| 27061 | Switzerland | A bis Z Elektroanlagen | Gartenstrasse 11, 9204 Andwil | +41 71 3800155 | www.iwi.ch/abisz/start.php | | |
| 27062 | Switzerland | A. Kuster AG | Deucherstrasse 34, 8570 Weinfelden | +41 71 6333636 | www.a-kuster.ch | | |
| 27063 | Switzerland | A+B Flachdach AG | Sonnenweg 2, 4153 Reinach | +41 61 3817000 | www.abflachdach.ch | | |
| 27064 | Switzerland | Ackermann AG | Chännelmattstrasse 11, CH-3186 Düdingen | +41 26 4925588 | www.ackermannag.ch | | |
| 27065 | Switzerland | Ackermann Gebäudehüllen GmbH | Im Fennen 8, 8867 Niederurnen | +41 55 6101010 | https://www.ackermann-gebaeudehuellen.ch | | |
| 27066 | Switzerland | ADEV Energiegenossenschaft | Kasernenstrasse 63, Postfach 550, CH-4410, Liestal | +41 61 9272030 | www.adev.ch | | |
| 27067 | Switzerland | Aekip SA | Rue du Centre 140, 1025 Saint-Sulpice | +41 21 5345612 | https://www.aekip.ch | | |
| 27068 | Switzerland | Altenburger Elektro Service | Breitestr. 10, 8472 Seuzach | +41 52 2022959 | www.altenburger-elektro.ch | | |
| 27069 | Switzerland | Agena SA | Chemin du Grand-Pré 1C, 1510, Moudon | +41 21 9052656 | www.agena-energies.ch | BISOL Group, d.o.o., Worldwide Energy and Manufacturing USA Co., Ltd (Amerisolar), AU Optronics Corporation | ABB Italy S.p.A., Delta Energy Systems (Germany) GmbH, Kostal Solar Electric GmbH, SolarEdge Technologies, Ltd., Ginlong Technologies Co., Ltd |
| 27070 | Switzerland | Ainova AG | Postfach 51, Zelglimatte 3, CH-6260 Reiden | +41 62 7584633 | www.ainova.ch | | |
| 27071 | Switzerland | AIO-Solar GmbH | Grindel 3, CH-6017 Ruswil | +41 666 7800 | www.aio-solar.ch | | |
| 27072 | Switzerland | Akkon AG | Sandgrube 29, 9050 Appenzell | +41 71 7882360 | www.akkon-ag.ch | | |
| 27073 | Switzerland | Albasolar GmbH | Untere Zollgasse 41, 3072, Ostermundigen | +41 31 9325070 | albasolar.ch/ | | |
| 27074 | Switzerland | Albrecht & Bolzli nova AG | Witikonerstrasse 409, 8053, Zürich-Witikon | +41 44 3822211 | albo.ch | | |
| 27075 | Switzerland | Alectron AG | Wolhuserstrasse 31, 6017 Ruswil | +41 41 8847000 | alectron.ch | | |
| 27076 | Switzerland | Alenergy Invest AG | Industriestrasse 35, 8625 Gossau ZH | +41 44 9366555 | www.alenergy.ch | | |
| 27077 | Switzerland | Alenso AG | Dorfhaldenweg 2, 3612 Steffisburg | +41 33 4387090 | www.alenso.ch | | |
| 27078 | Switzerland | Alex Gemperle AG | Old St, Wolfgangstrasse 11, 6331 Hünenberg | +41 41 7250707 | www.gemperle.ch | | |
| 27079 | Switzerland | Allenbach Holzbau und Solartechnik AG | Hauptstrasse 220, 3714 Frutigen | +41 33 6722080 | www.solarholzbauer.ch | | |
| 27080 | Switzerland | Allsol GmbH | Sternenhofstrasse 11, 4153 Reinach | +41 61 3212323 | www.allsol.ch | SolarEdge Technologies, Ltd. | |
| 27081 | Switzerland | Alois Rickenbach AG | Landstrasse 31, 5073 Gipf-Oberfrick | +41 62 8656070 | www.rickenbach-elektro.ch | | |
| 27082 | Switzerland | Alpenstrom GmbH | Laimgasse 62, 6438, Ibach | +41 77 4608826 | alpenstrom.ch | | |
| 27083 | Switzerland | Alsol Ag Alternative Energiesysteme | Hungerbüelstrasse 22, 8500 Frauenfeld CH | +41 52 7230040 | www.alsol.ch | | |
| 27084 | Switzerland | Alsolis SA | Via Penate 4, 6850 Mendrisio | +41 91 6409080 | www.alsolis.ch | | |
| 27085 | Switzerland | Alsona AG | Schuelgass 16b, 6215 Beromünster | +41 41 5458520 | www.alsona.ch | | |
| 27086 | Switzerland | Alteno Solar AG | Murbacherstrasse 34, 4056, Basel | +41 61 3863253 | https://www.altenosolar.ch | | |
| 27087 | Switzerland | Altersol SA | Via al Fiume 4, CH-6930 Bedano | +41 91 6046192 | www.altersol.ch | | |
| 27088 | Switzerland | Amaudruz Énergies SA | Av. de l’Église-Anglaise 6, 1006 Lausanne | +41 21 6131304 | www.amaudruz-energies.ch | | |
| 27089 | Switzerland | AMAX Energie | Vy-Creuse 17, Case postale 549, 1196 Gland | +41 22 3643169 | www.amax-energie.ch | Victron Energy BV | OutBack Power, Victron Energy BV |
| 27090 | Switzerland | Ammann Solar AG | Neuensteigweg 16, 9424 Rheineck (SG) | +41 71 8500930 | www.ammann-solar-ag.ch | | |