| 35011 | United States | NY State Solar | 3125 Veterans Memorial Hwy., Suite G, Ronkonkoma, NY 11779 | +1 516 4182131 | https://nystatesolar.com | | |
| 35012 | United States | Nye Electric | 15611 Product Ln. B-11, Huntington Beach, CA 92647 | +1 714 9164445 | www.nyeelectric.com | | |
| 35013 | United States | Nyreer, LLC | 2 Progress Drive #4891, Clifton Park, NY 12065 | +1 518 6331300 | https://www.nyreer.com | SolarWorld Industries GmbH | SMA Solar Technology AG |
| 35014 | United States | New York State Solar Farm | 1938 Route 44 55, Modena NY, 12548 | +1 845 2550610 | https://nyssf.com | | |
| 35015 | United States | O Solar Mio | 4974 N. Fresno St., PMB 217, Fresno, CA 93726 | +1 662 7652748 | osolarmio.org | | |
| 35016 | United States | O'Brien Heating & Air Conditioning | 381 Burmont Road, Drexel Hill, Pennsylvania 19026-3522 | +1 610 2577035 | https://www.ocomfort.com | | |
| 35017 | United States | O'Connell & Lawrence, Inc. | 17904 Georgia Avenue, Suite 302 Olney, Maryland 20832 | +1 301 9244570 | www.oclinc.com | | |
| 35018 | United States | O'Connor Electric, Inc. | 15004 Hemmingsen Rd., Huntley, IL 60142 | +1 815 9234050 | www.ocelectric.net | | |
| 35019 | United States | O'Donnell Roofing Co. | 311 Lenox Rd, Havertown, PA, 19083 | +1 610 4498188 | odonnellroofingco.com | | |
| 35020 | United States | O'Meara Solar | PO Box 151, West Topsham, VT 05086 | +1 802 5222381 | www.omearasolar.com | SMA Solar Technology AG, Schneider Electric SA | |
| 35021 | United States | O'Neal, Inc. | 10 Falcon Crest Dr 29607, SC | +1 864 2982000 | www.onealinc.com | | |
| 35022 | United States | O'Reilly Electric, LLC | 584 Surf Ave, Stratford, CT 06615 | +1 475 6193327 | oreillyelectricllc.com | | |
| 35023 | United States | O’Bryant Electric Inc | 9314, Eton Avenue, Chatsworth, CA, 91311 | +1 818 4071986 | www.obryantelectric.com | | |
| 35024 | United States | O&E Matias Electrical Service, LLC | 99-899 Iwaena St., Bay 115, Aiea, HI 96701 | +1 808 4851649 | oematias.com | | |
| 35025 | United States | O&M Construction Services LLC | 12847 Capricorn Street, Stafford, TX 77477 | +1 713 2347518 | www.omconstructionhtx.com | | |
| 35026 | United States | O&M Solar Services, LLC | 800, Wilshire Blvd., #200, Los Angeles, CA, 90017 | +1 833 4667657 | https://www.omsolarservices.com | | |
| 35027 | United States | O3 Energy | 325 North St. Paul Street #4550, Dallas, TX 75201 | +1 888 9992902 | o3energy.com | Fronius International GmbH | |
| 35028 | United States | Oak Electric Service | 5492 Dixie Hwy., Waterford, MI 48329 | +1 800 9647070 | www.oakelectric.com | | |
| 35029 | United States | Oak Leaf Energy Partners | 2645 E. 2nd Avenue, Suite 206, Denver, CO 80206 | +1 303 3331339 | oakleafep.com | | |
| 35030 | United States | Oasis Water and Solar | 135 W Shaw Suite #106, Fresno, CA, 93704 | +1 559 7056573 | oasiswaterandsolar.com/ | | |
| 35031 | United States | Oasis Air and Solar | 1000 E Truxtun Ave, Bakersfield, CA 93305 | +1 661 3222665 | https://oasisairandsolar.com | | |
| 35032 | United States | Oasis Montana Inc. | 436 Red Fox Lane Stevensville, MT 59870 | +1 406 7774321 | www.oasismontana.com | Hanwha Q CELLS GmbH, Canadian Solar Inc., Panasonic Corporation (Sanyo), AXITEC Energy GmbH & Co. KG, Jinko Solar Holding Co., Ltd., Solaria Corporation | OutBack Power, Xantrex Technology Inc, Yaskawa - Solectria Solar, SMA Solar Technology AG, Enphase Energy, Inc. |
| 35033 | United States | Oasis Trade Inc | 7959 Silverton Ave.. #1020, San Diego, CA 92126 | +1 858 2714440 | https://www.oasistradetint.com | | |
| 35034 | United States | Oberlander Electric | 2101 N Main Street, East Peoria, IL 61611 | +1 309 6941468 | https://www.oberlanderelectric.com | | |
| 35035 | United States | Oberon Initiatives Inc. | 86 Finnell Dr., Unit 13-14, Weymouth, MA 02188 | | www.oberoninitiatives.com | | |
| 35036 | United States | OBOT Electric | 2020, 124th Ave NE Suite C-105, Bellevue, WA, 98005 | +1 425 7029999 | obotelectric.com | | |
| 35037 | United States | OC Property Services, LLC | South Coast Metro Area, Southern California, 92707 | +1 714 3491200 | orangecountypropertyservices.com | | |
| 35038 | United States | OC Solar Panels | 8 Paseo Verde, San Clemente, CA 92673 | +1 949 9397507 | ocsolarpanels.com | | |
| 35039 | United States | OC Solar Panels Installation | 1000 Quail St., Ste 130 Newport Beach, CA 92660 | +1 714 9880149 | www.bestocsolarpanels.com | | |
| 35040 | United States | Occidental Power | 5982 Mission St. San Francisco, CA 94112 | +1 415 6818861 | www.oxypower.com | SMA Solar Technology AG, SolarEdge Technologies, Ltd. | |