supply, erection, testing and commissioning of (i) 2nd circuit stringing (23.614km) on existing 132kv dc/sc towers from 220/132 kv ss atmakuru to 132/33kv ss vinjamuru (ii) 1 no. 132kv bay extension at 220/132 kv ss atmakuru and (iii) 1no.132kv bay extension at 132/33kv ss vinjamuru in spsr nellore district on turnkey basis