| OEOrkuvirki ehf Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Construction work Rafmagnskerfi Rafmagnsverkfræði Framleiðsla | |
| PPolk Garðabær, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Industrial machinery Sjálfbær Raforkuframleiðsl Jarðvarmi Vatnsafl | |
| O-ON - Orka náttúrunnar / ON Power Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Industrial machinery Rafmagnframleiðsla Jarðhiti Heitavatn | |
| LLandsvirkjun Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Industrial machinery Construction work | |
| IIceWind Reykjavik, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Industrial machinery Lóðréttar Öxum Vindmyllur Endurnýjanleg Orka Öfgaveður | |
| GEGEG ehf. Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Industrial machinery | |
| VAVerkfræðistofan Afl og Orka Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Industrial machinery | |
| GGridtech Reykjavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Installation services (except software) Stafrænar Spennistöðvar Snjallnet IEC 61850 | |
| HOHS Orka Grindavík, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Installation services (except software) | |
| GEGreen Energy Group AS Reykjavik, IcelandEnergy, Utilities & Waste Treatment | Electrical machinery, apparatus, equipment and consumables; lighting Construction work Geothermal Engineering Geothermal Power Plants Thermoelectric Generation | |