- Orissa State Electricity Board
- Bihar State Electricity Board
- Maharashtra State Electricity Board
- Punjab State Electricity Board
- Govt. of Manipur, Electricity Department
- M.P.Electricity Board, Jabalpur
- Rajasthan State Electricity Board
- West Bengal State Electricity Board
- Department of Atomic Energy
- Bhaba Atomic Research Centre
- Central Coalfields Ltd
- Mahanadi Coalfields Ltd
- Larsen & Toubro Ltd
- North Eastern Electric Power Corporation Ltd., Shillong
- Kirloskar Electricals Ltd
- Siemens Ltd
- Crompton Greaves Ltd
- Steel Authority of India Ltd
- Indian Metal & Ferro Alloys Ltd
- Tata Projects Ltd
- Tata Iron and Steel Company Ltd
- National Aluminium Company Ltd
- Vendanta Aluminium Limited
- Nilachal Ispat Nigam Limited
- Various Govt. Undertakings & Corporations