Acute shortage of power has made it necessary for power to be imported from outside the city, the uprated 220 kV line will relieve critical loading of the Kalwa-Salsette lines and enhance firm transmission capacity for bringing power from outside to Mumbai city.

The transmission network, especially 220 KV Kalwa-Salsette lines, is critically loaded most of the time due to reduction in embedded generation in Mumbai. To reduce the critical loading of these lines, Tata Power had put up a proposal to Maharashtra State Load Despatch Centre (SLDC) and State Transmission Utility (STU) for augmenting transmission capacity between Kalwa and Salsette.

The uprating project carried out in very difficult terrain (involving multiple road crossings, creek crossing, live 22 kV feeder crossings, Eastern Express Highway crossing and Central Railway crossing) was completed safely in a record benchmark time period of 28 days.