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SEMO Helpdesk

Republic of Ireland: 1800 726 772
Northern Ireland: 0800 072 6772
International: +353 1 237 0584

The SEMO Helpdesk is available Mon-Fri from 9.00am until 5.00pm. We operate a voicemail service if we are unavailable.

SEMO LCF Hotline

Phone Number: +353 1 237 0744

This should only be used for emergency operational issues relating to to Limited Communication Failures (LCF). The process for declaring and submitting a LCF can be found on the SEMO website.

The Hotline is available 24/7 on an interim basis.

Our Locations

Republic of Ireland

SEMO Customer Service
160 Shelbourne Road
Ballsbridge
Dublin 4
D04 FW28

Fax: +353 1 237 0035

Northern Ireland

SEMO Customer Service
Castlereagh House
12 Manse Road
Belfast BT6 9RT

Fax: +44 2890 707555

Complaints Procedure

If you are unhappy with the quality of service you have received, you have the right to complain. Please direct these complaints to markethelpdesk@sem-o.com for the attention of the Market Operations Manager. An escalation process will be initiated and your complaint will be addressed.

As per the Trading & Settlement Code participants may raise a dispute in respect of a Data or Settlement query – please see Agreed Procedure 14 – Disputes.

For further information, view SEMO's full Customer Charter.