| D-GO Mobility | Abrera, Spain | Visit site |
| DAH Gruppe | Oranienburg, Germany | Visit site |
| DAH Solar | China | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Essen, Germany | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Darmstadt, Germany | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Würzburg, Germany | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Berlin, Germany | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Stuttgart, Germany | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Montenegro | Visit site |
| DAHLEM Beratende Ingenieure GmbH & Co. Wasserwirtschaft KG | Albania | Visit site |
| DAS SOLAR | China | Visit site |
| DAUSS Abogados | Barcelona, Spain | Visit site |
| DC3 | Melbourne, Australia | Visit site |
| DCE Conseil | Fougères, France | Visit site |
| DCE Conseil | Radepont, France | Visit site |
| DCE Conseil | Amfreville-la-Mi-Voie, France | Visit site |
| DCE Conseil | Paris, France | Visit site |
| DCE Conseil | Marseille, France | Visit site |
| DCE Conseil | Le Plessis-Belleville, France | Visit site |
| DCE Conseil | Montpellier, France | Visit site |
| DCE Conseil | Le Havre, France | Visit site |
| DCE Conseil | Montigny-le-Bretonneux, France | Visit site |
| DCH Solar | Siegen, Germany | Visit site |
| DCarbon Global | Egypt | Visit site |
| DEC Solar Romania | Bucharest, Romania | Visit site |
| DECAT empowering places | Veurne, Belgium | Visit site |
| DECO Engineering | Dublin, Ireland | Visit site |
| DEESO-GROUP | Gent, Belgium | · |
| DEGERHELLAS | Agii Anargyri, Greece | Visit site |
| DEGERenergie GmbH & Co. KG | Ofterdingen, Germany | Visit site |
| DEKS Industries Australasia | Melbourne, Australia | Visit site |
| DELPHIN™ | Ahmedabad, India | Visit site |
| DENS | Dutch Energy Solutions | Helmond, Netherlands | · |
| DERINSU Offshore | Beşiktaş, Türkiye | Visit site |
| DERINSU Offshore | Çankaya, Türkiye | Visit site |
| DERYA SOLAR ENERJİ | Karatay, Türkiye | Visit site |
| DES Renewable Energy | Wimborne, United Kingdom | Visit site |
| DEWETRON | Raaba-Grambach, Austria | Visit site |
| DF Electric | Cornellà de Llobregat, Spain | Visit site |
| DFI Piling | Edmonton, Canada | Visit site |
| DGS Energie | Tremelo, Belgium | Visit site |
| DGS – Deutsche Gesellschaft für Sonnenenergie Landesverband Berlin Brandenburg e.V. | Berlin, Germany | Visit site |
| DH2 energy | Madrid, Spain | Visit site |
| DHT Solar | Benidoleig, Spain | · |
| DI SOLAR | Rabat, Morocco | Visit site |
| DI SOLAR | Montélimar, France | Visit site |
| DIMAS SA | Argos, Greece | Visit site |
| DIMÉO Énergie | Bron, France | Visit site |
| DIRECT Infrastructure | Sydney, Australia | Visit site |
| DIS Fire New Energy Technologies CN | Yantai Shi, China | Visit site |
| DIS Fire Systems Pty Ltd | Melbourne, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Darwin, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Canberra, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Brisbane, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Hobart, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Adelaide, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Perth, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Sydney, Australia | Visit site |
| DIS Fire Systems Pty Ltd | Yantai Shi, China | Visit site |
| DIS Fire Systems Pty Ltd | China | Visit site |
| DIS Fire Systems Pty Ltd | Wellington, New Zealand | Visit site |
| DIS Fire Systems Pty Ltd | Dubai, United Arab Emirates | Visit site |
| DIS Fire Systems Pty Ltd | Sharjah, United Arab Emirates | Visit site |
| DISTECO GmbH | Weiler, Austria | · |
| DIVESCO INGENIERÍA | Quito, Ecuador | Visit site |
| DIgSILENT GmbH | Gomaringen, Germany | Visit site |
| DK-Automatics | Chennai, India | Visit site |
| DKC | Bellinzago Novarese, Italy | Visit site |
| DLM Capital Group | Lagos, Nigeria | Visit site |
| DMEGC New Energy Battery - Hengdian Group | China | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Vietnam | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Japan | Visit site |
| DMEGC New Energy Battery - Hengdian Group | South Korea | Visit site |
| DMEGC New Energy Battery - Hengdian Group | India | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Indonesia | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Thailand | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Netherlands | Visit site |
