| Client name | City | Country |
|---|---|---|
| Städtische Werke Energie+Wärme GmbH | Kassel | Germany |
| Stahlwerk Thüringen GmbH | Unterwellenborn | Germany |
| Standardkessel Baumgarte GmbH | Bielefeld | Germany |
| Standardkessel Baumgarte GmbH | Mülheim an der Ruhr | Germany |
| STEAG GmbH | Duisburg | Germany |
| Steinmüller Babcock Environment GmbH | Gummersbach | Germany |
| Steinmüller Rompf GmbH & Co | Gummersbach | Germany |
| Stickstoff Werke AG | Lutherstadt Wittenberg | Germany |
| STOLCO | Düsseldorf | Germany |
| Süd-Chemie AG | Moosburg | Germany |
| Sunvic Regler GmbH | Solingen | Germany |
| SUSTEC Schwarze Pumpe GmbH | Spreetal/Spreewitz | Germany |
| Symrise GmbH & Co. KG | Holzminden | Germany |
| Synthomer Deutschland GmbH | Marl | Germany |
| Syspac Digtal Media Sevices GmbH & CoKG | Marburg | Germany |
| Taminco Germany GmbH | Leuna | Germany |
| TEC artec GmbH | Oranienburg | Germany |
| Technische Fachhochschule Wildau | Wildau | Germany |
| Technische Universität Hamburg-Harburg | Hamburg | Germany |
| Tectrion GmbH | Dormagen | Germany |
| Tectrion GmbH | Leverkusen | Germany |
| TEHA Engineering GmbH | Haltern am See | Germany |
| TGE Gas Engineering GmbH | Bonn | Germany |
| TGE Marine Gas Engineering GmbH | Bonn | Germany |
| Theisen GmbH & Co. KG | Ochtrup | Germany |