| Name | Type | Country |
|---|---|---|
| Sacyr-Vallehermoso | Enterprise | Spain |
| SAITEC S.A. | Enterprise | Spain |
| Sarein | Enterprise | Spain |
| Sensing & control systems | Enterprise | Spain |
| Sensomor Aplicaciones Electronicas | Enterprise | Spain |
| Servinform | Enterprise | Spain |
| Siemens | Enterprise | Spain |
| Sintef Nord As | Enterprise | |
| Sistemas Urbanos de Energías Renovables, S.L. | Enterprise | Spain |
| Sistemes Avancats De Energia Solar Termica Sccl - Aiguasol | Enterprise |