See who will be at Solar Power Puerto Rico 2019. Updated as of 4/18/19.
| 3D Solar LLC | Glenn International | RG Engineering Inc |
| ABB Inc. | Green Link Inc. | RL Legal & Consulting Services |
| AceClamp PMC Industries | Hanwha Q CELLS America Inc. | RMI |
| Adsuar Muniz Goyco Seda & Pere | IBTS | Rolls Battery Engineering |
| Allied Building Products Corp. | InverSOL | S-5! |
| Alpha 3 Residential LLC | Inversol LLC | Senate of Puerto Rico |
| AlsoEnergy LLC | Ironridge | SMA America LLC |
| American Wire Group | Jiangsu Seraphim Solar System | Smart Electric Power Alliance |
| AOR Solar LLC | Juapi Project Services LLC | Solar Connections International |
| Battery Specialists PR | Krannich Solar USA | Solar Energy Industries Association |
| Blue Planet Energy | Langan | Solar Energy Trade Shows LLC |
| BMR Energy LLC | Leclanche | Solar Roots LLC |
| Borrego Solar | Lumin | Solarland USA Corporation |
| CED Greentech | LuminSmart | SonLight Power |
| Cenergys | Maximo Solar Industries | Sonnen Inc. |
| Center Investigative Journalism | MERITECH POWER LIMITED | SunModo Corporation |
| Chint Power Systems America | MFS Solar | Sunnova |
| Clinton Foundation | Mission Solar Energy | Sunpower |
| Cogenient.com / Battery USA | National PFG | Sunrun |
| CPS | Navigant Consulting Inc. | Sustainable Power Systems Inc |
| DC Battery Specialists | Nelson Mullins | Tabuchi Electric America |
| DEPCOM POWER | New Energy Nexus / CalCEF | Teksol Integration Group |
| DMCG | New York Power Authority | Tesla |
| Dynamic Solar | Newpowa America Inc. | TRC |
| Dynamic Solar Solutions | Northern Electric and Power LLC | U.S. Department of Energy |
| E8 Energy Group | OMCO Solar | Universal Solar Products |
| EcoElectrica | Origis Energy US | URIEL RENEWABLES INC |
| Ecogy Energy | OutBack Power | VIG ENGINEERS PSC |
| Enel Green Power North America | Panasonic Eco Solutions | Warren-ECM |
| Environmental Defense Fund | Pika Energy | Windmar Energy |
| Everest Solar Systems | PROINSO USA | World Technology Supply |
| Geronimo Energy | Quanta Government Solutions | WORLD TECHNOLOGY SUPPLY CORP. |
| Ginlong Solis | Resilient Power Puerto Rico | Yarotek PR LLC |