Slovenia now allows Nord Pool and Croatia’s CROPEX to compete with incumbent BSP SouthPool for wholesale electricity market services. The change could affect trading services, market-access costs and operational risk management across Southeast Europe. Since October 21, the Multi-NEMO Arrangement has enabled three nominated electricity-market operators to offer day-ahead trading in the same Slovenian bidding zone under Europe’s integrated market-coupling framework.
The reform introduces competition between exchange service providers without dividing Slovenia’s wholesale price formation. All three operators take part in the common European day-ahead coupling process, while competing for customers through their platforms, membership terms, fees and related services. Traders, suppliers, industrial consumers and power generators can now reassess their exchange memberships, clearing arrangements, collateral requirements and trading infrastructure.
Market access is increasingly a competitive service rather than an activity reserved for a national electricity exchange. For exchange operators, the arrangement marks a broader commercial shift; for market participants, it offers a choice of providers while retaining access to a common European market.
Three exchanges serve one bidding zone
Slovenian transmission system operator ELES confirmed on October 23 that the arrangement had been implemented after extensive regulatory, technical and contractual coordination. The process involved the Slovenian Energy Agency, BSP SouthPool, CROPEX, Nord Pool and participants in European market coupling. Nord Pool, owned by pan-European exchange operator Euronext, began trading Slovenian day-ahead electricity on October 21 for delivery on October 22, extending its presence to 17 European markets.
CROPEX, which has operated in Croatia for more than a decade, entered Slovenia at the same time. Its services give existing and new members access to both Croatian and Slovenian bidding zones. Before the reform, BSP SouthPool was the established exchange provider for Slovenia’s organised day-ahead market, and participants seeking access to Slovenian auction liquidity principally relied on its infrastructure and membership arrangements.
All three operators participate in the European Single Day-Ahead Coupling (SDAC) mechanism. Under the framework, bids submitted through different nominated exchanges are combined in the common market-coupling calculation, so participants can use competing operators without establishing separate national wholesale price-setting systems. The distinction matters: exchange competition does not automatically reduce the wholesale electricity price paid by Slovenian consumers, but it can affect trading-service costs and quality, operational arrangements and access to multiple national markets.
Fees, collateral and services become competitive factors
Participation in organised markets costs electricity traders more than the purchase price of power. Companies must maintain exchange memberships and trading accounts, arrange collateral, operate information-technology interfaces and manage physical and financial settlement. They also face compliance, market-reporting and risk-control costs, as well as the work of integrating exchange transactions with internal trading systems.
The new arrangement gives exchange operators scope to compete over these services. A trader already using CROPEX in Croatia could assess whether accessing Slovenia through the same provider reduces additional administrative or technical requirements. A company active in several European markets could similarly weigh Nord Pool’s broader geographical coverage and technology infrastructure.
BSP SouthPool retains an established position in Slovenia and is connected to wider regional electricity-market cooperation through ADEX, which involves Slovenia, Hungary and Serbia. The result is a range of models for regional market access, but any economic benefit will depend on the terms available to individual participants. Traders need to compare membership and transaction fees, clearing relationships, collateral treatment and operational requirements before deciding whether consolidating activity with one provider would save costs.
Collateral is a significant consideration because electricity-trading companies often need substantial financial resources to support exchange positions. More efficient collateral management through clearing arrangements may reduce the liquidity tied up in market participation. However, the Slovenian Multi-NEMO reform does not itself create a common collateral pool across the three exchanges; potential savings depend on each participant’s clearing and contractual structures. Those differences can have commercial significance for companies with constrained working capital.
Euronext broadens its energy-market activities
Nord Pool’s entry into Slovenia forms part of Euronext’s Innovate for Growth 2027 strategy, which aims to expand the group’s energy-market activities and geographical reach. The strategy combines physical electricity trading with the development of derivatives and clearing services. Euronext introduced Euronext Nord Pool Power Futures earlier in 2026 and plans to extend its derivatives offering to more European markets, starting with Germany in April 2027.
