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| Energibygg Nord AS | Alta | 2024 |
| Energicus AS | Haugesund | 2024 |
| Energidata AS | Saupstad | 2003 |
| Energidata Consulting AS | Fjellhamar | 2007 |
| Energiengagemang Sverige AB Avd. Norge Nuf | 645 47 Strängnäs | 2023 |
| Energiengasjement Norge AS | Fornebu | 2023 |
| Energies AS | Kristiansand S | 2005 |
| Energifangst Og Lagring AS | Trondheim | 2023 |
| Energiflex AS | Asker | 2001 |
| Energifysikk AS | Gamle Fredrikstad | 2026 |
| Energigården AS | Brandbu | 2006 |
| Energigården Vekst AS | Brandbu | 2020 |
| Energihjelpen AS | Oslo | 2024 |
| Energihuset Holding AS | Mandal | 2019 |
| Energihuset Marked AS | Drammen | 2021 |
| Energihuset Vestland AS | Bergen | 2023 |
| Energiinnovasjon AS | Ås | 2010 |
| Energikanalen AS | Hønefoss | 2011 |
| Energikapital AS | Oslo | 2009 |
| Energikompetanse AS | Indre Arna | 1999 |
| Energima Analyse AS | Lysaker | 2005 |
| Energimatic AS | Årland | 1992 |
| Energimester AS | Kjørsvikbugen | 2024 |
| Energineering AS | Haugesund | 2024 |
| Energioptimal Vest AS | Skogsvåg | 2021 |
| Energioptimalisering Norge AS | Oslo | 2022 |
| Energipakka AS | Drammen | 2023 |
| Energiproffen AS | Berger | 2024 |
| Energirampen AS | Oslo | 2024 |
| Energirespons Nuf | Se-53170 Lidköping | 2024 |
| Energiri AS | Sandnes | 2016 |
| Energiråd AS | Ålesund | 2009 |
| Energirådgivning Norge AS | Oslo | 2025 |
| Energismart Bolig AS | Straume | 2024 |
| Energismart Norge AS | Rolvsøy | 2010 |
| Energisystem AS | Eikelandsosen | 2025 |
| Energitiltaket AS | Kristiansand S | 2019 |
| Energiutvikling AS | Ranheim | 1997 |
| Energize AS | Åros | 2021 |
| Energize Nordic AS | Oslo | 2019 |
| Energiøkonomisering AS | Tynset | 2015 |
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| Energon AS | Kolsås | 1998 |
| Energon Holding AS | Kolsås | 2005 |
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| Energy Advisory AS | Asker | 2025 |
| Energy Advisory Services AS | Kolsås | 2004 |
| Energy and Oilfield Solutions Aps Nuf | Dk-6700 Esbjerg | 2024 |
| Energy AS | Stavanger | 2020 |
| Energy Cluster Norway AS | Oslo | 2024 |
| Energy Communication Systems AS | Asker | 1986 |
| Energy Consult AS | Klepp Stasjon | 2020 |
| Energy Consult Group AS | Klepp Stasjon | 2022 |
| Energy Consult Offshore Wind AS | Klepp Stasjon | 2022 |
| Energy Consulting AS | Oslo | 1996 |
| Energy Creative Group AS | Trondheim | 2002 |
| Energy Development AS | Kolbotn | 1975 |
| Energy Dynamics AS | Sandnes | 2011 |
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| Energy Harvest AS | Trondheim | 2015 |
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| Energy Invented AS | Fornebu | 2022 |
| Energy People AS | Loddefjord | 2023 |
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| Energy Research Norway AS | Fyllingsdalen | 2017 |
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| Energy Systems AS | Høvik | 2021 |
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| Energy Tellus AS | Evje | 2010 |
| Energy Traders Consulting Limited | Oslo | 2021 |
| Energy Trading AS | Sandnes | 2020 |
| Energy Transition Advisory AS | Åsgårdstrand | 2026 |
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| Energy Wise AS | Stavern | 1998 |
| Energy&Management AS | Jar | 2001 |
| Energyautomation AS | Borgenhaugen | 2018 |
| Energybuoy AS | Oslo | 2012 |
| Energychange AS | Stavanger | 2024 |
| Energycode AS | Lillesand | 2023 |
| Energyexe AS | Billingstad | 2025 |
| Energyfield Nuf | Vettre | 2008 |
| Energyfirst Holding AS | Stavanger | 2015 |
| Energyinfo AS | Harestua | 2006 |
| Energylab AS | Oslo | 2025 |
| Energynest AS | Billingstad | 2011 |
| Energyoptimal AS | Oslo | 2009 |
| Energytech Consult | 9500 Hobro | 2011 |
| Enerhaugen Holding AS | Oslo | 2005 |
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| Enerin AS | Florø | 2013 |
| Enerion AS | Klepp Stasjon | 2017 |
| Enerklima AS | Rud | 2009 |
| Enerlytiks AS | Asker | 2024 |
| Enern Invest AS | Haslum | 2017 |