| HELIOCLIM | Cannes, France | Visit site |
| HELION Hydrogen Power | Aix-en-Provence, France | Visit site |
| HELIOS RES SA | Greece | Visit site |
| HELIOS RES SA | Kifissia, Greece | Visit site |
| HELIUP | Le Bourget-du-Lac, France | · |
| HERMOS | Mistelgau, Germany | Visit site |
| HERO TAQA SARL | Temara, Morocco | · |
| HERO.aero | Salzburg, Austria | Visit site |
| HERZ Energietechnik GmbH | Pinkafeld, Austria | · |
| HESATEKNİK | Bornova, Türkiye | Visit site |
| HESStec (Hybrid Energy Storage Solutions Ltd) | Paterna, Spain | Visit site |
| HEVATECH | Saint-Paul-Trois-Châteaux, France | Visit site |
| HEXA Renewables | Taiwan | Visit site |
| HFIE Power | Hefei Shi, China | Visit site |
| HFM Solar | New Delhi, India | Visit site |
| HG Energiesystemen | Diepenheim, Netherlands | Visit site |
| HH2E | Hamburg, Germany | · |
| HIF Global | El Trébol, Argentina | Visit site |
| HIJAU | Jakarta, Indonesia | Visit site |
| HIS Renewables Polska | Pabianice, Poland | Visit site |
| HISA INGENIERIE | Saint-Romain-de-Colbosc, France | Visit site |
| HITE Smart Energy Co.Ltd. | Jiaxing Shi, China | Visit site |
| HITECH SOLAR | Ahmedabad, India | Visit site |
| HMV Engenharia e Consultoria Ltda | Porto Alegre, Brazil | Visit site |
| HNH Energy | Punta Arenas, Chile | Visit site |
| HOCHTIEF | Essen, Germany | Visit site |
| HOOPP (Healthcare of Ontario Pension Plan) | Toronto, Canada | Visit site |
| HOOPP (Healthcare of Ontario Pension Plan) | London, United Kingdom | Visit site |
| HORIBA MIRA | Rugby, United Kingdom | Visit site |
| HORIBA MIRA | Nuneaton, United Kingdom | Visit site |
| HORIBA MIRA | Basildon, United Kingdom | Visit site |
| HORIEN Salt Battery Solutions | Montecchio Maggiore, Italy | Visit site |
| HOYETEK 合研科技 | 臺北市, Taiwan | Visit site |
| HPC Utility Scale Foundations | · | Visit site |
| HQ Mount Tech | Nördlingen, Germany | Visit site |
| HR Energy | Kaunas, Lithuania | Visit site |
| HRD Corp - Human Resource Development Corporation | Kuala Lumpur, Malaysia | Visit site |
| HS Orka | Grindavík, Iceland | Visit site |
| HSA Energy | Yunusemre, Türkiye | Visit site |
| HSA Enerji | Yunusemre, Türkiye | · |
| HSEA- Hybrid Solar Energy Australia | Sydney, Australia | Visit site |
| HSH-Installateur | Bloemfontein, South Africa | Visit site |
| HTEC | Vancouver, Canada | Visit site |
| HUAXIAVENT - Huaxia New Energy Limited | Zhongshan Shi, China | Visit site |
| HUAXIAVENT - Huaxia New Energy Limited | China | Visit site |
| HUAXIAVENT - Huaxia New Energy Limited | Zhongshan City, China | Visit site |
| HUNAN FENGRI POWER & ELECTRIC CO., LTD | China | Visit site |
| HUNAN FENGRI POWER & ELECTRIC CO., LTD | Shenzhen Shi, China | Visit site |
| HUNAN FENGRI POWER & ELECTRIC CO., LTD | 深圳市, China | Visit site |
| HUYU | Wenzhou Shi, China | Visit site |
| HVSM Ltd. | Kilbrew, Ireland | Visit site |
| HVTI PRIVATE LIMITED | Gurugram, India | Visit site |
| HY SOLAR | Wuxi Shi, China | Visit site |
| HYCCO | Toulouse, France | Visit site |
| HYDGEN | Singapore, Singapore | · |
| HYDRO Exploitation SA | Sion, Switzerland | Visit site |
| HYDRONNOV | Caluire-et-Cuire, France | Visit site |
| HYDS - Hydrogen Solutions | Stord, Norway | Visit site |
| HYGENCO - The Hydrogen Company | Gurugram, India | Visit site |
| HYGN Energy | Newmarket, Canada | Visit site |
| HYPSET | Rendsburg, Germany | Visit site |
| HYSETCO | France | Visit site |
| HYSETCO | Saint-Denis, France | Visit site |
| Habit'Avenir SA | Ecublens, Switzerland | Visit site |
| Habitat Energy | Oxford, United Kingdom | · |
| Habitec Eco Energy | Mexico | Visit site |
| Habitec Eco Energy | Mérida, Mexico | Visit site |
| Hadean Energy | Melbourne, Australia | · |
| Haffner Energy | Vitry-le-François, France | Visit site |
| Hafslund | Oslo, Norway | Visit site |
| Haian Huijue Network Communication Equipment Co., Ltd | Nantong, China | Visit site |
| Haicen Power | Zaozhuang Shi, China | · |
| Haier Energy | Qingdao Shi, China | Visit site |
| Hailei Energy Italia | San Giuliano Milanese, Italy | Visit site |
| Hailei New Energy | Shenzhen Shi, China | Visit site |
| Hailo Wind Systems GmbH & Co. KG | Haiger, Germany | · |
| Haitai Solar | Tangshan Shi, China | Visit site |
| HalioGen Power | Manchester, United Kingdom | · |
| HalloStroom | Gouda, Netherlands | Visit site |
