| InnoTech Engineering Inc. | Lebrija, Spain | · |
| InnoVent | Villeneuve-d'Ascq, France | Visit site |
| Innova Sun | San Francisco del Rincón, Mexico | Visit site |
| Innovations Bangalore | Chitradurga, India | Visit site |
| Innovcable | Dois Córregos, Brazil | Visit site |
| Innovo Renewables S.p.A. | Milano, Italy | Visit site |
| Innowell Group | Chennai, India | Visit site |
| Innowell Group | Bengaluru, India | Visit site |
| Innowell Group | Dhaka, Bangladesh | Visit site |
| Innowell Group | Hyderabad, India | Visit site |
| Innowell Group | Melbourne, Australia | Visit site |
| Innowell Group | Sivakasi, India | Visit site |
| Innowell Group | Dubai, United Arab Emirates | Visit site |
| Innowind Energy Solutions | Cambridge, Canada | Visit site |
| Innpact | Luxembourg, Luxembourg | Visit site |
| Innpact | Tamarin, Mauritius | Visit site |
| Inogen Energy Technologies and Investments | Monheim am Rhein, Germany | Visit site |
| Inovtech | Metamorfosi, Greece | · |
| Inox Wind Ltd. | Noida, India | Visit site |
| Inpasa | São Paulo, Brazil | Visit site |
| Inpasa | Brazil | Visit site |
| Inpasa | Paraguay | Visit site |
| Inpasa | Rondonópolis, Brazil | Visit site |
| Inpasa | Nova Mutum, Brazil | Visit site |
| Inpasa | Rio Verde, Brazil | Visit site |
| Inscio Roofs | IJsselstein, Netherlands | Visit site |
| Insolation Energy (INA) | New Delhi, India | Visit site |
| Inspire Clean Energy | Mumbai, India | Visit site |
| Inspire Clean Energy | Chennai, India | Visit site |
| Insta GmbH | Lüdenscheid, Germany | Visit site |
| Instalaciones Tecnológicas JMJ | Castalla, Spain | Visit site |
| Installatøren Gruppen | Rolvsøy, Norway | Visit site |
| Installatøren Gruppen | Oslo, Norway | Visit site |
| Institut National de l'Économie Circulaire (INEC) | Paris, France | Visit site |
| Institut Photovoltaïque d'Ile-de-France (IPVF) | Düsseldorf, Germany | Visit site |
| Instrumentos y Controles S.A. | Bogotá, Colombia | Visit site |
| Instrumentos y Controles S.A. | Sopó, Colombia | Visit site |
| IntES International Engineering Solutions | Amsterdam, Netherlands | Visit site |
| Intecsa | Madrid, Spain | Visit site |
| Integral RISE | Maadi, Egypt | Visit site |
| Integral RISE | Ismailia, Egypt | Visit site |
| Integrated Wind Solutions ASA | Oslo, Norway | Visit site |
| Integrum Energy | Bengaluru, India | Visit site |
| Intelbras | São José, Brazil | Visit site |
| IntelliSpatial | Perth, Australia | Visit site |
| Intellimeter | Pickering, Canada | Visit site |
| Intello Tech AMC | New Delhi, India | · |
| Inter Solar Systems | Chandigarh, India | Visit site |
| InterBolt | Bury St. Edmunds, United Kingdom | Visit site |
| InterContinental Energy | Singapore, Singapore | Visit site |
| Interlink Alternative Energy | Parklands, Australia | Visit site |
| International Quest Engineering Ltd. | Prince George, Canada | Visit site |
| International Solar Alliance | Gurugram, India | Visit site |
| Interpath | London, United Kingdom | Visit site |
| Intertechne | Curitiba, Brazil | Visit site |
| Intertechne | São Paulo, Brazil | Visit site |
| Intertechne | Rio de Janeiro, Brazil | Visit site |
| Intertechne | Salvador, Brazil | Visit site |
| Intertechne | Macaé, Brazil | Visit site |
| Intertechne | Porto Alegre, Brazil | Visit site |
| Intertechne | Belo Horizonte, Brazil | Visit site |
| Intertechne | Jaraguá do Sul, Brazil | Visit site |
| Intherpro LLC | Macapá, Brazil | Visit site |
| Intherpro LLC | Abu Dhabi, United Arab Emirates | Visit site |
| Intherpro LLC | Dubai, United Arab Emirates | Visit site |
| Intherpro LLC | Sharjah, United Arab Emirates | Visit site |
| Intherpro LLC | United Arab Emirates | Visit site |
| Inthy | Paris, France | Visit site |
| Intrax Consulting Group | Melbourne, Australia | Visit site |
| Inventronics | Hangzhou Shi, China | Visit site |
| Inventum Technologies B.V. | Houten, Netherlands | Visit site |
| InverPower Sdn Bhd | Subang Jaya, Malaysia | · |
| Inverter Service Group | Karlstein am Main, Germany | Visit site |
| Inverter Service Spain | Logroño, Spain | Visit site |
