| 15271 | Italy | SIEM Srl | Via Europa Snc, 08028 Orosei (NU) | +39 0784 997110 | www.siemorosei.it | | |
| 15272 | Italy | Siem S.r.l. Impianti Elettromeccanici | Via A.Grandi, 14, Z.Ind.le, Baraccola, 60131, Ancona, AN | +39 071 286021 | www.siem.it | | |
| 15273 | Italy | Siemec srl | Via delle Mimose SN, 70026 Modugno (BA) | +39 080 9260961 | https://www.siemecsrl.it | | |
| 15274 | Italy | Sienambiente | Via Simone Martini, 57, 53100 Siena | +39 577 248011 | www.sienambiente.it | | |
| 15275 | Italy | Siev Tecnologie Impiantistiche Srl | Viale Virgilio, 07030 Viddalba (SS) | +39 079 5809040 | www.sievimpianti.it | | |
| 15276 | Italy | Sigeim Energia Srl | Via Domenico Lupatelli, 28, 00149, Roma | +39 06 84241487 | www.sigeim.it | Hanwha Q CELLS GmbH, Panasonic Corporation (Sanyo), AU Optronics Corporation, LG Electronics, Inc., Ferrania Solis S.r.l., Waris S.r.l. | SMA Solar Technology AG, Fronius International GmbH, SolarEdge Technologies, Ltd., SolaX Power Network Technology(Zhejiang) Co.,Ltd. |
| 15277 | Italy | Silo S.r.l | Via Della Motorizzazione 50/B, 12100, Cuneo, CN | +39 0171 413314 | www.silofotovoltaico.com | | |
| 15278 | Italy | Siltronic SRL | Via I Maggio, Zona Industriale Pietra Rossa -Trevi, Perugia | +39 0742 381936 | www.siltronicsrl.it | | |
| 15279 | Italy | Sima Energie Rinnovabili Srl | Via Guglielmo Marconi, 19, 20080 Vermezzo MI | +39 02 87165626 | www.simaenergierinnovabili.it | | Trina Solar Limited, LG Electronics, Inc. |
| 15280 | Italy | Simatic Sas | Via C. A. dalla Chiesa, 9, 86042 Campomarino CB | +39 0875 538191 | www.simaticsas.it | | |
| 15281 | Italy | SIMCO srl | Via Emilia, 486, 15057 Tortona AL | +39 0131 861698 | https://www.simcosrl.com | | |
| 15282 | Italy | SIMEC S.r.l. | Belvedere, Ingresso 2, 53034 Colle di Val d'Elsa (SI) | +39 0577 905042 | simec-srl.it | | |
| 15283 | Italy | Sin.El.Co Impianti | Viale IV Novembre, 8/A, 48018 Faenza (RA) | +39 0544 580175 | www.sinelcoimpianti.it | Ningbo Sunways Technologies Co., Ltd, SMA Solar Technology AG, AROS Solar Technology (RPS SpA), Aurora Energie Srls | |
| 15284 | Italy | Sinectra S.r.l. | Via Villabella, 24/A, 37047, San Bonifacio, VR | +39 045 6108101 | www.sinectra.it | | |
| 15285 | Italy | SinEneRgy Srl | 21, Via Palmerio De Rosa, 70021 Acquaviva Delle Fonti (BA) | +39 080 2475292 | www.sinenergysrl.it | Fronius International GmbH | |
| 15286 | Italy | Sinergi Srl. | Centro direzionale E33 - Viale del Lavoro, 33 - 37036 San Martino Buonalbergo (Verona) | +39 045 8240005 | www.sinergi.eu | SunPower Corp. | |
| 15287 | Italy | Sinergia Project Srl | Via Achille Loria, 11, 84014, Nocera Inferiore, Salerno, Campania | +39 081 19328142 | www.sinergiaproject.com | Solar-Fabrik AG, Sharp Energy Solutions Europe, Sunrise Energy Co., Ltd., Saint-Gobain (Avancis GmbH & Co. KG), Solartech Energy Corporation | Satcon Technology Corp., Steca Elektronik GmbH, Mastervolt International BV, Fimer S.p.A. |
| 15288 | Italy | Sinergicha S.r.l. | Piazza Primo Levi, 9, 10125, Torino | +39 011 6505282 | www.sinergicha.net | Aleo Solar GmbH | SolarEdge Technologies, Ltd. |
| 15289 | Italy | Sinergy Solar | Viale Aldo Moro, 367, 07026 Olbia SS | +39 389 0511997 | https://sinergysolar.com | | |
| 15290 | Italy | Sintesi Engineering Ing. Neodo Enrico | Via Eridania 46 B/C, 45030 Occhiobello (Rovigo) | +39 328 9280350 | www.gcsbio.net | SMA Solar Technology AG, Fronius International GmbH, ABB Italy S.p.A., SolarEdge Technologies, Ltd. | |
| 15291 | Italy | SIPE Impianti s.a.s. | Via Gramsci, 7 Località Piano Rosa, 28060 Cureggio (NO) | +39 0322 839723 | www.sipeimpianti.com | | |
| 15292 | Italy | Siper Impianti | Via Padre Bolognini 73, 25065 Lumezzane (BS) | +39 030 5357795 | www.siper-impianti.it | | Panasonic Corporation (Sanyo) |
| 15293 | Italy | Siram Spa | Via Anna Maria Mozzoni, 12, 20152 Milan, Lombardia | +39 02 412981 | www.siram.it | | |
| 15294 | Italy | Sireco s.r.l. | Via Marina Verde 13-15, 17038 Coasco, Villanova d’Albenga (SV) | +39 0182 993432 | www.sireco.it | | |
| 15295 | Italy | Sirio Srl | Via Luciano Savio, 6, 33080 Roveredo in Piano, PN | +39 0434 924274 | sirioimpianti.net | | |
| 15296 | Italy | Sirio S.R.L. | Via dello Sport, 3, 54100 Massa (MS) | +39 0585 834513 | www.siriofotovoltaico.it | | |
| 15297 | Italy | Sistema di Costruzioni S.R.L. | Via N. Copernico, 3, 44012 Bondeno, FE | +39 0532 898596 | www.sistemacostruzioni.it | | |
| 15298 | Italy | Sistema Solare Srl | Largo Diomede, 16, 71043 Manfredonia | +39 884 514115 | www.sistemasolaresrl.it | SMA Solar Technology AG, Fronius International GmbH, KACO New Energy GmbH | |
| 15299 | Italy | Sistemi Elettrici s.r.l. | Via Pio La Torre, 99, 36043 Camisano Vicentino VI | +39 800 985172 | www.wenet.it | | |
| 15300 | Italy | Sistemi Fotovoltaici srl | Via Giordano Bruno, 144, 47521 Cesena (Fc) | +39 0547 380210 | www2.sistemifotovoltaici.com | Solartec S.A., Hanwha Q CELLS GmbH, SunPower Corp., Suntech Power Co., Ltd., Panasonic Corporation (Sanyo), Jinko Solar Holding Co., Ltd., LG Electronics, Inc., Schlaefer S.r.l. | SMA Solar Technology AG, Fronius International GmbH, ABB Italy S.p.A., SolarEdge Technologies, Ltd., SolaX Power Network Technology(Zhejiang) Co.,Ltd. |