N.P.C.I.L
NTPC LIMITED.
W.B.P.D.C.L
W.B.S.E.T.C.L
ANDHRA PRADESH POWER GENERATION CORPORATION LIMITED.
TELANGANA STATE POWER GENERATION CORPORATION LIMITED.
TAMILNADU ELECTRICITY BOARD
DAMODAR VALLY CORPORATION
PGCIL
MECON
GRIDCO
ISGEC
NTPC ALSTOM LIMITED.
LARSEN & TOUBRO LIMITED.
NTPC (LODGE COTTRELL INDIA PVT. LTD.)
TATA PROJECT LIMITED.
SIMENS LIMITED.
ABB INDIA LIMITED.
JINDAL STEEL & POWER LIMITED.
MEGHA ENGINEERING & INFRASTRUCTURE LIMITED.
ATMASCO
SUBTEL
BGR ENERGY SYSTEMS LIMITED.
BIECCO LAWRIE LIMITED.
THYSSENKRUPP INDUSTRIES
DRIPLEX WATER ENGINEERING LIMITED.
DEEJAY SYSTEM CONSULTANTS PVT.LTD.
ENMAS GB POWER SYSTEMS PROJECTS LIMITED.
STERLING & WILSON LIMITED.
ALSTOM T & D
I.T.C LIMITED.
JIFT WATER INFRASTRUCTURE LIMITED.
KIRLOSKER BROTHERS LIMITED.
TESLA TRANSFORMERS LIMITED.
HINDUSTAN NEWSPRINT LIMITED.
MACO CORPORATION (INDIA) PVT.LTD.
McNALLY BHARAT ENGINEERING COMPANY LIMITED.