Oil And Natural Gas Corporation Limited, Ankleshwar, Gujarat invites tenders notice for revamping of complete HVA system I. E subostation, switch yard, CCPP, control room phase-I and II of CPF Gandhar. Tender document can be collected/downloaded from http://www.tenders. Ongc. Co. In . All the details related to this tender document are collected from the office of the Oil And Natural Gas Corporation Limited during office hours.