| J&D Electronics Co., Ltd | Seongnam, Gyoenggi-do | Visit site |
| J&F Biogas | Bengaluru, Karnataka | Visit site |
| J&L Build | Potters Bar, England | Visit site |
| J+M Engineering | Philadelphia, Pennsylvania | Visit site |
| J.E.Shurden Construction | Maben, Mississippi | Visit site |
| JAHA Solar | Fushë Kosova, Fushë Kosova | Visit site |
| JBM Energy Solutions | San Diego, California | Visit site |
| JCL Energy | Sharon, Pennsylvania | Visit site |
| JD PRO Solar | Franklin Park, Illinois | Visit site |
| JDC Energy Services, LLC | Trenton, New Jersey | Visit site |
| JEPA | Athina, Attica | Visit site |
| JERA Americas | Houston, Texas | Visit site |
| JERA Nex | London, England | Visit site |
| JFN | Phoenix, Arizona | Visit site |
| JIANGSU TONGLING ELECTRIC CO., LTD | Zhenjiang Shi, Jiangsu | Visit site |
| JIANGXI LEMI ZHONGKE NEW ENERGY CO., LTD | Jiangxi | Visit site |
| JIANGXI TIANZE POWER SUPPLY CO.,LTD. | Yichun Shi, Jiangxi | Visit site |
| JIEYO | HuiZhou Shi, Guangdong | Visit site |
| JINAN DEGA MACHINE CO.,LTD. | Jinan | Visit site |
| JINGOLI Nuclear | Lawrenceville, New Jersey | Visit site |
| JLA Hydro | Assesse, Namur | Visit site |
| JMC Projects (India) Ltd | Mumbai, Maharashtra | Visit site |
| JMHPower | Bethesda, Maryland | Visit site |
| JMTHY VIET NAM PV TECHNOLOGY COMPANY LIMITED | Cixi City, Zhejiang | Visit site |
| JNC TECH Co., Ltd. | 김천시, 경상북도 | Visit site |
| JOANNEUM RESEARCH | Graz, Styria | Visit site |
| JOYKOO | Shenzhen Shi, Guangdong | Visit site |
| JP Cullen | Janesville, Wisconsin | Visit site |
| JPM Silicon | Braunschweig, Lower Saxony | Visit site |
| JR Automation | Holland, Michigan | Visit site |
| JSC AtomStroyExport | Moscow, Moscow | Visit site |
| JSHP Transformer | San Jose, California | Visit site |
| JST Energy | Lake Mary, Florida | Visit site |
| JSolar | Suzhou Shi, Jiangsu | Visit site |
| JT Energy Systems GmbH | Freiberg, Saxony | Visit site |
| JUMO Schweiz | Stäfa, Zürich | Visit site |
| JY Aluminum Solar Frames Co., Ltd | Hàm Thuận Nam, Bình Thuận | Visit site |
| Jackery | Fremont, California | Visit site |
| Jackson Solar, LLC | Jackson, Missouri | Visit site |
| Jacobs | Dallas, Texas | Visit site |
| Jadeed | El Nozha, Cairo | Visit site |
| James Posey Associates, Inc. | Owings Mills, Maryland | Visit site |
| Jan De Nul Group | Capellen, Capellen | Visit site |
| Janitza electronics GmbH | Lahnau, Hesse | Visit site |
| Jaros, Baum & Bolles | New York, New York | Visit site |
| Java Holdings Ltd | Edmonton, Alberta | Visit site |
| Jedson Engineering | Cincinnati, Ohio | Visit site |
| Jefferson Electric, a Voltaris Company | Goodyear, Arizona | Visit site |
| Jiangnan Cable | Wuxi Shi, Jiangsu | Visit site |
| Jiangsu Davinsolar Aluminium Technology Co., Ltd | Wuxi Shi, Jiangsu | Visit site |
| Jiangsu First Power Co., Ltd. | Su Zhou, Jiangsu | Visit site |
| Jiangsu Gomon New Energy Co.,Ltd | Taizhou Shi, Jiangsu | Visit site |
| Jiangsu Green Energy Technology Co.,Ltd | Yangzhong City, Jiangsu | Visit site |
| Jiangsu Highstar Battery Manufacturing Co.,Ltd | Nantong Shi, Jiangsu | Visit site |
| Jiangsu Huachen Transformer Co., Ltd | Xuzhou, Jiangsu | Visit site |
| Jiangsu Yawei Transformer Co., Ltd | Jiangsu | Visit site |
| Jiangxi JingJiu Power Science & Technology Co., LTD. | Jiujiang, Jiangxi | Visit site |
| Jiangyin Sunslew Machinery Equipment Co.,Ltd | Jiangyin, Jiangsu | Visit site |
| Jiecang Linear Motion | Shaoxing Shi, Zhejiang | Visit site |
| Jimmy | Paris, Île-de-France | Visit site |
| JinenU Solar | Taizhou Shi, Jiangsu | Visit site |
| Jinergy | Jingzhong Shi, Shanxi | Visit site |
| Jingdao New Energy | Qingdao Shi, Shandong | Visit site |
| Jingnoo New Energy | Shenzhen Shi, Guangdong | · |
| Jingoli Power, LLC | Lawrence Township, New Jersey | Visit site |
| Jingxin Science and Technology | Tangshan Shi, Hebei | Visit site |
| JinkoCn | Shenzhen Shi, Guangdong | Visit site |
| JinkoSolar | Shanghai, Shanghai | Visit site |
| Jinrun Electronics Co., Ltd. | Guangdong | Visit site |
| Jinyou Jinhong | Shanghai, Shanghai | Visit site |
| JnTech | Hefei Shi, Anhui | Visit site |
| John Cullen Lighting | London, England | Visit site |
| John Laing | London, England | Visit site |
| John Sisk & Son Ltd | Tallaght, County Dublin | Visit site |
| Johns Hopkins Technology Ventures (JHTV) | Baltimore, Maryland | Visit site |
| Johns Manville | Denver, Colorado | Visit site |
| Jolywood Solar | Milano, Milan | Visit site |
| Jomar Electrical Contractors | Houston, Texas | Visit site |
| Jonas & Redmann Automationstechnik GmbH | Berlin | Visit site |
| Jones Engineering | Dublin, Dublin | Visit site |
| Jones Power | Hattiesburg, Mississippi | Visit site |
| Jordan Transformer LLC | Jordan, Minnesota | Visit site |
| JoulWatt Technology | Drytown, California | Visit site |
| Joule Group | London, England | Visit site |
| Juncess Energy | Suzhou Shi, Jiangsu | · |
| Junda New Energy | 高雄市, Kaohsiung | Visit site |
| Junia Holdings Inc | Middletown, DE | Visit site |
| Junna Solar | Hyderabad, Telangana | Visit site |
| Jupiter International Limited | Kolkata, West Bengal | Visit site |
| Jupiter Power | Austin, Texas | Visit site |
| Jurong Engineering Limited | Singapore, South West Community Development Council | Visit site |
| Just Solar | St. Petersburg, Florida | Visit site |
| Juxin Energy | Wuxi Shi, Jiangsu | Visit site |
| john becker ingenieure GmbH & Co. KG | Lilienthal, Lower Saxony | Visit site |