Below is a list of companies that are attending the in-person expo hall at Solar and Energy Storage 2021.
| 424 Capital |
| 603 Solar LLC |
| Above Grid Solar |
| ACE Solar |
| ACK Smart Energy |
| Advanced Power |
| Advanced Solar Products (ASP) |
| AEE Solar |
| Aegis Renewable Energy Inc. |
| AEI Consultants |
| Aerocompact Inc. |
| Aerotek Inc |
| AK Solar |
| AK Stamping |
| AllEarth Renewables Inc. |
| Allen & Overy LLP |
| AllianceBernstein |
| Altus Group |
| Ameresco |
| Amerex Energy Services |
| American Innotek |
| AMOGREENTECH |
| Amosense |
| Amp Energy |
| AP Alternatives |
| Aptos Solar Technology |
| ARC Design & Consulting LLC |
| Aspen Power Partners |
| Asplundh Engineering Services |
| Associate Energy Developers |
| Assured Solar Energy |
| Atwell LLC |
| Augusta Electrical JATC/ IBEW 1253 |
| Autumn Sky Development |
| Azure Drone Services |
| Barrington Power LLC |
| BayWa r.e. |
| BD Electrical Services |
| Beacon |
| BerryDunn |
| Biodiversity Research Institute |
| Black & Veatch |
| Blackstone Credit |
| BluePath Finance Inc. |
| BlueWave Solar |
| Bohler |
| Bond Civil & Utility Construction |
| Borrego |
| Bot Watt |
| Brightway Energy LLC |
| Bristol Construction |
| Built Well Solar |
| Bureau Veritas North America Inc |
| Burndy |
| CAB Products |
| Campos EPC |
| Capital Power Corporation |
| Catalyze |
| CDS- ALK |
| CED Greentech |
| Centrica |
| Chazen Companies |
| Chem Link |
| Cherrytree Group LLC |
| Clean Energy Group |
| CleanChoice Energy Inc. |
| Cleantap Energy LLC |
| Community Power Partners |
| Competitive Power Ventures |
| Con Edison |
| Control Poiint Associates Inc |
| Convergent Energy + Power |
| CPower Energy Management |
| CPS Energy |
| Crayhill Renewables |
| CRRC Times Electric USA LLC |
| CSG Developers LLC dba Commercial Solar Guy |
| CT |
| CT PURA |
| Current Renewables Engineering Inc |
| Customized Energy Solutions |
| D.A. Collins Companies |
| DCE Solar |
| Devlin Inc |
| Distributed Solar Development |
| DNG Advisory |
| DNV |
| Doosan GridTech |
| Eagleview |
| Earthlight Technologies |
| Eastcom Associates |
| Eaton Corporation |
| Eco Power Systems Inc. |
| EcoFasten |
| Ecosave Inc. |
| EDP Renewables North America |
| Eichenauer Inc. |
| Electric Sunshine LLC |
| EN Engineering |
| Encore Renewable Energy |
| Enerflo |
| Energy Monster |
| Energy Systems Group |
| ENGIE North America |
| Enteligent |
| EnterSolar HQ |
| EPL Solar |
| EQUIX Inc |
| EV Launchpad |
| Eversource Energy |
| EZ Solar |
| First Solar |
| Fischer SIPS |
| Fisher Associates |
| FM Global |
| Foley Hoag LLP |
| Full Tilt by BCI Engineering |
| Garbo-Kane |
| GarboKane Integrated Solar Builders |
| General MicroGrids Inc. |
| Genie Retail Energy |
| Geoscape Solar |
| Ginlong Technologies |
| GoodWe Power Supply |
| Gottschalk Solutions LLC |
| GP JOULE North America |
| GPRS LLC |
| Granite State Solar |
| Green Lantern Solar |
| Green Mountain Power |
| Green Mountain Solar |
| Green Seal Environmental |
| Greenskies Clean Energy |
| Gripple |
| H.BAS Solutions |
| Harmony Energy Works |
| Harvest Power LLC |
| Hexagon Energy LLC |
| Huntsmen Group / SmartOne |
| HYDE ENGINEERING SERVICES INC |
| I.B. Abel |
| IBEW LU. 490 |
| ICAST |
| ICF |
| Infiniti Energy LLC |
| Ingeteam Inc. |
| Innergex Renewable Energy |
| Insight Solar |
| Integrated Solar Builders |
| Integrity Energy |
| Invaleon Solar |
| IronRidge. Inc |
| Island Lighting & Power Systems Inc |
| ISO New England |
| iSun |
| Javelin Capital |
| JinkoSolar (U.S.) Inc. |
| JobNimbus |
| K2 Systems LLC |
| Kendall Sustainable Infrastructure |
| Key Solar LLC |
| Kinect Solar |
| Kleinfelder Inc. |
| KORE Power Inc |
| Krannich Solar USA |
| Kubricky Construction Corp. |
| Kupper Engineering LLC |
| kWh Analytics |
| LaBella Associates |
| Land Use Law Center Pace Law |
| Leclanche NA |