| Hamko | Dhaka, Bangladesh | · |
| Hanchu ESS | Wuxi Shi, China | Visit site |
| Hanergy | Beijing, China | Visit site |
| Hangzhou Lanran Technology | Hangzhou Shi, China | Visit site |
| Hans Sommer GmbH | Wasen im Emmental, Switzerland | Visit site |
| Hanse Windkraft GmbH | Hamburg, Germany | Visit site |
| Hansen Yuncken | Melbourne, Australia | Visit site |
| Hao Solar | Singapore, Singapore | Visit site |
| HaoSolar | Singapore, Singapore | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Dongying, People's Republic of China | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Dongying City, China | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Germany | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Turkey | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Egypt | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Myanmar | Visit site |
| Harbin Coslight New Energy Co., Ltd. | India | Visit site |
| Harbin Coslight New Energy Co., Ltd. | South Korea | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Vietnam | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Malaysia | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Indonesia | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Netherlands | Visit site |
| Harbin Coslight New Energy Co., Ltd. | USA | Visit site |
| Harbin Coslight New Energy Co., Ltd. | United Arab Emirates | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Kenya | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Changsha, China | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Changde, China | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Harbin, China | Visit site |
| Harbin Coslight New Energy Co., Ltd. | Shenzhen, China | Visit site |
| Hardkorr | Gold Coast, Australia | Visit site |
| Hargassner Biomass Heating Ltd | Hereford, United Kingdom | Visit site |
| Hargassner North America | Toronto, Canada | Visit site |
| Hargassner North America | Weng im Innkreis, Austria | Visit site |
| Harmony Energy | Knaresborough, United Kingdom | · |
| Harmony Solar | Dun Laoghaire, Ireland | Visit site |
| HarmonyFab | Biswanath, India | Visit site |
| Harvest Green Developments Ltd | Barnstaple, United Kingdom | Visit site |
| Hassan Allam Holding | Cairo, Egypt | Visit site |
| Haustechnik Hardegen GmbH | Hanau, Germany | Visit site |
| Havenhill Synergy Limited | Abuja Municipal, Nigeria | Visit site |
| Havenwise | London, United Kingdom | Visit site |
| Havila Biogass | Fosnavåg, Norway | Visit site |
| Heat Pump Federation | Marlborough, United Kingdom | Visit site |
| Heat Pump Installers UK | Huddersfield, United Kingdom | Visit site |
| Heat Pump Tech | Leeds, United Kingdom | Visit site |
| Heat Pumps Ireland | Dundalk, Ireland | Visit site |
| HeatH Technologies | Malmö, Sweden | Visit site |
| Heatload | Chichester, United Kingdom | Visit site |
| Heatrix | Bremen, Germany | Visit site |
| Heaven Designs Pvt Ltd | Surat, India | Visit site |
| Heaven Green Energy Ltd. | Mangrol, India | Visit site |
| Heaven Institute of Renewable Energy (H.I.R.E.) | Mangrol, India | · |
| Heckert Solar | Chemnitz, Germany | Visit site |
| Hefaistos Global SA | Trikala, Greece | Visit site |
| HegaTech | Wuxi Shi, China | Visit site |
| Hegel System Technische Sdn Bhd - MEP & Facility Maintenance Specialist | Subang Jaya, Malaysia | Visit site |
| Hegel System Technische Sdn Bhd - MEP & Facility Maintenance Specialist | Kuching, Malaysia | Visit site |
| Hegel System Technische Sdn Bhd - MEP & Facility Maintenance Specialist | Hamburg, Germany | Visit site |
| Hegg Energy | Amsterdam, Netherlands | Visit site |
| Heim AG Heizsysteme | Aadorf, Switzerland | · |
| Heinemann Solutions GmbH | Elsfleth, Germany | Visit site |
| Heinzel Energy | Vienna, Austria | Visit site |
| Heiru | Telč, Czech Republic | Visit site |
| Heitzmann AG | Schachen, Switzerland | · |
| Helexia Portugal | Lisboa, Portugal | · |
| Heliartec Solutions Corporation, Ltd. (Taiwan) | 竹北市, Taiwan | Visit site |
| Heliatek | Dresden, Germany | Visit site |
| Helical Fusion | 東京都, Japan | Visit site |
| Helio Connect GmbH | Hamburg, Germany | Visit site |
| Heliomex | León, Mexico | Visit site |
| Helion Energy AG | Zuchwil, Switzerland | Visit site |
| Helios Energy | Pitești, Romania | · |