The stake sales could fetch Rs 6,600 crore to the exchequer.
CLP entered India in 2002 with the acquisition of a gas fired power plant in Gujarat.
Two separate deals for the same assets came unstuck last year.
It is backed by Bessemer and Olympus.
Bharat Light & Power had acquired a part of DLF's wind power assets two years ago.
Bulk of the money went to selling shareholders.
It had invested in Kalpataru Power in 2006.
Ind-Barath Energy's parent counts several PE firms as investors.
It also owns Spencer's Retail, which achieved break-end in May.
For 3i, this is the second liquidity activity this year in India.