Slovenia has opened its wholesale electricity market to competing exchange operators, allowing Nord Pool and Croatia’s CROPEX to compete with incumbent BSP SouthPool. The arrangement could affect trading services, market-access costs and operational risk management across Southeast Europe. It introduces competition between exchanges without dividing Slovenia’s wholesale electricity price formation.
Three exchanges serve Slovenia’s bidding zone
The Multi-NEMO Arrangement has been operational since October 21, allowing three nominated electricity-market operators to offer day-ahead trading services in the same Slovenian bidding zone. It operates under Europe’s integrated market-coupling framework, with all three exchanges participating in the common European day-ahead coupling process. They compete for customers through their platforms, membership arrangements, fees and related services.
Slovenian transmission system operator ELES said on October 23 that implementation followed extensive regulatory, technical and contractual coordination. The work 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 provider for Slovenia’s organised day-ahead market, and participants seeking access to Slovenian auction liquidity relied principally on its infrastructure and membership arrangements.
The new system offers a choice of service provider while retaining participation in the European Single Day-Ahead Coupling (SDAC) mechanism. Under SDAC, bids submitted through different nominated exchanges are combined in a common market-coupling calculation, so participants can use different operators without creating separate national wholesale price-setting systems. Competition between exchanges does not automatically reduce the wholesale electricity price paid by Slovenian consumers, but it can affect service costs and quality, operational arrangements and access to multiple national markets.
Exchange fees, collateral and customer services in focus
For electricity traders, suppliers, industrial consumers and generators, the change creates an opportunity to review exchange membership, clearing, collateral requirements and trading infrastructure. The costs of organised-market participation extend beyond the electricity purchase price: companies also need exchange memberships, trading accounts, collateral arrangements, information-technology interfaces and systems for physical and financial settlement. They also bear the costs of compliance, market reporting, risk controls and integrating exchange transactions with internal trading systems.
The reform gives exchanges scope to compete over these services and creates several potential models for regional market access. A trader already using CROPEX in Croatia could assess whether accessing Slovenia through the same exchange reduces additional administrative or technical requirements. A company active in several European markets could similarly consider Nord Pool’s wider geographical coverage and technology infrastructure.
BSP SouthPool retains an established position in Slovenia and is connected to wider regional electricity-market cooperation through ADEX, involving Slovenia, Hungary and Serbia. Traders must compare membership fees, transaction charges, clearing relationships, collateral treatment and operational requirements to determine whether consolidating activity with one provider would reduce costs. Any economic benefit is not automatic.
Collateral can be particularly important because electricity-trading companies often need substantial financial resources to support exchange positions. Where clearing arrangements allow collateral to be managed more efficiently, a company may reduce the liquidity tied up in market participation. However, the Slovenian Multi-NEMO reform does not create a common collateral pool across all three exchanges; potential savings depend on each participant’s clearing and contractual arrangements. Such differences can have commercial significance for companies with constrained working capital.
Euronext links physical trading with financial services
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 other European markets, starting with Germany in April 2027.
The strategy seeks to build a broader electricity-market infrastructure business connecting physical transactions, risk management and financial trading. For market participants, this could eventually offer opportunities to simplify access to related physical and financial products. The Slovenian launch does not itself provide integrated futures contracts, common collateral or new hedging instruments for Slovenian electricity.
Instead, Nord Pool can extend its physical-market customer relationships as Euronext develops complementary financial services. CROPEX is pursuing a different expansion model by extending an established regional exchange into a neighbouring national market. The two approaches reflect competition moving beyond domestic market operation towards regional customer acquisition and broader trading-service provision.
Multiple operators add options but not shared infrastructure protection
ELES has also presented the reform as a way to strengthen the resilience of electricity-market operations. The transmission operator said that allowing several exchanges in one bidding zone could reduce operational risks linked to market disruptions and decoupling events, which can carry significant financial consequences for system operators. Interruptions to organised electricity 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. They do not remove risks affecting shared infrastructure: a failure of the common European market-coupling algorithm could still disrupt trading on several exchanges at once.
The operational issue therefore includes the resilience of trading interfaces, technical connections, clearing arrangements and contingency procedures, not only the number of available exchanges. Larger energy-trading companies may increasingly include exchange selection in formal operational-risk management alongside market-price exposure, credit risk and liquidity requirements. For traders, potential advantages may come from lowering the financial and operational costs of accessing the same market, rather than obtaining a different wholesale electricity price.
Slovenian changes follow regional intraday integration
The Multi-NEMO change followed a 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 took operational responsibility for ADEX’s continuous intraday markets, bringing activities associated with BSP SouthPool, HUPX and SEEPEX into a common technical environment.
The two changes use different approaches to market infrastructure: ADEX is consolidating operational processes across national exchanges, while Slovenia’s Multi-NEMO reform allows several competing operators to serve one national bidding zone. Together, they place exchanges in a landscape where they may cooperate on technology and operations while competing for customers and revenue. The developments 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 competitive pressure on regional exchange services, rather than a direct change to SEEPEX’s domestic market rules. The Slovenian arrangement may nevertheless serve as a reference when assessing the longer-term economics of exchange membership, trading infrastructure and cross-border market access. Competition is extending from electricity transactions to the infrastructure used to execute, clear and manage them.
Intraday expansion planned by the end of 2026
The next step is to extend Slovenia’s Multi-NEMO Arrangement into the Single Intraday Coupling (SIDC) market, with implementation planned by the end of 2026. ELES and CROPEX have both confirmed preparations for the expansion. Intraday access brings additional operational considerations as companies manage changing positions closer to physical electricity delivery.
Technical connectivity, order execution, available trading limits and the reliability of market systems can become increasingly important to operational performance. For exchange operators, the expansion would create another area in which to compete for regional customers. Traders would be able to assess whether a wider choice of exchanges justifies 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 between BSP, CROPEX and Nord Pool. The coming months will be important in assessing whether the reform changes market shares, trading costs and customer behaviour, and Slovenia’s experience could influence how other Southeast European markets assess the commercial organisation of their electricity exchanges.