Information regarding cookies and WWW.SEM-O.COM

By using this website, you consent to the use of cookies in accordance with the Single Electricity Market Operator’s Cookie Policy.
For more information on cookies and our Cookie Policy please follow this link.

I accept

 I-SEM Project 


The wholesale market on the island is due to change considerably to take account of the requirements of the European Network Codes and the Target Model, including a change to four market timeframes. Key elements of the new I-SEM (Integrated – Single Electricity Market) market design include:

  • Active participation by supplier companies – submitting bids to purchase energy in the day-ahead and intraday markets.
  • Suppliers and generators paying / being paid based on prices and quantities determined through ex-ante (forward, day-ahead and intraday) trading.
  • Cross-zonal power flows determined based on energy market trades and power flowing from the cheaper to the more expensive bidding zone.

    General Information

If you are new to the I-SEM Project and need to find out information, you will find background resources in the links:


SEMO is a joint venture between EirGrid PLC and SONI Limited