| BlueNetCat | Barcelona, Spain | Visit site |
| BlueNewables | Girona, Spain | Visit site |
| BlueTec AS | Tønsberg, Norway | Visit site |
| Bluebird Solar | Sas Nagar, India | Visit site |
| Blueleaf Energy | Singapore, Singapore | Visit site |
| Bluemethane | London, United Kingdom | Visit site |
| Bluesky International Limited, a Woolpert Company | Ashby-de-la-Zouch, United Kingdom | Visit site |
| Bluestone Energy Limited | London, United Kingdom | Visit site |
| Bluestream Renewables | Singapore, Singapore | Visit site |
| Bluesun Solar | Hefei Shi, China | Visit site |
| Bluewater Energy Inc. | Guelph, Canada | · |
| Bluint | Mire de Tibães, Portugal | · |
| Blykalla | Stockholm, Sweden | Visit site |
| BnM | Droichead Nua, Ireland | Visit site |
| Bnewable | Mechelen, Belgium | Visit site |
| Bold Energy | Santa Catarina Island, Brazil | Visit site |
| Boley Geotechnik GmbH | München, Germany | Visit site |
| Bolt Industries Sdn Bhd | Kuala Lumpur, Malaysia | Visit site |
| Bolt Solar Company | Rawalpindi, Pakistan | · |
| Boltpower | China | Visit site |
| BonGo Solar B.V. | Apeldoorn, Netherlands | Visit site |
| Bondada Group | Secunderabad, India | Visit site |
| Bonnen Battery | Changsha Shi, China | Visit site |
| Bonobo Energy | Córdoba, Spain | Visit site |
| Boomerang Labs | Australia | South West Rocks, Australia | Visit site |
| Boond Engineering and Development Pvt. Ltd. | New Delhi, India | Visit site |
| Boost Design Australia | Sydney, Australia | Visit site |
| Bord na Móna | Droichead Nua, Ireland | Visit site |
| Borick Solar | Tashkent, Uzbekistan | Visit site |
| Borobotics AG | Winterthur, Switzerland | · |
| Borosil Limited | Mumbai, India | Visit site |
| Borosil Scientific | Ajmer, India | Visit site |
| Borri | Bibbiena, Italy | Visit site |
| Borusan EnBW Enerji | Beyoğlu, Türkiye | Visit site |
| Bosa Energy | Jingmen Shi, China | · |
| Bosch Home Comfort Deutschland | Wernau, Germany | · |
| Bosch Home Comfort Group | Wetzlar, Germany | · |
| Bosch Rexroth | Lohr am Main, Germany | Visit site |
| Boson Energy | Luxembourg, Luxembourg | Visit site |
| Bossi Energia Solar | Campinas, Brazil | · |
| Bosswerk | Nettetal, Germany | Visit site |
| Boston Energy | Beverley, United Kingdom | Visit site |
| Boult Utilities | Wallasey, United Kingdom | Visit site |
| Boundary Electric | Grand Forks, Canada | Visit site |
| Boutique Solar Co | Yanchep, Australia | Visit site |
| Bouwbedrijf Furnibo | Veurne, Belgium | Visit site |
| Bouygues Construction | Saint-Quentin, France | Visit site |
| Bouygues Energies & Services | Guyancourt, France | Visit site |
| Bouygues Group | Paris, France | Visit site |
| Boyang Energy Technology | Xi'an Shi, China | Visit site |
| BraSol | Póvoa de Varzim, Portugal | · |
| Bramble Energy Limited | Crawley, United Kingdom | · |
| Brametal | Linhares, Brazil | Visit site |
| Brassunny Energia Solar | Piracicaba, Brazil | Visit site |
| Bredenoord | Apeldoorn, Netherlands | · |
| Breffni Renewables ltd. | Bailieborough, Ireland | Visit site |
| Brenmiller Energy | Rosh HaAyin, Israel | · |
| Bridgeable | Toronto, Canada | Visit site |
| Bridgin Power | Singapore, Singapore | Visit site |
| Bright Earth Solar | Adelaide, Australia | Visit site |
| Bright Energy | Gent, Belgium | · |
| Bright Inc | Mexico City, Mexico | Visit site |
| Bright Renewables | Enschede, Netherlands | · |
| Bright Star Solar | Doha, Qatar | Visit site |
| BrightSource Energy | Jerusalem, Israel | Visit site |
| BrightWind | Dublin, Ireland | Visit site |
| BrightWind | Ireland | Visit site |
| Brighte | Sydney, Australia | Visit site |
| Brightworks Energy Inc. | Whitby, Canada | Visit site |
| Brilliant water solutions | Rotterdam, Netherlands | Visit site |
| Bring Energy | London, United Kingdom | Visit site |
| Briscon Energy Private Limited | Ahmedabad, India | · |
| Bristol Climate & Nature Partnership | Bristol, United Kingdom | Visit site |
| British Solar Renewables | Chard, United Kingdom | · |
| Broad New Energy | Xiamen Shi, China | Visit site |
