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H
- H2 Energy Europe
- H2 Green Steel
- H2Carrier
- H2U
- Hafslund Oslo Celsio (Celsio)
- Hai Linh Company Limited
- Hainsford Energy
- Haisla Nation
- Hallam Land Management
- Halmahera Sukses Mineral
- Hamlyns Oats
- Hammers Hill Energy
- Hanas Energy
- Hansa Hydrocarbons
- Hansainvest Real Assets
- Hanseatic Energy Hub
- Hanwha Corporation E&C Division
- Harbour Energy
- Hargreaves Services
- Harmony Energy Income Trust
- Harmony OB
- Hassan Allam Utilities
- Hazelwood Power
- HDR
- Heavy haulage and trailers
- Helen
- Helix Robotics Solutions
- Hepburn Community Wind Park Co-operative
- HEQ Deepwater
- Herlogas
- Hess
- Hess Corporation
- Hessay Solar Limited
- HEXA Renewables
- Hexicon
- HH2E
- Hibiki Wind Energy
- Hibiscus Petroleum
- Hidroelectrica
- Highland Wind
- Highview Power
- Hilcorp
- Hitcachi Energy
- Hive Energy
- HOFOR
- Holcim
- Holtec International
- Hong Kong
- Horisont Energi
- Horizon Nuclear Power
- Horizon Power
- HØST PtX Esbjerg
- Hrvatska elektroprivreda (HEP Group)
- HS Orka
- Huadian Jiangsu Energy
- Huajin Aramco Petrochemical Company (HAPCO)
- Huawei Digital Power
- HUBCO
- Hungary
- Hunt Transmission Services
- Hy2gen
- Hydro
- Hydro Rein
- Hydro Tasmania
- Hydrogen
- HydrogenOne
- Hydroplan
- Hydro-Québec
- HydroWing Tidal Projects
- Hygen
- Hynamics
- HyNet North West
- Hyro