| G&S Electrical Solution | Lima | Visit site |
| G.E.O.S. Ingenieurgesellschaft mbH | Halsbrücke, Saxony | Visit site |
| G5 INSTRUMENTOS | Curitiba, Paraná | Visit site |
| GAC Group | Jebel Ali, Dubai | Visit site |
| GAMA Power Systems | Yenimahalle, Ankara | Visit site |
| GAMUDA | Petaling Jaya, Selangor | Visit site |
| GANELEC | Johannesburg, Gauteng | Visit site |
| GANEX | Gaspé, Quebec | Visit site |
| GAYK North America | Tucson, AZ | Visit site |
| GB Equipment | Escondido, California | Visit site |
| GBE Battery | Orgiano, Vicenza | Visit site |
| GBP K.K. | Ibaraki | Visit site |
| GDM Assets | Nea Chalkidona, Attica | Visit site |
| GDTech Engineering | Bordes, Pyrénées-Atlantiques | Visit site |
| GE Hitachi Nuclear Energy | Wilmington, North Carolina | Visit site |
| GE Lighting, a Savant company | East Cleveland, Ohio | Visit site |
| GE Vernova | Boston, Massachusetts | Visit site |
| GE4ALL B.V. | Hoofddorp, North Holland | Visit site |
| GEDA USA, LLC | League City, Texas | Visit site |
| GEF | Arlington, Virginia | Visit site |
| GEHECO | Delft, South Holland | Visit site |
| GEK TERNA Group of Companies | Athina, Attica | Visit site |
| GEM Solutions UK Ltd | Nottingham, England | Visit site |
| GENEX ENERGY | Perth, Western Australia | Visit site |
| GEOLUX , Lda | Braga, Braga | Visit site |
| GEOS Energía | Monterrey, Nuevo León | Visit site |
| GF Hydrogen Europe GmbH | Frankfurt am Main, Hesse | Visit site |
| GGGI Cambodia | Phnom Penh, Phnom Penh | Visit site |
| GIC | Singapore, Central Singapore Community Development Council | Visit site |
| GIGA.GREEN | Berlin, Berlin | Visit site |
| GIGATONS | Abu Dhabi, Abu Dhabi | Visit site |
| GIMELEC | Paris, Île-de-France | Visit site |
| GIS Renewable Energy Colombia S.A.S | Barranquilla, Atlántico | Visit site |
| GK Polimex Mostostal | Warszawa, Masovian Voivodeship | Visit site |
| GLE MMC - Green Life Engineering | Baku, Baku | Visit site |
| GLSG Solar Australia Pty Ltd | Brisbane, Queensland | Visit site |
| GM Envolve | Warren, Michigan | Visit site |
| GMDE | Shanghai, Shanghai | Visit site |
| GME Group | Buenos Aires, Buenos Aires | Visit site |
| GME Supply | Columbia, Missouri | Visit site |
| GMR Group | New Delhi, Delhi | Visit site |
| GO Electric | El Cajon, California | Visit site |
| GODSEND Solar | Manila, Manila | Visit site |
| GOP German Offgrid Power | Unterensingen, Baden-Württemberg | Visit site |
| GOPA Infra | Bad Homburg vor der Höhe, Hesse | Visit site |
| GOPA PACE | Woluwe-Saint-Pierre, Brussels-Capital | Visit site |
| GOPA Worldwide Consultants | Bad Homburg vor der Höhe, Hesse | Visit site |
| GP Eco Solutions India Ltd. | Noida, Uttar Pradesh | Visit site |
| GPES Green Projects Pvt. Ltd. | Noida, Uttar Pradesh | Visit site |
| GPRS | Birmingham, Alabama | Visit site |
| GR ENERGIES | Merdrignac, Côtes-d'Armor | Visit site |
| GREEN GENIUS | Vilnius, Vilnius | Visit site |
| GREEN | Greek Environmental & Energy Network SA | Pireas, Attica | Visit site |
| GREW Solar | Ahmedabad, Gujarat | Visit site |
| GRIDiNFY | Mulshi, Maharashtra | Visit site |
| GRIPS Energy | Berlin, Berlin | Visit site |
| GRL Electric | Zhejiang | Visit site |
| GROUPE CORIANCE | Île-de-France | Visit site |
| GROUPE GAGNERAUD | · | Visit site |
| GROUPE LANSARD | Argonay, Haute-Savoie | Visit site |
| GRPOWER | Paris, Île-de-France | Visit site |
| GRS | Alcobendas, Madrid | Visit site |
| GRT Utilicorp, Inc. | Wooster, OH | Visit site |
| GRUPO ALBANESI | Passos, Minas Gerais | Visit site |
| GRUPO ENER | Goiás | Visit site |
| GRUPO ENERGÉTICO DE LAS AMERICAS S.A.S E.S.P | Barranquilla, Atlántico | Visit site |
| GRUPO INSOELEC PERU | San Miguel, Lima Province | Visit site |
| GRUPO NEOELECTRA | Sant Just Desvern, Barcelona | Visit site |
| GRUPO ZARAGOZÁ | València, Valencia | Visit site |
| GRÜNSTATTGRAU | Vienna, Vienna | Visit site |
| GS Yuasa | 京都市, Kyoto | Visit site |
| GSI Environmental Inc. | Houston, Texas | Visit site |
| GSI Geo-Synthetics Systems LLC | Waukesha, Wisconsin | Visit site |
| GSM Services | Gastonia, North Carolina | Visit site |
| GSMA Foundation | Atlanta, Georgia | Visit site |
| GSMT-Enerzinx-JV | Melbourne, Victoria | Visit site |