The group’s stated strategic objective is to build a broader electricity-market infrastructure business linking physical transactions, risk management and financial trading. For market participants, this could eventually create opportunities to simplify access to related physical and financial products. The Slovenian launch does not, by itself, provide integrated futures contracts, common collateral or new hedging instruments for Slovenian electricity.
Nord Pool’s expanded physical-market customer relationships come as Euronext develops complementary financial services. CROPEX is taking a different approach, extending an established regional exchange into a neighbouring national market. The contrast shows how electricity-exchange competition is extending beyond domestic market operation to regional customer acquisition and wider trading-service provision.
Trading-system resilience is a financial risk issue
ELES also sees the reform as a way to strengthen the resilience of electricity-market operations. The transmission operator said that allowing several exchanges to operate in one bidding zone could reduce operational risks linked to market disruptions and decoupling events, which can have significant financial consequences for system operators. Interruptions to organised trading can expose suppliers and traders to unexpected procurement costs, settlement complications and short-term financial losses.
A company unable to execute planned transactions may have to adjust its positions through alternative arrangements, potentially at less favourable prices. Multiple exchange operators provide additional trading-service options and may reduce dependence on a single provider, but they do not remove risks associated with shared infrastructure. A failure affecting the common European market-coupling algorithm could still disrupt trading across several exchanges at once.
The issue is therefore not only how many exchanges are available, but also the resilience of their trading interfaces, technical connections, clearing arrangements and contingency procedures. For larger energy-trading companies, exchange selection could increasingly form part of formal operational-risk management, alongside exposure to market prices, credit risk and liquidity requirements.
Slovenia’s reform follows regional infrastructure changes
The change follows another restructuring of regional electricity-trading infrastructure. On October 20, the ADEX Group launched a shared continuous intraday trading environment linking the Slovenian, Hungarian and Serbian electricity markets. Under the arrangement, BSP assumed operational responsibilities for ADEX’s continuous intraday markets, bringing activities associated with BSP SouthPool, HUPX and SEEPEX into a common technical environment.
The developments represent different approaches to market infrastructure. ADEX is consolidating operational processes across national exchanges, while Slovenia’s Multi-NEMO Arrangement allows several competing exchange operators to serve one national bidding zone. Together, they show a more complex electricity-trading landscape in Central and Southeast Europe, where exchanges may cooperate on technology and operations while competing for customers and revenue.
The changes are relevant to regional trading companies active in Serbia, Hungary, Croatia, Slovenia, Romania and the Western Balkans, particularly those managing portfolios across several wholesale markets. For Serbia, the immediate significance is added competitive pressure on regional exchange services, rather than a direct change to SEEPEX’s domestic market rules. Slovenia’s arrangement may nevertheless serve as a reference for assessing the longer-term economics of exchange membership, trading infrastructure and cross-border market access.
Intraday trading is the next stage
The next step is to extend Slovenia’s Multi-NEMO Arrangement to the Single Intraday Coupling (SIDC) market, with implementation planned by the end of 2026. ELES and CROPEX have both confirmed that preparations are under way. Intraday access brings additional operational considerations because companies must manage changing positions closer to physical electricity delivery.
Technical connectivity, order execution, available trading limits and the reliability of market systems can all become more important to operational performance. For exchange operators, the expansion would add another area of competition for regional customers. Traders will be able to assess whether the advantages of a wider choice of exchanges justify additional technical and contractual complexity.
The longer-term effects will depend on how participants allocate transactions among providers, whether fee competition develops and whether clearing and collateral arrangements become more efficient. No verified post-launch data yet show a measurable redistribution of Slovenian trading volumes among BSP, CROPEX and Nord Pool. The coming months will therefore be important in assessing changes in market shares, trading costs and customer behaviour.
Slovenia’s experience could influence how other Southeast European markets assess the commercial organisation of electricity exchanges. Competition is moving beyond electricity transactions to the infrastructure used to execute, clear and manage them. For energy-trading companies, an advantage may come not from obtaining a different wholesale electricity price, but from reducing the financial and operational costs of accessing the same market.
