| Kundenname | Stadt | Land |
|---|---|---|
| Energy Automation Systems GmbH | Wien | Austria |
| Energy Industries Engineering & Design | Tehran | |
| Enerkem Inc. | Montreal | Canada |
| ENERTRAG HyTec GmbH | Dauerthal | Germany |
| Engel Software Engineering | Hanau | Germany |
| Engineered Software, Inc. | Lacey | United States |
| Engineering Technical Services S.p.A. | Cameri | Italy |
| Engineers India Limited | Gurugram | India |
| Engineers India Limited | New Delhi | India |
| ENI S.p.A. | San Donato Milanese | Italy |
| EniProgetti SpA | Basingstoke | United Kingdom |
| Enovas | Darmstadt | Germany |
| Enppi Engineering for the Petroleum & Process Industries | Cairo | Egypt |
| ENPRODE Engineering & Consulting | Yenibosna-Istanbul | Turkey |
| ENTRACON Planungsgesellschaft mbH | Hamm | Germany |
| EPC Engenharia Projeto Consultoria S/A | Estoril Belo Horizonte | Brazil |
| EPC Handelsgesellschaft m.b.H | Wiener Neudorf | Austria |
| EPICON IEaC GmbH | Bad Vöslau | Austria |
| EQUANS | Zwijndrecht | Belgium |
| Equans SA | Zwijndrecht | Belgium |
| Equistar Chemicals, LP | La Porte | United States |
| Erdgas Verkaufs GmbH | Münster | Germany |
| ESB Electricity Supply Board | Dublin 2 | Ireland |
| Esco GmbH & Co KG | Rheinberg | Germany |
| ESFEROMATIC S. A. | Quilmes | Argentina |