Banerjee was earlier working with Essar Group as Group President- International Finance.
"Prabal Banerjee has joined Bajaj Group as President (Finance & Strategy) to look after the power ventures of the group in addition to dealing with corporate strategies at group level," Bajaj group said in a statement.
Bajaj group has two power companies -- Bajaj Energy Pvt Ltd with a generation capacity of 450 MW and Lalitpur Power Generation Ltd, which will achieve 660 MW capacity next month out of total 1980 MW.
The group also has a sugar company Bajaj Hindusthan.