| GSOLAR POWER CO.,LTD | Xi'an, Shaanxi | Visit site |
| GSR Electric | Dubai, Dubai | Visit site |
| GT Coperture Civili e Industriali srl | Codogno, Lodi | Visit site |
| GTEL - GRUPO TÉCNICO DE ELETROMECÂNICA S.A. | São Paulo, São Paulo | Visit site |
| GTS SOLAR | Crissier, Vaud | Visit site |
| GULF-TECH AUTOMATION | Jebel Ali, Dubai | Visit site |
| GWE BIOGAS LTD | Driffield, England | Visit site |
| Gage Bilt, Inc. | Clinton Township, Michigan | Visit site |
| Galaxy Wire & Cable | Horsham, Pennsylvania | Visit site |
| Galfar Engineering & Contracting Co. W.L.L Emirates | Abu Dhabi, Abu Dhabi | Visit site |
| Galfar Engineering & Contracting SAOG | مَسْقَط, Muscat Governorate | Visit site |
| Galix Solaire | Wasselonne, Bas-Rhin | Visit site |
| Galliford Try | Uxbridge, England | Visit site |
| Galo Energy | New Delhi, Delhi | Visit site |
| Galveston LNG Bunker Port | Houston, Texas | Visit site |
| Gamco Energy | Altıeylül, Balıkesir | Visit site |
| GameChange Solar | Bahia | Visit site |
| Gamesa Electric | Zamudio, Biscay | Visit site |
| Gamma Green Recycles | Lahore, Punjab | Visit site |
| Gandhar Oil Refinery India Ltd | Mumbai, Maharashtra | Visit site |
| Gaoda Solar | Zhejiang | Visit site |
| Gaojing Photovoltaic | Hebei | Visit site |
| Garrigues | Madrid, Madrid | Visit site |
| Gasgene | Nanping Shi, Fujian | Visit site |
| Gate 46 | Gold Coast, Queensland | Visit site |
| Gautam Solar Pvt Ltd | New Delhi, Delhi | Visit site |
| Gauzy | Tel Aviv-Yafo, Tel Aviv District | Visit site |
| Gavia Environmental Ltd | Perth, Scotland | Visit site |
| Gaylor Electric, Inc. | Indianapolis, Indiana | Visit site |
| GeWiS Engineering India Pvt Ltd | Pune, Maharashtra | Visit site |
| Geco Renew Group | Pompei, Naples | Visit site |
| Geco Renewable Energy | Fuoshan Shi, Guangdong | Visit site |
| Gedik Yatırım | Istanbul | Visit site |
| Geenex | Charlotte, North Carolina | Visit site |
| Gelion | Sydney, New South Wales | Visit site |
| Gen2 Energy | Borre, Vestfold | Visit site |
| GenCell Energy | Petah Tikva, Central District | Visit site |
| GenSystems Power Solutions | Houston, Texas | Visit site |
| Generac Power Systems Inc. | Waukesha, Wisconsin | Visit site |
| Generadora Metropolitana | Las Condes, Santiago Metropolitan Region | Visit site |
| General Atlantic | New York, New York | Visit site |
| General Specialties | Sandpoint, Idaho | Visit site |
| Genial Investimentos | Guarulhos, São Paulo | Visit site |
| GenixGreen | · | Visit site |
| Genpact | New York, New York | Visit site |
| Genscape - now part of Wood Mackenzie | London, England | Visit site |
| Genuine H2 | Sydney, New South Wales | Visit site |
| GenusPlus Group | Perth, Western Australia | Visit site |
| GeoAlaska LLC | Anchorage, Alaska | Visit site |
| Geointegral | Córdoba, Córdoba | Visit site |
| Geoneon | Hobart, Tasmania | Visit site |
| Georgia Power Company | Atlanta, Georgia | Visit site |
| Geosolaris | Montecastello, Alessandria | Visit site |
| Geostudiogroup Stp | Scicli, Ragusa | Visit site |
| Geosurv Pty Ltd | Sydney, New South Wales | Visit site |
| Geotek Limited | Daventry, England | Visit site |
| Geotek do Brasil | Belo Horizonte, Minas Gerais | Visit site |
| Geovert | Sydney, New South Wales | Visit site |
| Geowarmth | North Shields, England | Visit site |
| Gephart Electric | Vadnais Heights, Minnesota | Visit site |
| Gerchamp | Hangzhou Shi, Zhejiang | Visit site |
| Gerdau North America | Tampa, Florida | Visit site |
| German Aerospace Center (DLR) | Köln, North Rhine-Westphalia | Visit site |
| German Energy Solutions Initiative | Hannover, Lower Saxony | Visit site |
| German Energy Solutions Initiative of the Federal Ministry for Economic Affairs and Climate Action | Berlin, Berlin | Visit site |
| GermanSolar | 楊梅區, Taoyuan | Visit site |
| Geronimo Power | Bloomington, Minnesota | Visit site |
| Gerpaas | Maltepe, Istanbul | Visit site |
| Get Solar Labels | Riverside, CA | Visit site |
| GetMy Solutions Pvt Ltd | Pimpri-Chinchwad, Maharashtra | Visit site |
| Geya Electrical | Wenzhou Shi, Zhejiang | Visit site |
| Giant Leap | Melbourne, Victoria | Visit site |
| Gideon Goldmann | New York, New York | Visit site |
| Giga Energy | League City, Texas | Visit site |