Power Grid Corporation of India Limited has been declared as the successful bidder under Tariff Based Competitive Bidding to establish 'Eastern Region Strengthening Scheme —XXI (ERSS-XXI)' on Build, Own Operate and Maintain (BOOM) basis.

The Letter of Intent (Lol) has been received on 17th October 2017. The Transmission system traverses in the state of Bihar and includes establishment  of three new 400kV Substations and associated 400kV transmission lines.