Slovenia has opened its wholesale electricity market to competing exchange operators, giving Nord Pool and Croatia’s CROPEX the opportunity to challenge incumbent BSP SouthPool. The move could reshape trading services, market-access costs and operational risk management across Southeast Europe.
The new Multi-NEMO Arrangement, which became operational on October 21, allows three nominated electricity-market operators to provide day-ahead trading services within the same Slovenian bidding zone under Europe’s integrated market-coupling framework.
The reform introduces competition between electricity exchanges without splitting Slovenia’s wholesale price formation. All three operators participate in the common European day-ahead coupling process, while competing for customers through their trading platforms, membership terms, fees and related services.
For electricity traders, suppliers, industrial consumers and generators, the change creates an opportunity to reassess exchange memberships, clearing arrangements, collateral requirements and trading infrastructure.
For exchange operators, it signals a broader commercial shift: access to wholesale electricity markets is increasingly becoming a competitive service rather than one tied to a single national exchange.
Three exchanges compete within one bidding zone
Slovenian transmission system operator ELES confirmed on October 23 that the arrangement had been implemented following extensive regulatory, technical and contractual coordination with the Slovenian Energy Agency, BSP SouthPool, CROPEX, Nord Pool and European market-coupling participants.
Nord Pool, owned by pan-European exchange group 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, enabling existing and new members to access both Croatian and Slovenian bidding zones through its services.
The significance extends beyond the arrival of two additional trading platforms.
Before the reform, BSP SouthPool was the established provider for Slovenia’s organised day-ahead market. Participants seeking access to Slovenian auction liquidity primarily relied on its infrastructure and membership arrangements.
The new framework gives market participants a choice of service providers while preserving access to the European Single Day-Ahead Coupling (SDAC) mechanism.
Under SDAC, bids submitted through different nominated electricity-market operators are integrated into a common market-coupling calculation. Traders can therefore use competing exchanges without creating separate national wholesale price-setting systems.
This distinction is important for market economics.
Competition between exchanges does not automatically reduce the wholesale electricity price paid by Slovenian consumers. It can, however, affect the cost, quality and convenience of trading services, as well as the operational arrangements required to access multiple national markets.
Competition shifts towards fees, collateral and customer services
For active electricity traders, participating in organised markets involves much more than paying for the electricity they purchase.
Companies must maintain exchange memberships, trading accounts, collateral facilities, information-technology interfaces and systems for managing physical and financial settlement. They also face compliance, reporting, risk-control and integration costs.
Slovenia’s reform creates scope for exchange operators to compete across these services.
A trader already using CROPEX in Croatia could assess whether accessing Slovenia through the same provider reduces additional administrative or technical requirements. Companies operating across multiple European markets could similarly evaluate Nord Pool’s broader geographical coverage and trading infrastructure.
BSP SouthPool, meanwhile, retains its established position in Slovenia and participates in wider regional electricity-market cooperation through ADEX, which involves Slovenia, Hungary and Serbia.
The result is a more diverse set of options for accessing regional wholesale markets.
However, the financial benefits are not guaranteed. Traders must compare membership fees, transaction charges, clearing arrangements, collateral treatment and operational requirements to determine whether consolidating activity with one provider delivers genuine savings.
Collateral efficiency is particularly important because electricity traders can require substantial financial resources to support their market positions.
Where clearing arrangements enable collateral to be managed more efficiently, companies may reduce the amount of working capital tied up in trading activities. Nevertheless, Slovenia’s Multi-NEMO reform does not itself create a common collateral pool across all three exchanges. Any savings depend on the clearing and contractual arrangements available to individual participants.
For companies operating with limited working capital, these differences can have a material commercial impact.
Euronext expands its electricity-market strategy
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 additional European markets, beginning with Germany in April 2027.
Its broader objective is to build an electricity-market infrastructure business that connects physical transactions with financial trading and risk management.
For market participants, this could eventually make it easier to access related physical and financial products through complementary services.
However, Slovenia’s launch does not automatically introduce integrated futures contracts, shared collateral arrangements or new hedging instruments for Slovenian electricity.
The strategic significance is that Nord Pool can expand its physical-market customer base while Euronext develops complementary financial services.
CROPEX is pursuing a different route to growth by extending an established regional exchange into a neighbouring national market.
These contrasting strategies illustrate how competition between electricity exchanges is moving beyond domestic market operation towards regional customer acquisition and broader trading-service provision.
Trading-system resilience becomes a financial risk consideration
For ELES, the reform is also intended to strengthen the resilience of electricity-market operations.
The transmission system operator said that allowing several exchanges to operate within the same bidding zone could reduce operational risks associated with market disruptions and decoupling events, which can have significant financial consequences for market participants and system operators.
Interruptions to organised electricity trading can expose suppliers and traders to unexpected procurement costs, settlement complications and short-term financial losses.
If a company cannot execute its planned transactions, it may have to adjust its positions through alternative arrangements, potentially at less favourable prices.
Multiple exchange operators provide additional options for accessing trading services and can reduce dependence on a single provider.
They do not, however, eliminate risks associated with shared infrastructure. A disruption affecting the common European market-coupling algorithm could still affect trading across multiple exchanges simultaneously.
The key commercial consideration is therefore not simply how many exchanges are available, but how resilient their trading interfaces, technical connections, clearing arrangements and contingency procedures are.
For larger energy-trading companies, choosing an exchange could increasingly become part of formal operational-risk management, alongside market-price exposure, credit risk and liquidity requirements.
Slovenia’s reform reinforces a wider regional transformation
The development follows another significant change in regional electricity-trading infrastructure.
On October 20, the ADEX Group launched a shared continuous intraday trading environment connecting 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 two developments reflect different approaches to market infrastructure.
ADEX is consolidating operational processes across several national exchanges, while Slovenia’s Multi-NEMO framework allows competing exchange operators to serve the same national bidding zone.
Together, the changes point towards a more complex electricity-trading landscape in Central and Southeast Europe, where exchanges can cooperate on technology and operations while competing for customers and revenue.
The implications extend 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 effect is competitive pressure on regional exchange services rather than a direct change to SEEPEX’s domestic market rules. Nevertheless, Slovenia’s experience could provide a useful reference for evaluating the long-term economics of exchange membership, trading infrastructure and cross-border market access.
Intraday trading is the next competitive test
The next phase is expected 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 confirmed that preparations for the expansion are under way.
Intraday trading introduces additional operational demands because market participants must adjust their positions closer to physical electricity delivery. Technical connectivity, order execution, trading limits and system reliability can therefore have a greater influence on operational performance.
For exchange operators, expansion into the intraday market would create another opportunity to compete for regional customers.
For traders, it would provide a further basis for comparing whether broader exchange choice justifies the associated technical and contractual complexity.
The longer-term outcome will depend on how participants distribute transactions between providers, whether fee competition intensifies and whether clearing and collateral arrangements become more efficient.
There is not yet verified post-launch data demonstrating a measurable redistribution of Slovenian trading volumes between BSP SouthPool, CROPEX and Nord Pool. The coming months will therefore be important for assessing changes in market shares, trading costs and customer behaviour.
Slovenia’s experience could eventually influence how other Southeast European markets approach the commercial organisation of their electricity exchanges.
The immediate takeaway is clear: competition is expanding beyond electricity transactions to the infrastructure used to execute, clear and manage them.
For energy-trading companies, the greatest advantage may not come from obtaining a different wholesale electricity price, but from reducing the financial and operational costs of accessing the same market.