| Invest India | New Delhi, India | Visit site |
| Investerra AG | St. Gallen, Switzerland | Visit site |
| Investment Management Corporation of Ontario (IMCO) | Toronto, Canada | Visit site |
| Invicto Energia Solar | Maringá, Brazil | Visit site |
| Ipvisola Norge as | Ågotnes, Norway | Visit site |
| Iqony Sens - Iqony Sustainable Energy Solutions | Würzburg, Germany | Visit site |
| Irish Solar Energy Association (ISEA) | Dublin, Ireland | Visit site |
| Iron Energy AG | Zürich, Switzerland | Visit site |
| Ishraq Energy | الجامعة, Jordan | Visit site |
| Isifloating | Beneixama, Spain | Visit site |
| Isii-Tech | Saint-Étienne-du-Rouvray, France | Visit site |
| IslaSol | Culebra, Puerto Rico | Visit site |
| Island Green Power | London, United Kingdom | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | Goiás, Brazil | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | Anápolis, Brazil | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | São José dos Pinhais, Brazil | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | Várzea Grande, Brazil | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | Castanhal, Brazil | Visit site |
| Isoeste Construtivos Isotérmicos Ltda. | Vitória de Santo Antão, Brazil | Visit site |
| Isotec Enerji | Dilovası, Türkiye | Visit site |
| Italian Geothermal Forum | Roma, Italy | Visit site |
| Italian Geothermal Forum | Milano, Italy | Visit site |
| Italweber | Assago, Italy | · |
| Ivosis Group | Eyyübiye, Türkiye | Visit site |
| Ivosis Group | Onikişubat, Türkiye | Visit site |
| Ivosis Group | Erlangen, Germany | Visit site |
| J&F Biogas | Bengaluru, India | Visit site |
| J&L Build | Potters Bar, United Kingdom | Visit site |
| JA Solar | Beijing, China | Visit site |
| JA Solar | Shanghai, China | Visit site |
| JAHA Solar | Fushë Kosova, Kosovo | Visit site |
| JAKSON SOLAR (Modules, Cells & Rooftop Solutions) | Noida, India | Visit site |
| JASBEL Energy | Nairobi, Kenya | Visit site |
| JB Battery | China | · |
| JEPA | Athina, Greece | Visit site |
| JERA Nex | London, United Kingdom | Visit site |
| JESA S.A | Casablanca, Morocco | Visit site |
| JET Charge | Melbourne, Australia | Visit site |
| JFK Projects | Perth, Australia | Visit site |
| JFW Renewables | Loughrea, Ireland | · |
| JFY TECH | Shenzhen Shi, China | Visit site |
| JGD District Heating | Salford, United Kingdom | Visit site |
| JGH Solar | København, Denmark | · |
| JIANGXI TIANZE POWER SUPPLY CO.,LTD. | Yichun Shi, China | Visit site |
| JJ PV Solar | Kotda Sangani, India | Visit site |
| JLA Hydro | Assesse, Belgium | Visit site |
| JLR | Ottawa, Canada | Visit site |
| JM ProjektInvest GmbH & Co. KG | Magdeburg, Germany | Visit site |
| JMC Projects (India) Ltd | Mumbai, India | Visit site |
| JOANNEUM RESEARCH | Graz, Austria | Visit site |
| JPM Silicon | Braunschweig, Germany | Visit site |
| JSC AtomStroyExport | Moscow, Russia | Visit site |
| JSE Engineering Pvt Ltd | Chennai, India | Visit site |
| JT Energy Systems GmbH | Freiberg, Germany | Visit site |
| JUMO Schweiz | Stäfa, Switzerland | Visit site |
| JUMO Schweiz | Switzerland | Visit site |
| JUPOWER | Shanghai, China | Visit site |
| JUWI Group | Wörrstadt, Germany | · |
| JUWI South Africa | Cape Town, South Africa | · |
| JV Group - A Solar Company | Ferizaj, Kosovo | · |
| JX ELECTRONICS CO.,LTD | China | Visit site |
| JYC Battery Manufacturer | Shaoguan Shi, China | Visit site |
| JZNEE | Wuxi Shi, China | Visit site |
| Jadeed | El Nozha, Egypt | Visit site |
| Jadeed | Cairo, Egypt | Visit site |
| Jakson Group | Ghaziabad, India | Visit site |
| Jan De Nul Group | Capellen, Luxembourg | Visit site |
| Janitza electronics GmbH | Lahnau, Germany | Visit site |
| JansZon BV | Amsterdam, Netherlands | Visit site |
| Japan Energy Hub | Japan | Visit site |
| Java Holdings Ltd | Edmonton, Canada | Visit site |
| Java Holdings Ltd | Nisku, Canada | Visit site |
| Jaza | Halifax, Canada | Visit site |
| Jema Energy | Power Conversion Systems | Lasarte-Oria, Spain | Visit site |
| Jena Flow Batteries GmbH | Jena, Germany | · |
| Jenni Energietechnik AG | Oberburg, Switzerland | · |