| Grøvan Kraft AS | Lillesand | 2016 |
| Gudbrandsdal Energi AS | Vinstra | 2015 |
| Gudbrandsdal Energi Holding AS | Vinstra | 2015 |
| Gudbrandsdal Energi Produksjon AS | Vinstra | 1986 |
| Guleslettene Vindkraft AS | Svelgen | 2008 |
| Gullbergelva Kraftverk AS | Oslo | 2018 |
| Gursli Minikraftverk AS | Moi | 2007 |
| Gyl Kraft AS | Oslo | 2006 |
| Gårdskraft AS | Bergen | 2022 |
| Gårdskraft II AS | Oslo | 2025 |
| Gåslunelva Kraftverk AS | Bjugn | 2000 |
| H2CARRIER AS | Fornebu | 2020 |
| H2O Summit AS | Voss | 2024 |
| Haakonsvern Energi AS | Oslo | 2020 |
| Hadeland Energi AS | Jaren | 2003 |
| Hadeland Kraft AS | Jaren | 1998 |
| Hadeland Og Ringerike Bioraffineri AS | Jevnaker | 2025 |
| Hafenstrom AS | Narvik | 2013 |
| Hafslund AS | Oslo | 2018 |
| Hafslund Celsio AS | Oslo | 1997 |
| Hafslund Kraft AS | Oslo | 1996 |
| Hafslund Kraft Innlandet AS | Lillehammer | 2004 |
| Hafslund Produksjon AS | Askim | 2004 |
| Hafslund Produksjon Holding AS | Oslo | 1898 |
| Hafslund Sarpfoss Holding AS | Oslo | 2025 |
| Hafslund Vind AS | Oslo | 2026 |
| Haglund Bioenergi AS | Rena | 2025 |
| Halden Kraftproduksjon AS | Lillestrøm | 2004 |
| Halsa Energi AS | Halsa | 2024 |
| Halvdagsåa Kraft AS | Selbu | 2012 |
| Hammerfest Energi AS | Hammerfest | 2020 |
| Hammerfest Energi Kraftomsetning AS | Hammerfest | 2010 |
| Hammerfest Energi Produksjon AS | Hammerfest | 2004 |
| Hammerfest Energi Varme AS | Hammerfest | 2008 |
| Hammerfest Iwind AS | Hammerfest | 2023 |
| Hamnefjell Vindkraft AS | Alta | 2012 |
| Hamnefjell Vindkraft Holding AS | Alta | 2015 |
| Hanevold Solpark AS | Svarstad | 2024 |
| Hanfoss Kraftverk SA | Sauland | 2006 |
| Hantveitelva Kraft AS | Dalsøyra | 2024 |
| Harakiri Sushi AS | Bergen | 2026 |
| Harald Hårfagre AS | Haugesund | 2021 |
| Haram Kraft AS | Grålum | 2003 |
| Hardanger Biogass AS | Husnes | 2019 |
| Hardanger Energi AS | Kinsarvik | 2001 |
| Hardanger Kraft AS | Stord | 2005 |
| Hardanger Økonomiservice AS | Eidfjord | 2003 |
| Haringnett AS | Norheimsund | 2019 |
| Hartevasstjønn Kraft AS | Oslo | 2025 |
| Hartree Partners (Norway) AS | Oslo | 2023 |
| Hattfjelldal Kraft AS | Hattfjelldal | 2007 |
| Haugaland Biogass AS | Kopervik | 2024 |
| Haugaland Kraft AS | Haugesund | 2015 |
| Haugaland Kraft Energi AS | Haugesund | 2015 |
| Haugane Kraft AS | Førde | 2006 |
| Hauge Minikraftverk AS | Dalsøyra | 2008 |
| Haughom Og Øksendal E-Verk AS | Tonstad | 2006 |
| Haugsvær Kraft AS | Valen | 2022 |
| Hauknes Mikrokraft Da | Utskarpen | 2010 |
| Havila Biogass Haugalandet AS | Fosnavåg | 2024 |
| Havila Biogass Hustadvika AS | Fosnavåg | 2024 |
| Havila Biogass Innlandet AS | Fosnavåg | 2024 |
| Havila Biogass Jæren AS | Fosnavåg | 2024 |
| Havila Biogass Nesset AS | Eidsvåg I Romsdal | 2019 |
| Havila Biogass Ryfylke AS | Fosnavåg | 2025 |
| Havila Biogass Trøndelag AS | Fosnavåg | 2024 |
| Havkraft Solutions AS | Stavanger | 2015 |
| Havnekraft AS | Haugesund | 2020 |
| Havnett AS | Vestre Vinnesvåg | 2019 |
| Haze Vind Da | Hamar | 2024 |
| Hedmark Biogass AS | Åsnes Finnskog | 2017 |
| Heggemselva Mikrokraftverk AS | Bøfjorden | 2018 |
| Heidal Miljøenergi AS | Heidal | 2008 |
| Heidelva Kraftverk AS | Austefjorden | 1997 |
| Heikraft AS | Oslo | 2005 |
| Heilhornkraft AS | Terråk | 2022 |
| Heim Energi AS | Kyrksæterøra | 2021 |
| Heina Kraft AS | Meisingset | 2006 |
| Helganes Kraft AS | Suldalsosen | 2021 |
| Helgeland Kraft AS | Mosjøen | 2016 |
| Helgeland Kraft Strøm AS | Mosjøen | 2016 |
| Helgeland Kraft Vannkraft AS | Mosjøen | 2016 |
| Helgøy Energi AS | Fiskå | 1997 |
| Helle Kraftverk AS | Konsmo | 2025 |
| Helle Kraftverk Da | Konsmo | 2005 |
| Hellefoss Kraft AS | Hokksund | 1898 |
| Hellifossen Kraft AS | Bergen | 2018 |
| Heltneelva Kraft AS | Volda | 2019 |
| Hemma Da | Brøttum | 1999 |
| Hemsedal Bioenergi AS | Hemsedal | 2008 |
| Heptehei Sol- Og Batteripark AS | Kristiansand S | 2025 |
| Herad Kraft Da | Gol | 2006 |
| Herand Kraft AS | Herand | 2007 |
| Herefoss Kraft AS | Herefoss | 2019 |
| Herjåa Kraft AS | Singsås | 2010 |
| Herre Kraftstasjon AS | Stathelle | 2008 |
| Herøya Nett AS | Porsgrunn | 2012 |
| Heskestad Kraft AS | Ualand | 2006 |
| Hestdal E-Verk AS | Vanvikan | 2001 |
| Hestekrefter Energi AS | Porsgrunn | 2021 |