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New substation proposed in Assam to strengthen NER-ER grid interconnection

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A new 400kV substation has been proposed in Bornagar, Assam, as part of the interstate transmission system (ISTS) network, to provide an alternative interconnection between the northeastern region (NER) and eastern region (ER) grids. This initiative aims to address the risk of supply disruptions, as the current gateway to the NER grid, the Bongaigaon substation, is located in a flood-prone area.

The Central Transmission Utility of India Ltd (CTUIL) has supported this proposal, initially recommended by the North Eastern Region Load Dispatch Centre (NERLDC) in 2020. The Bornagar substation will initially operate at 400kV but will have the capacity to be upgraded to 765kV and 220kV in the future.

The new substation will include a loop-in, loop-out (LILO) of the existing 400kV double-circuit (quad) Bongaigaon–Balipara line, and a new 400kV double-circuit (quad) Alipurduar–Bornagar line. This will involve shifting the 400kV double-circuit (quad) Alipurduar–Bongaigaon line to the new Bornagar substation, creating a 110 km extension.

Power Grid Corporation of India Ltd (PGCIL) owns the existing substations at Alipurduar, Balipara, and Bongaigaon. The proposed Bornagar substation and the line modifications will be part of the “North Eastern Region Expansion Scheme – XXV” (NERES-XXV), with an estimated cost of Rs 833.24 crore.

The National Committee on Transmission (NCT) will discuss this scheme in its next meeting and decide on the implementation mode, either through tariff-based competitive bidding (TBCB) or regulated tariff mechanism (RTM). As the project cost exceeds Rs 5 billion, approval from the Union power ministry will also be required.

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