| DMEGC New Energy Battery - Hengdian Group | United Kingdom | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Germany | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Slovenia | Visit site |
| DMEGC New Energy Battery - Hengdian Group | France | Visit site |
| DMEGC New Energy Battery - Hengdian Group | United States | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Mexico | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Spain | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Portugal | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Morocco | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Italy | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Poland | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Singapore, Singapore | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Sweden | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Australia | Visit site |
| DMEGC New Energy Battery - Hengdian Group | Brazil | Visit site |
| DMG Blockchain Solutions | Delta, Canada | Visit site |
| DMS Metering Solutions | Nottingham, United Kingdom | Visit site |
| DMT Environmental Technology | Joure, Netherlands | Visit site |
| DN Battery | Ulsan, South Korea | Visit site |
| DNK Power | Shenzhen Shi, China | · |
| DNV - Energy Systems | Høvik, Norway | Visit site |
| DNX Energy | Perth, Australia | Visit site |
| DOME Serviços Integrados | Rio de Janeiro, Brazil | Visit site |
| DOME Serviços Integrados | São João da Barra, Brazil | Visit site |
| DONGJIN BATTERY PAKISTAN | Lahore, Pakistan | Visit site |
| DOĞA SOLAR | Karatay, Türkiye | Visit site |
| DOĞUŞ İNŞAAT VE TİCARET A.Ş. | Sarıyer, Türkiye | Visit site |
| DP CleanTech Co. Ltd | Katowice, Poland | Visit site |
| DPM Enerji A.Ş. | Bornova, Türkiye | Visit site |
| DRAGADOS OFFSHORE | Puerto Real, Spain | Visit site |
| DRAXIS Environmental S.A. | Thessaloniki, Greece | Visit site |
| DS ENERGY | Brisbane, Australia | Visit site |
| DSG Energy | Lahore, Pakistan | · |
| DSPA Aerosol Fire Suppression | Nijmegen, Netherlands | Visit site |
| DTBird & DTBat | Madrid, Spain | Visit site |
| DTDS Technology Pte Ltd., Marubeni Group | Singapore, Singapore | Visit site |
| DTSYS Tech LLP - Helping global businesses scale faster and lower overhead costs. | Bhuj, India | Visit site |
| DVI Wärmepumpen Köln | Köln, Germany | · |
| DVS Solar - Construction, Engineering and Consultancy | Porto, Portugal | Visit site |
| DWS Wind Turbine Service | Stradomno, Poland | Visit site |
| DWS Wind Turbine Service | Iława, Poland | Visit site |
| DYNEX Arabia | Al Khubar, Saudi Arabia | Visit site |
| Dadmann Solar | Yazd, Iran | Visit site |
| Dahua Technology | Hangzhou Shi, China | Visit site |
| Dajcor Aluminum Ltd. | Chatham, Canada | Visit site |
| Dal Elektrik Motorları Ve Güç Aktarım Sistemleri A.Ş | Bahçelievler, Türkiye | Visit site |
| Dal Solar | Bahçelievler, Türkiye | Visit site |
| DalaVind | Falun, Sweden | Visit site |
| Dale Power Solutions | Scarborough, United Kingdom | · |
| Dalkia | Saint-André-lez-Lille, France | Visit site |
| Danisense A/S | Taastrup, Denmark | Visit site |
| Danisense A/S | Poland | Visit site |
| Danish Wind Supervision | Aalborg, Denmark | Visit site |
| Danton Power Private Limited | Noida, India | · |
| Daphaco | Ho Chi Minh City, Vietnam | Visit site |
| Dar | بيروت, Lebanon | Visit site |
| Darcom Energy | Popești Leordeni, Romania | Visit site |
| Darwin Solutions Énergétiques | Québec, Canada | Visit site |
| Data Structures | Blanchardstown, Ireland | Visit site |
| Data Structures | Dublin, Ireland | Visit site |
| Data Structures | Carlisle, United Kingdom | Visit site |
| Dawnice Battery | Yichun Shi, China | Visit site |
| Dawsongroup energy solutions | Milton Keynes, United Kingdom | Visit site |
| Daxieworld | Er'erduosi Shi, China | Visit site |
| Daxing International Hydrogen Energy Demonstration Zone | Beijing, China | Visit site |
| DayStar Solar | Chennai, India | Visit site |
| Daystar Solar | Lagos, Nigeria | Visit site |
| Dazhi Machine Technology | Ningbo Shi, China | Visit site |
| Dazi Solar | Santo Domingo Oeste, Dominican Republic | Visit site |
| DeWarmte | Den Haag, Netherlands | Visit site |
| Decal Renewables | Milano, Italy | Visit site |
| Decal Renewables | Paderno Dugnano, Italy | Visit site |
| Decentral Energy | Johannesburg, South Africa | Visit site |