| Bulko Kraft AS | Granvin | 2006 |
| Buset Kraft AS | Oslo | 2023 |
| Byakraft AS | Ekne | 2002 |
| Byfjordparken Energi AS | Stavanger | 2014 |
| Bygland Varmesentral AS | Bygland | 2004 |
| Byrkjedal Kraftverk AS | Dirdal | 1998 |
| Bærum Energiomsetning AS | Vear | 2016 |
| Bøen Kraft AS | Oslo | 2005 |
| Bølakraft AS | Oslo | 2019 |
| Bømlo Kraftnett AS | Bremnes | 2019 |
| Børsdalselva Kraftverk AS | Stord | 2007 |
| Børter E Verk AS | Enebakk | 2023 |
| Cacharge AS | Oslo | 2019 |
| Cadre Elvekraft 2 AS | Kristiansand S | 2023 |
| Cadre Elvekraft AS | Kristiansand S | 2022 |
| Cadre Group AS | Kristiansand S | 2022 |
| Cadre Invest AS | Kristiansand S | 2021 |
| Carbonworks Norway AS | Tolvsrød | 2021 |
| Centrica Energy Trading Nuf | 9000 Aalborg | 2015 |
| Centrica PLC | Stavanger | 2012 |
| CHARGE365 AS | Bergen | 2014 |
| CHARGE4GO AB | Se-114 56 Stockholm | 2022 |
| Chargepoint Network (Netherlands) B.V. | 1101Be Amsterdam | 2020 |
| Cheap Energy Norge AS | Vear | 2015 |
| Chili Connections AS | Bekkestua | 2025 |
| CHR Salvesen & CHR Thams's Communications Aktieselskab | Bergen | 1898 |
| CJT Kraft AS | Kvinesdal | 2026 |
| CK Bond AS | Oslo | 2018 |
| Clara Lux Limited | Great Yarmouth Nr29 3Hj England | 2018 |
| Clemens Kraft AS | Oslo | 2013 |
| Clemens Kraft Holding AS | Oslo | 2006 |
| Clemens Kraftverk AS | Oslo | 2002 |
| Cloudberry Clean Energy ASA | Oslo | 2017 |
| Cloudberry Production AS | Oslo | 2017 |
| CM District Energy Norway AS | Oslo | 2019 |
| CM District Energy Norway Holding AS | Oslo | 2020 |
| Copenhagen Energy Trading Nuf | Dk-1799 København V | 2024 |
| Corpower Ocean Norge | Risør | 2015 |
| Cutting Solutions AS | Haus | 2024 |
| Dagdylju Energi AS | Dalholen | 2004 |
| Dagsvikelva Kraft AS | Oslo | 2012 |
| Dalane Biogass AS | Bjerkreim | 2023 |
| Dalane Energi AS | Egersund | 2016 |
| Dalane Energisalg AS | Egersund | 2018 |
| Dalane Kjernekraft AS | Egersund | 2025 |
| Dalane Kraft AS | Egersund | 2000 |
| Dalane Vind AS | Egersund | 2011 |
| Dale Kraft AS | Balestrand | 2017 |
| Dalelvo Kraft AS | Mauranger | 2008 |
| Danske Commodities | Dk-8000 Aarhus C | 2019 |
| DB Kraftverk AS | Dale I Sunnfjord | 2021 |
| De Nett AS | Drangedal | 2020 |
| Deep Energy AS | Trondheim | 2025 |
| Dekar Energi AS | Vikersund | 2026 |
| Den Magiske Fabrikken AS | Sem | 2020 |
| Denofa Energi AS | Gamle Fredrikstad | 2014 |
| Det Norske Kraftselskap AS | Bergen | 2017 |
| Diakonhjemmet Energisentral AS | Oslo | 2019 |
| Differ Community Power AS | Oslo | 2020 |
| Differ Energy Rød Solkraftverk AS | Oslo | 2024 |
| Different Development AS | Oslo | 2016 |
| Digital Charging Solutions GmbH | De-10119 Berlin | 2020 |
| Digital Energy AS | Skoppum | 2022 |
| Dingelsundet Energy AS | Oslo | 2014 |
| Dirdal Kraft AS | Dirdal | 1996 |
| Dokka Biovarme AS | Dokka | 2005 |
| Dokka Fjernvarme AS | Dokka | 2008 |
| Dovre Biovarme Da | Dombås | 2008 |
| Dragefossen AS | Rognan | 1928 |
| Drammen Fjernvarme AS | Drammen | 1998 |
| Drangedal Kraft AS | Drangedal | 2020 |
| Drangedal Kraft Holding AS | Drangedal | 2020 |
| Drangeid Energi AS | Øyestranda | 2005 |
| Dravlaus Kraft AS | Bergen | 2015 |
| Drengsrudbekken Energi AS | Asker | 1994 |
| Driva Kraftverk Da | Trondheim | 1966 |
| Dråpe Energi AS | Oslo | 2021 |
| Dvergfossen Kraft AS | Oslo | 2018 |
| Dvergsdalsdalen Kraftverk AS | Skei I Jølster | 2009 |
| DWK 01 AS | Nesbyen | 2025 |
| Dynegy Global Liquids Inc | Stavanger | 2002 |
| Dyrdal Kraft AS | Bjordal | 2012 |
| Dyrstad Kraft AS | Bergen | 2021 |
| Dønnesfjord Vindpark AS | Oslo | 2011 |
| Døvik Kraft AS | Oslo | 2003 |
| E-Thor Energy Solution AS | Kirkenes | 2022 |
| Eagle Wind AB | Se-111 43 Stockholm | 2024 |
| Eam Solar AS | Oslo | 2011 |
| Eastern Norge Svartisen AS | Bodø | 1998 |
| Ecogas AS | Verdal | 2016 |
| Ecopro AS | Verdal | 2002 |
| Edf Trading Limited Nuf | London Sw1E 5Jl | 2007 |
| Edleco AS | Moss | 2007 |
| Efteland Kraftverk AS | Helleland | 2021 |
| Egersund Vind AS | Stavanger | 2009 |
| Eidefoss Fornybar AS | Vågå | 2023 |
| Eidefoss Strøm AS | Vågå | 2019 |
| Eidefoss Vannkraft AS | Vågå | 2019 |
| Eidestøa AS | Eikelandsosen | 2022 |
| Eidsdal Kraftverk AS | Kristiansand S | 2021 |