Southeast Europe is seeing higher volatility, a more renewable-driven generation mix and greater exposure to intraday trading signals, while market liquidity remains uneven. Week 21 highlighted a gap between large exchanges such as Italy’s IPEX and smaller regional platforms including SEEPEX, where traded volumes are shallow. The contrast points to differences in how much trading activity each venue supports.
Across the week, Italy traded around 20,800 GWh. Greece recorded 3,480 GWh, Bulgaria 2,370 GWh, Hungary 2,340 GWh, and Serbia’s SEEPEX only 130 GWh. The distribution of volumes underscores the scale of liquidity variation within the region.
Liquidity depth and price formation in renewable-heavy systems
In a market with high renewable penetration, price discovery relies on deep participation, active intraday adjustment and reliable balancing signals. When liquidity is thin, prices can become more volatile and spreads can widen. Hedging also becomes more difficult for producers, traders and industrial buyers.
For Serbia, the low traded volume on SEEPEX is described as a structural limitation. The market can still provide clear price signals, but it does not offer the same depth as larger European exchanges. This has implications for renewable bankability because lenders and investors need confidence in both average prices and the ability to hedge merchant exposure.
The same liquidity issue extends to industrial power purchase agreements. Exporters exposed to CBAM may seek long-term renewable contracts, but pricing those contracts requires credible market references. With a shallow exchange, it becomes harder to structure bankable offtake terms such as floor prices, balancing clauses and indexed supply agreements.
Venue roles across Central Europe and the Balkans
Hungary’s HUPX is positioned as a regional benchmark due to stronger liquidity and its location between Central Europe and the Balkans. Italy is described as the premium market on account of scale, structural import dependence and high gas exposure. Serbia, Bulgaria and Croatia are still developing the liquidity needed to fully monetize renewable-related price movements.
This matters as solar output rises across the region. In Week 21, regional photovoltaic generation increased by 8.1%, while thermal generation fell by 5%. More solar can translate into greater intraday price movement.
Without deeper intraday and balancing-market liquidity, participants cannot manage that volatility efficiently. The availability of liquid trading venues and balancing signals is therefore linked to how participants respond to changing generation patterns.
Implications for hedging, storage revenues and market design
The investment focus highlighted in the data links market design to commercial outcomes alongside generation buildout. Southeast Europe is described as needing stronger exchange liquidity, improved intraday coupling, deeper balancing markets and more transparent congestion pricing. Otherwise, renewable expansion may progress faster than the commercial infrastructure required for bankability.
For traders, thin liquidity is presented as both an opportunity and a risk. It can widen spreads and sharpen price movements while also increasing execution risk. Large positions may be harder to hedge or unwind during stressed system conditions.
For storage investors, liquidity is also central because a BESS project depends on capturing price spreads. If intraday and balancing markets remain shallow, the technical value of storage may not translate into reliable revenue. Week 21 is used to illustrate that Southeast Europe’s next energy-market challenge includes building trading depth alongside renewables and interconnectors.
