The stock tanked 18.67 per cent to Rs 270 on the BSE.
Sources in the group said it was exploring the opportunities in Indonesia for acquiring coal blocks as well.
The Army was deployed in Kolkata and its neighbouring districts on Saturday, hours after the West Bengal government sought its help for immediate restoration of essential infrastructure and services in the state.
Officials in the power department said industrial demand (which accounts for 40 per cent of the state's power consumption) didn't rise last year, contributing to surplus power.
Coal requirement for the plant would be met through Coal India.
The state needs great numbers of new-generation entrepreneurs.
Conservation of energy dominated Ghosh's thoughts ever since he completed his Masters in Energy Science and Technology from Jadavpur University early 2000.