- Ahmedabad Electricity Co. Ltd.,
- Alstom Power Companu Ltd., Durgapur
- Andhra Pradesh Power Generation Corporation Limited
- Asean Brown Boveri Ltd.,New Delhi
- Assam Electricity Board., Bongaigoan
- Bonagaigoan Refinereies and Petrochemicals Ltd.,
- Bharat Heavy Plates and Vessels Ltd., Vizag.
- Bharat Petroleum Corporation Ltd., Mumbai
- Bihar State Electricity Board., Muzzaffarpur
- Bhilai Steel Plant.
- Calcutta Electricity Company Ltd., Calcutta.
- Chatishgarh State Electricity Board., Korba West
- Cochin Refineries Ltd.,
- Durgapur Projects Ltd.
- Damodar Valley Corporation Ltd., Mejia.
- Fertilizers Corporation of India Ltd., Ramagundam
- Gujarat Electricity Board, Ukai, Gandhinagar, Sikka, Wani, Baroda.
- Gujarat Narmada Valley Fertilizers and Corporation Ltd., Baruch.
- Grasim Industries Ltd., Nagda.
- Hindustan News Prints Ltd., Kottyam.
- Hindustan Petrochemicals Ltd., Vizag.
- Haryana State Electricity Board., Panipat.
- Hindalco Industries Ltd., (Renusagar Power)
- Indian Rayons India Ltd., Veraval.
- India Farmers and Fertilizers Cooperative Ltd., Phulpur, Kalol.
- Indian Oil Corporation Ltd., Baroda, Mathura, Haldia.
- Indian Petrochemical Ltd., Nagathone.
- Jindal Steel Limited
- Mangalore Chemicals and Fertilizers Ltd.,
- Mangalore Refinereis and Petrochemicals Ltd.,
- Madras Fertilizers Ltd. Chennai.
- Madhya Pradesh State Electricity Board., Satpura, Korba East.
- Maharashtra State Electricity Board., Koradi, Parali, Chadrapur
- National Aluminium Company Ltd., Angul, Damanjodhi.
- National Fertilizers Ltd., Panipat, Bathinda
- Neyveli Lignite Corporation Ltd., Neyveli.
- National Thermal Power Corporation Ltd.
- NTPC Alstom Power Services Private Limited
- NTPC Sail Power Company Limited
- Oil and Natural Gas Corporation
- Orissa State Electricity Board., Talcher
- Punjab State Electricity Board. Bathinda Punjab State Electricity Board Bhatinda
- Paradeep Posphates Ltd., Paradeep
- Rashtriya Chemicals and Fertilizers Ltd., Mumbai.
- Reliance Power .
- Tata Electric Company Ltd., Mumbai.
- Tamil Nadu Electricity Board. Tuticorin, Ennore, North Madras, Mattur
- Thermax Babcock and Willcox Ltd., Pune
- Torrent Power Limited
- Uttar Pradesh State Electricity Board., Anpara, Obra.
- Vizag Steel Plant. Vizag
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