| Ettevõtte nimi | Reg. kood |
|---|---|
| EN.SY OÜ | 17049967 |
| ENERGY SYSTEMS OÜ kustutatud | 12249199 |
| ENERCOM SYSTEMS OÜ kustutatud (endine nimi Fiksater OÜ) | 12404582 |
| ENGINET SYSTEMS OÜ | 10348968 |
| SW ENERGY SYSTEM OÜ | 17142394 |
| AM ENERGY SYSTEMS OÜ | 16751926 |
| ENEFFIC SYSTEM OÜ UÜ kustutatud | 12011150 |
| ENCENTRO SYSTEMS OÜ | 14861668 |
| LEGRAND ESTONIA OÜ (endine nimi Ensto Building Systems OÜ) | 11051696 |
| SYSTEM ENGINEERING OÜ kustutatud | 11033681 |
| ENERGOLINK SYSTEMS OÜ | 17224554 |
| ENGINEERING SYSTEM OÜ (endine nimi Ingeneering System Osaühing) | 12379080 |
| BALTIC ENERGY SYSTEM OÜ kustutatud (endine nimi AlphaNord Holding OÜ) | 11433707 |
| GREEN ENERGY SYSTEMS OÜ kustutatud | 11532094 |
| FREDE OÜ (endine nimi Danae Enterteinment OÜ) | 11144831 |
| ENVIRONMENTAL SYSTEM OÜ kustutatud (endine nimi osaühing ENVIKONS) | 10059684 |
| ENERGY SYSTEM COMPANY OÜ | 16516160 |
| BIOFORCE EBAVERE OÜ (endine nimi Eterna Systems OÜ) | 12007697 |
| REVAL PETERSBURG TRUST OÜ (endine nimi Smart Energy Systems OÜ) | 12534221 |
| SOLAR RADIANT EST OÜ (endine nimi Bluemark Systems OÜ) | 14793563 |
| EDS SYSTEMS OÜ (endine nimi OÜ Engler Trade) | 11384133 |
| EESTI KAPITAL OÜ (endine nimi Wind Energy Systems OÜ) | 11515821 |
| ELECTRICAL SYSTEMS OÜ (endine nimi Electrical Systems Engineering Ltd OÜ) | 14235586 |
| 2M ENGINEERING SYSTEMS OÜ kustutatud | 14181459 |
| ENHANCED FEEDBACK SYSTEMS OÜ | 16030478 |
| INTELLIGENT ENERGY SYSTEMS OÜ | 16577196 |
| SYMBIOTICDROID ENTERTAINMENT OÜ kustutatud | 14827157 |
| INDUSTRIAL SYSTEMS ENGINEERING OÜ | 14517416 |
| ENVIROLYTE DISINFECTION SYSTEMS OÜ kustutatud | 12559149 |
| OFF GRID ENERGY SYSTEM TECHNOLOGIES OÜ | 17425034 |
| SYNERGY ICAPITAL EUROPEAN ENTERPRISE OÜ | 16210024 |
| ENERGY SYSTEMS DEVELOPMENT CORPORATION OÜ kustutatud | 10986781 |