| Broadstone Capital Advisors | London, United Kingdom | Visit site |
| Bronzeoak, Inc | Taguig, Philippines | Visit site |
| Broptimize Energy | Remicourt, Belgium | Visit site |
| Brusol | Jette, Belgium | Visit site |
| Buccaneer Delft | Delft, Netherlands | Visit site |
| Buchan Offshore Wind | Glasgow, United Kingdom | Visit site |
| Buderus Schweiz | Pratteln, Switzerland | · |
| Budimex | Warszawa, Poland | Visit site |
| Buhari Energy | Istanbul, Türkiye | Visit site |
| Build to Zero | Sevilla, Spain | · |
| BuildLovers | Barcelona, Spain | Visit site |
| Built Environs | Adelaide, Australia | Visit site |
| Bulbe Energia | Belo Horizonte, Brazil | Visit site |
| Bulgarian Solar Company Pltd | Благоевград, Bulgaria | Visit site |
| Bundesministerium für Bildung und Forschung | Berlin, Germany | Visit site |
| Bundesverband Bioenergie (BBE) | Pontevedra, Argentina | Visit site |
| Bundesverband Erneuerbare Energie e.V. (BEE) | Berlin, Germany | Visit site |
| Bundesverband Neue Energiewirtschaft e.V. (bne) | Berlin, Germany | Visit site |
| Bundesverband Photovoltaic Austria | Vienna, Austria | Visit site |
| Bundesverband WindEnergie e.V. | Berlin, Germany | Visit site |
| Bundesverband Wärmepumpe (BWP) e. V. | Berlin, Germany | Visit site |
| Bureau d'études Pierre Berger S.A. | Chaudfontaine, Belgium | Visit site |
| Bureau of Indian Standards | New Delhi, India | Visit site |
| Burns & McDonnell India | Mumbai, India | Visit site |
| Buro Happold | Bath, United Kingdom | Visit site |
| Busbyr New Energy | Shenzhen Shi, China | Visit site |
| Business in Wind | Barneveld, Netherlands | Visit site |
| Buskowitz Group | Makati, Philippines | Visit site |
| Buss Energy Group | Hamburg, Germany | Visit site |
| Buss Offshore Solutions GmbH & Co. KG | Hamburg, Germany | Visit site |
| Bute Energy | Cardiff, United Kingdom | Visit site |
| Buttimer Engineering | Roscrea, Ireland | Visit site |
| Buttimer Engineering | Ireland | Visit site |
| Buttimer Engineering | Poland | Visit site |
| Buttimer Engineering | United Kingdom | Visit site |
| Buttimer Engineering | United Arab Emirates | Visit site |
| Bwitt | China | · |
| ByoMax | Singapore, Singapore | Visit site |
| Bürgersolarpark GmbH | Tangerhütte, Germany | Visit site |
| Bürgerwerke eG | Heidelberg, Germany | Visit site |
| BİOTREND | Beykoz, Türkiye | Visit site |
| C STAR | Cape Town, South Africa | Visit site |
| C Service Srl | Crispiano, Italy | · |
| C-Green | Solna, Sweden | Visit site |
| C-energy | Temse, Belgium | · |
| C2Wind | Aabenraa, Denmark | Visit site |
| CAB ENERGY SRL | Castenedolo, Italy | Visit site |
| CALLUM | Warwick, United Kingdom | Visit site |
| CAMPUS4WIND | München, Germany | Visit site |
| CANOVI COPERTURE SRL | Modena, Italy | Visit site |
| CAPA intelligence | Melbourne, Australia | Visit site |
| CAPE SOLAR PV CONSULTANTS | City of Cape Town, South Africa | Visit site |
| CARMA Corp. | Lindsay, Canada | Visit site |
| CARMA Corp. | Toronto, Canada | Visit site |
| CARMA Corp. | Calgary, Canada | Visit site |
| CARMA Corp. | Vancouver, Canada | Visit site |
| CATENA SERVICES S.R.L. | Osimo, Italy | Visit site |
| CC Electrical & Renewables Ltd | Thetford, United Kingdom | Visit site |
| CCB Energy | Ågotnes, Norway | Visit site |
| CCE | Vienna, Austria | Visit site |
| CCL Group | Colchester, United Kingdom | Visit site |
| CCL Solar Benelux | Houten, Netherlands | Visit site |
| CCM MOOIPLAATS PTY LTD | Cape Town, South Africa | · |
| CDC Biodiversité | Paris, France | Visit site |
| CDC Group plc | London, United Kingdom | Visit site |
| CDS Solar | Dalian Shi, China | Visit site |
| CDWE | 臺北市, Taiwan | Visit site |
| CEC Solar GmbH | Hamburg, Germany | Visit site |
| CECEP Solar | China | Visit site |
| CEEG | Nanjing Shi, China | Visit site |
| CEFEM INDUSTRIES | · | Visit site |
| CEFEM SOLAR | Bernis, France | Visit site |
| CELLARK POWERTECH | Jagatsinghapur, India | Visit site |
| CEN Solutions | Dos Hermanas, Spain | Visit site |
| CENIMAT | i3N | Portugal | Visit site |