The Tamil Nadu Transmission Corporation Limited (TANTRANSCO) (Tamil: தமிழ்நாடு மின் தொடரமைப்புக் கழகம் (வரையறுக்கப்பட்டது)) is an electric power transmission system operator owned by Government of Tamil Nadu.

It was established in November 2010, as a result of restructuring the Tamil Nadu Electricity Board.

The TANTRANSCO maintains all the substations in Tamil Nadu apart from the Power Grid Corporation of India Limited (PGCIL).

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