NESL boasts of a wide and ever growing clientele of big players which include:

- Reliance Industries Limited
- Indian Oil Corporation Limited
- National Thermal Power Corporation
- Essar Oil / Essar Steel
- Oil India Limited
- Steel Authority of India Limited
- Tata Steel Limited
- Adani Group
- JSW Steel Limited
- Oil and Natural Gas Corporation Limited
- Indian Navy
- Jindal Steel And Power Limited
- Hindusthan Petroleum Corporation Limited
