Launch of the NEMO Transparency Platform: A Step Forward for European Electricity Market Openness

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Launch of a New Transparency Initiative

On 18 December 2025, a group of Europe’s key Nominated Electricity Market Operators (NEMOs) unveiled an ambitious new initiative to elevate transparency across the continent’s short-term electricity markets. The press release, published jointly by GME (Italy), HEnEx (Greece), OKTE (Slovakia), OMIE (Iberian Peninsula), and OTE (Czech Republic), announced the official launch of the NEMO Transparency Platform, a centralised hub for sharing crucial market data in a harmonised and easily accessible way.

Addressing Fragmented Market Data

Historically, results from Europe’s integrated short-term markets, specifically the Single Day-Ahead Coupling (SDAC) and Single Intraday Coupling (SIDC), were published separately by different operators, each with its own format and schedule. This fragmentation made it difficult for traders, analysts, regulators, and other stakeholders to gain a clear and comparative view of price formation, traded volumes, and cross-border market developments. The newly launched platform addresses that gap by consolidating selected results from participating bidding zones, currently the Czech Republic, Greece, Italy, Portugal, Slovakia, and Spain, into a unified public resource.

Transparency as a Market Efficiency Driver

At its core, the initiative is built around a simple but powerful idea: better transparency fosters more efficient, competitive, and trustworthy markets. The press release underscores that the founding NEMOs developed the platform in direct response to repeated requests from market participants for coordinated publication of data that until now could be not easily available. By standardising how results are shared, the platform reduces informational barriers, makes cross-market analysis more reliable, and helps European electricity markets operate with greater openness and clarity.

Platform Scope and Future Expansion

Accessible via www.nemotransparencyplatform.eu, the platform currently focuses on publishing key outputs from day-ahead and intraday markets in a common format. The initiative is not static. The press release makes it clear that the founding NEMOs intend to expand participation and capabilities over time, welcoming additional operators to join and continuously refining the value offered to stakeholders.

Supporting EU Market Integration Goals

This move aligns with broader EU electricity market integration goals and seeks to support policy objectives around efficient price signals, market liquidity, and competitive cross-border trading. While the initial scope covers six bidding zones, the platform has the potential to become a cornerstone of transparency for Europe’s increasingly interconnected electricity markets, supporting better decision-making for all participants, from national regulators to energy traders and analysts.