Powergrid Corporation of India Ltd.

Bharat Heavy Electricals Ltd.

Central Organization for Railway Electrification (CORE)

NTPC Gas Power Project Faridabad

Indian Railways

Indian Oil Corporation Ltd

Bharat Sanchar Nigam Ltd

Northern Railways

Engineers India Ltd.

Bridge & Roof Company India Ltd.

IRCON International Ltd.

Military Engineering Service

Gujarat Energy Transmission Corporation Ltd. (GETCO)

Chhattisgarh state power distribution company Ltd.

Punjab State Power Corporation Ltd.

Haryana Vidyut Prasaran Nigam Ltd.

Power Transmission Corporation of Uttarakhand Ltd. (PTCUL)

Jammu & Kashmir Power Transmission Corporation Ltd.(JKPTCL)

Punjab State Transmission Corporation Ltd.

Rajasthan Rajya Vidyut Prasaran Nigam Ltd.

Power Development Department, Jammu & Kashmir

Himachal Pradesh State Electricity Board

Uttaranchal Power Transmission Corporation of Uttarakhand

Jaipur Vidyut Vitran Nigam Limited

UP Power Transmission Corporation Limited

TBEA Energy India pvt ltd.

Ashoka Buildcon Ltd.

R.S. Infra Projects Pvt. Ltd.

Kalpataru Power Transmission Limited

Hitachi Energy India Limited

Larsen & Toubro Ltd.

Tata Project Ltd.

Toyo Engineering India Ltd.

Paharpur Cooling Towers Ltd.

Asea Brown Boveri (ABB) Ltd.

Blue Star Ltd.

Apar Industries Ltd.

Siemens Ltd.

Alstom Systems Industries Pvt. Ltd.

K RamaChandra Rao Transmission & Project Pvt. Ltd.

Shyam Indus Power Solution Pvt. Ltd.