Contact Us

The SEMO Helpdesk provide an information service for all interested parties, from the industry and market participants to the general public, providing information regarding all aspects of SEMO Operations.

Email

General queries related to SEMO please email markethelpdesk@sem-o.com

Queries related to Market Registration please email registration@sem-o.com

Market Participants should submit data and settlement queries to datasettlementquery@sem-o.com

Phone

The SEMO Helpdesk are available Mon-Fri from 9am until 4.30pm. We operate a voicemail service if we are unavailable. You can contact us by phone using the numbers below:

ROI: 1800 778 111

NI: 08000 778 111

International: +353 1 237 0468

For emergency operational issues relating to bids submission through type 1,2 or 3 please ring the helpline on +353 1 2370573, all other queries should go through the helpdesk.

Fax

If you are required to fax information to us, our fax numbers are:

ROI: +353 1 237 0035
NI: +44 2890 707555

Post

If you are required to post information to us please use the relevant address below:

SEMO Customer Service
160 Shelbourne Road
Ballsbridge
Dublin 4
Republic of Ireland

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

If you are visiting us please see below links to a interactive Google maps displaying both our locations:

Castlereagh House, Belfast Interactive Map

The Oval, Dublin 4 Interactive Map