Transmission operations of Tata Power in Mumbai License is spread over the entire city of Mumbai, its suburbs and extended up to the hydro generating stations in Raigad district of Maharashtra. This utility with more than 1,125 CKT KM of transmission network in Mumbai License Area (comprising of 995 CKT KM of 220 kV/110 kV overhead lines and 130 CKT KM of 220 kV/110 kV underground cables) meet the ever growing power needs of Mumbai and in helping the city achieve and retain its premium status of the commercial capital of India. The entire transmission system is centrally controlled from PSCC through the state of the art unified SCADA system.

Tata Power Transmission which has grid availability above 99.5 % is one of the most reliable systems in the country and carries 60 to 70 per cent of the bulk power consumed by Mumbai city.

It is the key interlink between the generation and distribution of power and links the city transmission system with Maharashtra state grid. In addition, it links the thermal generation stations of Trombay, hydro generating stations in Raigad district with the network and Mumbai Distribution utilities like Tata Power Distribution, BEST, MSEDCL and Reliance Infra.

Tata Power Transmission in Mumbai is continuously upgrading and augmenting the Transmission system to cater to the increasing demand of Mumbai customers and has invested around 1500 Crores in last 3-4 years. There are ambitious plans of investing around 4000 Crores in the next 5 years and also upgrade the system to 400 kV and connecting it to CTU.