| LG Electronics USA Inc. |
| M Bar C Construction Inc. |
| Maine Audubon |
| Mass Clean Energy Center |
| Mass Power Solutions |
| Massachusetts Clean Energy Center |
| Massachusetts Department if Agricultural Resources |
| Massachusetts Department of Energy Resources |
| McCauley Lyman LLC |
| Media Sector Inc |
| Mill Creek Renewables |
| Mission Solar Energy |
| MOWER |
| MT Solar |
| MVE Group Inc. |
| myPV.pro/Polytech Services |
| National Grid (US) |
| National Roofing & Solar Corporation |
| Nautilus Solar Energy LLC |
| Navisun LLC |
| NBD Solar |
| NEC Solar |
| Neighborhood Sun |
| New Hampshire Electric Cooperative |
| New Energy Equity |
| NEW ENGLAND SOLAR GARDEN CORP |
| New York State Office of Renewable Energy Siting |
| Nexamp Inc. |
| Nine Fasteners Inc. |
| NJ Solar |
| Northeast Clean Energy Council |
| NorthEast Electrical |
| Northeast Solar Services Inc DBA RevoluSun |
| NRGTree |
| NV5 |
| NY State Solar |
| NYSERDA |
| Olivewood Energy LLC |
| OMCO Solar |
| OMG Roofing Products |
| Omnidian |
| OnSite Solar LLC |
| Origis Energy |
| Ort Tool and Die |
| Outback Power an EnerSys company |
| Ozone Renewables |
| PanelClaw Inc. |
| Paradise Energy Solutions |
| Partner Engineering and Science Inc. |
| PEC |
| Pegasus Solar |
| Pepco Holdings Exelon |
| PESCO |
| Philadelphia CVB |
| Phoenix Business Solutions |
| Pike Renewables |
| Pike Telecom & Renewables |
| Pope Energy |
| Porter Electrical Contracting |
| PPL Safari Energy |
| Princeton University |
| Pro Star Energy |
| PSE&G |
| PSMJ |
| QE Solar |
| Quest Renewables |
| QuickBOLT |
| Racepoint Energy |
| Radiance Solar |
| Raptor Maps Inc. |
| Rath Young & Pignatelli |
| RBI Solar Inc |
| REC Americas LLC |
| Red Dot |
| Renewable American |
| Resonant Energy |
| Revision Energy |
| ReWild Renewables LLC |
| RLC Engineering PLLC |
| RM Clark & Associates |
| Roof Tech |
| RTO Insider |
| Russelectric A Siemens Business |
| S-5! |
| Safari Energy |
| SAVKAT INC. |
| Seaport Estates |
| Seminole Financial Services |
| Senior Manager Education Design |
| Seraphim Energy Group |
| SGC Power |
| Siemens |
| Skyward Insurance Company |
| SMA America LLC |
| Smart Electric Power Alliance |
| Smart Roofs Solar |
| SnapNrack |
| Solar By CIR |
| Solar Energy Industries Association |
| Solar FlexRack |
| Solar Foundations USA Inc. |
| SOLAR HOME ENERGY SOLUTIONS LLC |
| Solar on Earth |
| Solar Shepherd LLC |
| Solar Store of Greenfield |
| SolarBOS |
| SolarEdge Technologies |
| Solaria |
| SolarKal |
| SolBid Inc |
| Solect Energy Development LLC |
| Soleil Inc. |
| Soligent |
| Solis Inverters |
| Sol-REIT |
| Soltection |
| Standard Electric |
| Standard Solar |
| State of Maine/Governor's Energy Office |
| Studio Broekhoven LLC |
| Summer Hill Solar LLC |
| Summit Energy Group |
| Sunbug Solar |
| SunDensity Inc. |
| Sungage Financial |
| SunModo Corporation |
| Sunnova Energy Corporation |
| SunPower corporation |
| Sunrise Power Solutions |
| Sunrise Solar |
| Sunrun Inc. |
| Sunshine Solar LLC |
| Sunstruck Consulting |
| Sunwealth Power |
| SUNworks Inc. |
| Surety Bond Professionals Inc. |
| Sustainable Energy Advantage |
| Sustainable Energy Systems |
| SWCA Environmental Consultants |
| SWEB Development |
| Tangent Energy Solutions |
| Tectonic Engineering Consultants Geologists and Land Surveyors D.P.C. |
| Terracon |
| TerraSmart |
| Tetra Tech |
| The Okonite Company |
| The Solar Specialists |
| TitleVest |
| TJA Clean Energy LLC |
| Tomark-Worthen LLC |
| Town of Wellesley |
| TransCOR |
| TRC |
| Trina Solar Energy Co Ltd. |
| True Green Capital Management LLC |
| TrueLight Energy |
| Unirac Inc. |
| United Civil Inc. |
| USI Insurance Services |
| Vanguard Energy Partners LLC |
| Vikram Solar US Inc. |
| VSUN Solar |
| Wood Mackenzie |
| Woodfield Renewable Partners LLC |
| Yaskawa Solectria Solar |