| Hitachi Zosen Inova | Zürich, Zürich | Visit site |
| HitecVision | Stavanger, Rogaland | Visit site |
| Hitech Digital Solutions | Ahmedabad, Gujarat | Visit site |
| Hitech New Energy | Qingdao Shi, Shandong | · |
| Hock Seng Lee Berhad | Kota Samarahan, Sarawak | Visit site |
| Hodess Cleanrooms, The Full Lifecycle Partner | Attleboro, Massachusetts | Visit site |
| Hoenergy | Janyi, Wakiso | Visit site |
| Hoffman Construction Company | Lake Oswego, Oregon | Visit site |
| Hoku Energy Limited | London, England | Visit site |
| Holden Cable | Zhejiang | Visit site |
| Hollaender | Cincinnati, Ohio | Visit site |
| Holland Land Resources | Fort Worth, Texas | Visit site |
| Hollander Techniek | Apeldoorn, Gelderland | Visit site |
| Hollaway Environmental + Communications Services, Inc. | Houston, Texas | Visit site |
| Holocene Clean Energy | Raleigh, North Carolina | Visit site |
| Holovision | Brisbane, Queensland | Visit site |
| Holtec Asia | Mulshi, Maharashtra | Visit site |
| Holtec Britain | Bristol, England | Visit site |
| Holtec International | Jupiter, Florida | Visit site |
| Holu Solar | São Paulo, São Paulo | Visit site |
| Home Improvement Solar | Orlando, Florida | Visit site |
| Home Pro Roofing and Solar | Sunnyvale, California | Visit site |
| Home Run Financing (formerly PACE Funding Group) | Los Gatos, California | Visit site |
| HomeSourced, Inc. | Naga City, Cebu | Visit site |
| Homeland Electric Inc. | Alberton, Prince Edward Island | Visit site |
| Honeywell Industrial Automation | Houston, Texas | Visit site |
| Hong Light New Energy | Shenzhen Shi, Guangdong | Visit site |
| Hongfa America, Inc. | Lake Forest, California | Visit site |
| Hopergy | Xiamen Shi, Fujian | Visit site |
| Hopium | Saint-Bonnet-de-Mure, Rhône | Visit site |
| Horizon Solar Power | Temecula, California | Visit site |
| Horizons Energy | Dublin, Ohio | Visit site |
| Horizontal Technology, Inc. | Hockley, Texas | Visit site |
| Horizonview Technologies | Watsonville, California | Visit site |
| Hornour Energy | Suzhou Shi, Jiangsu | Visit site |
| Hounen Solar America Inc. | South Carolina | Visit site |
| Hoymiles | Hangzhou Shi, Zhejiang | Visit site |
| Hresys | Hangzhou Shi, Zhejiang | Visit site |
| Huadong Cable | Zhengzhou Shi, Henan | Visit site |
| Huanghua Zhaoyuanli Hardware Products Co.,Ltd | Huanghua City, Hebei Province | Visit site |
| Huangjintai Electronics | Shenzhen Shi, Guangdong | Visit site |
| Huaquan Power | Shandong | Visit site |
| Huaxing cable USA LLC | Irvine, California | Visit site |
| Huayao PV | Changzhou Shi, Jiangsu | Visit site |
| HubWatt | Le Bourget-du-Lac, Savoie | Visit site |
| Hubbard Electrical Contracting, LLC | Jacksonville, Florida | Visit site |
| Hubbell Incorporated | Shelton, Connecticut | Visit site |
| Hubei Jiandun Fire Technology Co., Ltd. | Hubei | Visit site |
| Huber+Suhner | Herisau, Appenzell Ausserrhoden | Visit site |
| Hubert + Freihart | Eichstätt, Bavaria | Visit site |
| Huda Lighting | Dubai, Dubai | Visit site |
| Huizhou Top Me Technology Co., Ltd | 桃園區, Taoyuan | Visit site |
| Hukseflux Brasil | São José dos Campos, São Paulo | Visit site |
| Hukseflux Thermal Sensors | Delft, South Holland | Visit site |
| Hullbot | Sydney, New South Wales | Visit site |
| Hunan Rika Electronic Tech Co., Ltd. | Changsha Shi, Hunan | Visit site |
| Hunan Wincle Energy Storage Technology Co., Ltd. | Changsha Shi, Hunan | Visit site |
| Hunan Yujing Machinery Co., Ltd | 益阳市, 湖南省 | Visit site |
| Hunt Electric | Eagan, Minnesota | Visit site |
| Hunt Electric, Inc. | South Salt Lake, Utah | Visit site |
| Hurricane Hill Development Company PLLC | Mason, New Hampshire | Visit site |
| Hustler Turf Equipment, Inc. | Towson, Maryland | Visit site |
| HutanBio | Cambridge, England | Visit site |
| Hutton | Wichita, Kansas | Visit site |
| Hy Brazil Energia | Belo Horizonte, Minas Gerais | Visit site |
| HyCologne Wasserstoff Region Rheinland e.V. | Hürth, North Rhine-Westphalia | Visit site |
| HyDresden | Dresden, Saxony | Visit site |
| HyKit | Bicester, England | Visit site |
| HyWaves | Bedford, England | Visit site |
| Hycamite | Kokkola, Central Ostrobothnia | Visit site |
| HydePoint | Stavanger, Rogaland | Visit site |
| HydraB | Oxford, England | Visit site |
| Hydro One | Toronto, Ontario | Visit site |
| Hydro Rein | Oslo, Oslo | Visit site |
| Hydro Tasmania | Hobart, Tasmania | Visit site |
| Hydro X | Jerusalem, Jerusalem District | Visit site |
| Hydrobox | Brussels, Brussels-Capital | Visit site |
| Hydrogen Council | Brussels, Brussels-Capital | Visit site |
| Hydrogen Education Foundation | Washington, District of Columbia | Visit site |
| Hydrogen Refueling Solutions - HRS | Moineville, Meurthe-et-Moselle | Visit site |
| Hydrogen UK | London, England | Visit site |
| Hydronex | Steenwijk, Overijssel | Visit site |
| Hydroseeding Solutions, LLC | St. Cloud, Florida | Visit site |
| Hydrostadium | Annecy, Haute-Savoie | Visit site |
| Hydryx | Amsterdam, North Holland | Visit site |
| Hygreen Energy | Madrid, Madrid | Visit site |
| Hymeth | Malmö, Skåne | Visit site |
| Hynamics | Paris, Texas | Visit site |
| Hynes Industries | Austintown, Ohio | Visit site |
| HyperStrong | Burk's Falls, Ontario | Visit site |
| Hyperthermics | Ulsteinvik, Møre og Romsdal | Visit site |
| Hysolis | Escondido, California | Visit site |
| Hyzon | Bolingbrook, Illinois | Visit site |
| Hälg Group | St. Gallen, St. Gallen | Visit site |
| halm elektronik gmbh | Frankfurt am Main, Hesse | Visit site |
| hyCLEANER America | Stuart, Florida | Visit site |