| Appointee | Alternative | Participant | Capacity |
| Karl Leavy | Michael Noone | ESB CS | Supplier |
| Eugene Maguire | William Steele | NIE Energy (Supply) | Supplier |
| Iain Wright | Emeka Chukwureh | Airtricity | Supplier |
| Tanya Gill | Rhiannon Jones | Bord Gais Energy Supply | Supplier |
| Roy Foreman | Ian Luney | NIE PPB | Generator |
| Stephen Walsh | Eugene McAuley | ESB PG | Generator |
| Margaret Hayden | Dave O'Connor | ESBI | Generator |
| Garrett Blaney | John Newman | Viridian Power and Energy | Generator |
| David Naughton | Philip Newsome | CER | RAs |
| Juliet Corbett | Kevin O'Neill | NIAUR | RAs |
| Denis Kelly | Gerard Magee | NIE T&D | MDP |
| Frank Leetch | John Dunphy | ESB Networks | MDP |
| Gill Nolan | Niamh Delaney | Market Operator | MO |
| Michael Preston | Alex Baird | SONI | SO's |
| Rodney Doyle | Liam Ryan | Eirgrid | SO's |
SEMO is a joint venture between EirGrid plc and SONI Limited
