Lista Membrilor Colectivi ai SIER
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| SC ELECTRICA | |
| SDEE Oradea | |
| Grup ENERGOBIT Cluj | |
| EXIMPROD GRUP Buzău | |
| SMART Bucureşti | |
| CNTEE TRANSELECTRICA (reînscriere) | |
| OPCOM | |
| HIDROELECTRICA | |
| DELGAZ - GRID (E.ON Moldova) | |
| INCDIE - ICMET Craiova | |
| ROENG - Transmission Engineering and Consulting | |