See who will be at Solar Power Puerto Rico 2019. Updated as of 4/29/19.
| 3D Solar, LLC | innovus Power | S-5! |
| ABB, Inc. | Integrated Storage Technologie | Sage Renewables |
| Accencore | Inversol LLC | Sail Relief |
| AceClamp PMC Industries | iPR Pharmaceutical, Inc. | SCB Group |
| Adam Sollner | Ironridge | Schneider Electric |
| Adsuar Muniz Goyco Seda & Pere | ISO Group PR | Senate of Puerto Rico |
| Allied Building Products Corp. | Jiangsu Seraphim Solar System | SESA-PR |
| Alpha 3 Residential LLC | Juapi Project Services, LLC | Silfab Solar |
| AlsoEnergy, LLC | Krannich Solar USA | SMA America, LLC |
| altE Store | KSK Management Solution | Smart Electric Power Alliance |
| Alten Energy | Langan | Solar Connections International |
| Always Energy Solutions LLC | Leclanche | Solar Energy Industries Association |
| American Wire Group | Liceo Arte y Tecnologia | Solar Energy International |
| AOR Solar LLC Solaora | Lumin | Solar Energy Trade Shows, LLC |
| AOR Solar, LLC | LuminSmart | Solar Head of State |
| APX, Inc. | Marvel Architects PLLC | Solar Libre |
| Battery Specialists PR | Maximo Solar Industries | Solar Roots, LLC |
| BLDM | McConnell Valdes LLC | SolarEdge |
| Blue Planet Energy | Mechannika Inc. | SolarIsland Energy |
| BMR Energy LLC | Melpro | Solarland USA Corporation |
| Borrego Solar Systems, Inc. | MERITECH POWER LIMITED | SolarTech Direct |
| Bright Point INc. | MFS Solar | Solartech PR |
| Caribbean Energy Distributors | Miles Consulting | SolPad |
| CED Greentech | Mission Solar Energy | SonLight Power |
| Celsia | Monllor Capital Partners | Sonnen, Inc. |
| Cenergys | Mujeres del Islas | Southern Fisheries |
| Center Investigative Journalist | National PFG | SUN HOUZ |
| Chint Power Systems America | Navigant Consulting, Inc. | Sun Power Energy LLC |
| Clinton Foundation | NEG INC | SunCast |
| CM Contractor | Nelson Mullins | SunHouz |
| Cogenient.com / Battery USA | New Energy | SunModo Corporation |
| CPS | New Energy Consultants LLC. | Sunnova Energy Corp. |
| DC Battery Specialists | New Energy Nexus / CalCEF | Sunpower |
| DEDC | New Energy Puerto Rico | Sunrun |
| DEPCOM POWER | New York Power Authority | Sustainable Power Systems, Inc |
| DESIGN BUILD LLC | Newpowa America Inc. | Tabuchi Electric America |
| Direct Relief | Northern Electric and Power LLC | Teksol Integration Group |
| DMCG | NREL | Telenetworks, Inc. |
| Doña Yiya, Inc. | NYS Department of Labor | Tesla |
| Dynamic Solar Solutions | NYSERDA | The Solar Foundation |
| E8 Energy Group | Ocean Mountain LLC | The Solaria Corp |
| EcoElectrica | OMCO Solar | THESAN USA CORP |
| Ecogy Energy | OneUP | TRC |
| Eco-NRG Llc | Origis Energy US | Trojan Battery |
| EDF | OutBack Power Technologies | U.S. Department of Energy |
| Enel Green Power North America | Panasonic | Unirac, Inc. |
| ENERGTECH LLC | Panasonic Eco Solutions | Universal Solar Products |
| Enphase Energy, Inc. | Pason Power | University of Central Florida |
| Environmental Defense Fund | Pika Energy | University of Puerto Rico |
| Everest Solar Systems, LLC | Planet Solar | UPRM |
| FCPR | Polytechnic University of PR | URIEL RENEWABLES INC |
| Fluence, a Siemens and AES Co. | Portalatin Solar Energy | US Department of Energy |
| Fortress Power | PREPA | Vidal Nieves & Bauza |
| Fundación Colibrí | PRIDCO | VIG ENGINEERS, PSC |
| Gaia Electrical Contractors In | PROINSO USA | Warren-ECM |
| Geronimo Energy | Pura Energia | Wartsila North America, Inc. |
| Ginlong Solis | Quanta Government Solutions | West Powes Solar LLC |
| Glenn International | Quick Mount PV | Wholesale Electric Caribe, Inc |
| Goldman Antonetti&Cordova,LLC | Radiant Solar | Windmar |
| Green Link, Inc. | ReNOVA Engineering Group, PSC | Windmar Energy |
| Grow Solar LATAM, LLC | Resilient Power Puerto Rico | World Technology Supply |
| Hanwha Q CELLS America Inc. | RG Engineering, Inc | Worldwide Capital Connections |
| High Tech Energy Group | RL Legal & Consulting Services | Yarotek PR, LLC |
| IBTS | RMI | YB ENERGY SOLUTIONS C.P. |
| ICSE-PR | Rolls Battery Engineering | Zona solar |