Members SO-SW
| Member |
| Sognekraft Produksjon AS |
| SSAB Europe Oy |
| SSE Energy Supply Ltd. |
| Stadtwerke Düsseldorf AG |
| Stadtwerke Flensburg GmbH |
| Statkraft Energi AS |
| Statkraft Markets GmbH |
| Statnett SF |
| Steag Power GmbH |
| Stockholm Energi AB |
| Stora Enso Oyj |
| Storuman Energi AB |
| Summit Energy Europe Ltd |
| Sundsvalls Kommun |
| Sunflow |
| Sunnhordland Kraftlag AS |
| Sunnic Lighthouse GmbH |
| Suomen Voima Oy |
| SVEA Solar Park Energy AB |
| Svenska kraftnät (SVK) |
| S-Voima OY |
| Swedavia Energi AB |
| Swedbank AB |