7 October 2025, SIDC Press Release
The Single Intraday Coupling (SIDC) parties are pleased to announce the successful extension of the 15-minute Market Time Unit (MTU) to the Greek bidding zone and its bidding zone border, effective as of 30 September 2025.
This marks the completion of the pan-European rollout of the 15-minute MTU in intraday continuous trading and intraday auctions. On 18 March 2025 most European bidding zones and borders successfully transitioned to 15-minute intervals. The Greek area has now been introduced to fulfil the national requirement for the simultaneous introduction of the 15-minute MTU in both the SDAC and SIDC.
The rollout has been achieved thanks to years of collaboration, planning and technical innovation, supported by a carefully coordinated wave-based go-live approach that ensured a smooth transition across Europe.
About SIDC
The Single Intraday Coupling (SIDC) is a market mechanism in the intraday timeframe defined in the CACM Regulation based on continuous trading and complemented by three intraday auctions (so called “IDAs”).
The SIDC continuous trading solution is based on a common IT system with one Shared Order Book, a Capacity Management Module and a Shipping Module. It allows for orders entered by market participants for continuous matching in one bidding zone to be matched by orders similarly submitted by market participants in any other bidding zone within the European Intraday Coupling as long as transmission capacity is available. The intraday solution supports both explicit allocation (where approved by the respective National Regulatory Authorities) and implicit continuous trading. It is in line with the EU Target model for an integrated intraday market.
In addition, SIDC IDAs allow for the pricing of cross-border capacity in the intraday timeframe. IDAs are implicit auctions where collected orders are matched, and cross-zonal capacity is allocated simultaneously for different bidding zones, determining clearing prices for each bidding zone.
European-wide intraday coupling is a key component for completing the European Internal Energy Market. With the rising share of intermittent generation in the European generation mix, connecting intraday markets through cross-border trading is an increasingly important tool for market parties to keep positions balanced. The purpose of the SIDC is to increase the overall efficiency of intraday trading.
For additional information on SDAC go to:
http://www.nemo-committee.eu/sidc
https://www.nemo-committee.eu/ida
https://www.entsoe.eu/network_codes/cacm/implementation/sidc/
https://www.entsoe.eu/network_codes/cacm/implementation/ida/
The pdf version of the press release is available here.