| Client name | City | Country |
|---|---|---|
| RUHR OEL GmbH | Gelsenkirchen | Germany |
| Ruhrkohle Bergbau AG | Dortmund | Germany |
| Ruhrkohle Bergbau AG | Gelsenkirchen | Germany |
| Ruhrkohle Niederrhein | Dortmund | Germany |
| Ruhrkohle Niederrhein AG | Duisburg | Germany |
| RusVinyl | Kstovo | Russian Federation |
| Rütgers Chemicals GmbH | Castrop-Rauxel | Germany |
| RWE Generation SE | Lingen | Germany |
| RWE Group Business Services GmbH | Köln | Germany |
| RWE Group Business Services GmbH | Dortmund | Germany |
| RWE IT GmbH | Essen | Germany |
| RWE Power | Bergheim | Germany |
| RWE Power AG | Köln | Germany |
| RWE Power AG | Grevenbroich-Neurath | Germany |
| RWE Power AG | Frechen | Germany |
| RWE Power AG | Hürth | Germany |
| RWE Service GmbH | Trier | Germany |
| RWE Technology GmbH | Essen | Germany |
| RWE-DEA Aktiengesellschaft | Brunsbüttel | Germany |
| S.C. ICA SYSTEM S.R.L. | Selimbar/Sibiu | Romania |
| S.C. OMV Petrom S.A. | Ploiesti | Romania |
| S.D.E. B.U.B.A | Schoten | Belgium |
| S.K.I. Schlegel & Kremer Industrieautomation GmbH | Mönchengladbach | Germany |
| Saarstahl AG | Völklingen | Germany |
| SABIC Europe | Urmond | Netherlands |
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