Southeast Europe is seeing higher volatility, greater renewable influence and increased exposure to intraday trading signals, while market liquidity remains uneven. Week 21 highlighted a gap between large, liquid trading venues such as Italy’s IPEX and smaller regional platforms including SEEPEX. Traded volumes on the smaller exchange remained shallow.
Italy traded around 20,800 GWh during the week. Greece recorded 3,480 GWh, Bulgaria 2,370 GWh, Hungary 2,340 GWh, and Serbia’s SEEPEX only 130 GWh. The contrast in volumes points to differences in participation depth across markets.
Liquidity effects on price formation and hedging
In a renewable-heavy system, price discovery depends 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 harder for producers, traders and industrial buyers.
For Serbia, the low traded volume on SEEPEX limits how much depth the market can provide compared with larger European exchanges. While the platform can still show clear price signals, it does not offer the same level of trading depth. This can affect renewable bankability because lenders and investors need confidence in both average prices and the ability to hedge merchant exposure.
Implications for long-term contracts and industrial PPAs
The same liquidity challenge extends to industrial PPAs. Exporters exposed to CBAM may seek long-term renewable contracts, but pricing those deals requires credible market references. A shallow exchange makes it more difficult to structure bankable offtake terms.
Such terms include floor prices, balancing clauses and indexed supply agreements. These contract elements rely on market references that reflect trading depth rather than only spot indications.
Benchmarking roles of HUPX and IPEX
Hungary’s HUPX remains a regional benchmark due to stronger liquidity and its position between Central Europe and the Balkans. Italy continues to function as a premium market, supported by scale, structural import dependence and high gas exposure. Serbia, Bulgaria and Croatia are still developing the liquidity needed to monetize renewable-driven volatility.
This development is linked to how quickly markets can support intraday adjustments and balancing outcomes as generation mixes change. The trading depth required for these functions is not uniform across the region.
Solar-driven intraday movement in Week 21
The liquidity question is increasingly tied to solar output growth. In Week 21, regional photovoltaic generation rose 8.1%, while thermal generation fell 5%. Higher solar output increases intraday price movement across power systems.
Without deeper intraday and balancing-market liquidity, participants cannot manage that volatility efficiently. The ability to translate changing generation patterns into stable commercial outcomes depends on market depth as well as generation availability.
Trading depth for traders and storage revenue
For traders, thin liquidity creates both opportunity and risk. It can lead to wider spreads and sharper price movements while also increasing execution risk. Large positions may be harder to hedge or unwind during stressed system conditions.
Liquidity also affects storage economics. A BESS project depends on capturing price spreads, but if intraday and balancing markets are shallow, the technical value of storage may not convert into reliable revenue streams. Week 21 therefore underscores that Southeast Europe’s next market challenge includes building trading depth alongside additional infrastructure.
