Members of the project group Master Data Structuring
| Company | Country | Task |
| Atrias | BE | |
| RWE | DE | |
| Fingrid | FI | |
| EDSN | NL | MDS Convenor |
| TenneT | NL | |
| EdiSys | NO | MDS Secretary |
| Hafslund | NO | |
| Tauron Dstrybucja | PL | |
| Energa-Operator SA | PL | |
| Svenska kraftnät | SE | |
| Section IPET | SI | |
| AMT-Sybex | IE | Observer |