appear in pricing. The region’s prior power-market focus has included coal availability, hydro conditions, regulated prices, import dependence, and regional shortages.
EU alignment and policy implications
The Energy Community Secretariat described SEEPEX’s move as progress under the Electricity Integration Package. It also linked the change to aligning Serbia’s market with EU requirements. The Secretariat said negative prices help expose oversupply and can support incentives for flexibility and storage.
It also noted that negative pricing can steer investment toward system needs. In this context, allowing prices below zero is described as improving visibility of stress that would otherwise be hidden by a zero price floor. When prices cannot fall below zero, the market may not reflect how inflexibility affects value across intervals.
Impact on renewables, trading and flexible demand
For renewable developers, the introduction of negative-price capability affects assumptions about revenue from produced energy. Solar projects in Serbia and neighboring markets may need approaches such as storage, curtailment strategy, flexible offtake, or power purchase agreements that allocate negative-price risk clearly. The change is therefore relevant to how midday generation is valued under surplus conditions.
For traders, negative prices increase the value of intraday optimization. Forecasting becomes more important across solar output, demand, interconnector availability, and plant flexibility. The market focus shifts toward hourly and sub-hourly positioning rather than only baseload exposure.
For industrial consumers, negative prices are described as potentially beneficial for entities with shiftable demand. Examples listed include cold storage, water pumping, electrolysis, data centers, and other flexible processes that can consume during surplus hours. Such participation depends on contracts that pass through relevant price signals and operational systems capable of responding.
Next steps for market development
For policymakers, SEEPEX’s negative prices are described as a market-design milestone for Serbia’s alignment with European rules. The next steps identified include building liquidity and improving balancing markets. Enabling storage, strengthening cross-border trading, and moving toward market coupling are also cited as priorities.
The introduction of negative pricing is therefore positioned within an ongoing transition toward a more sophisticated electricity trading framework in the Western Balkans region. Negative prices are presented as part of that transition rather than an isolated change in pricing mechanics.
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