| AREVA T & D LTD | Siliguri / Purnia |
| Assam Electricity Board | Assam |
| Techno Electric & Engg. Co. Ltd | W.B / Bihar |
| Shapoorji Pallonji & Co. Ltd | IISCO Burnpur |
| Enfield Solar Energy Ltd | Falta |
| Khaitan Winding Wire (P) Ltd | Junglepur |
| ABB Ltd | W.B / WBSEDCL |
| S.K Samanta & Co. (P) Ltd | JNV Kharagpur |
| Power Max (India) Pvt. Ltd | Bhutan |
| Electrical Manufacturing Co. Ltd | IISCO Burnpur |
| Reacon International (CPWD) | Andaman Nicobar |
| Bengal Shrishti Infrastructure Development Ltd | Asansol |
| Hythro Power Corporation Ltd | WBSEDCL |
| Balaji Paper & Newsprint Pvt. Ltd | Jhargram Plant |
| Adhunik Power & Natural Resources Ltd | Jamshedpur |
| Mani Group | Kolkata, W.B |
| Jalan Group of Industries | Junglepur / Bombay Road |
| Eastern Copper Manufacturing Co. Pvt Ltd | W.B |
| D.R Steel Pvt. Ltd | Fort William, W.B |
| Diamond Heritage Enterprises | Dalhousie – Heritage, W.B |
| Amit Iron Pvt Ltd | Amta Road, W.B |
| EMC Ltd | Durgapur, W.B |
| Sterling & Wilson Ltd | Durgapur, W.B |
