The deal, one of the biggest in the Indian power sector, was announced in August.
Clearing the transaction, Competition Commission of India said it is not "likely to have appreciable adverse effect on competition" in the country.
"... Post combination the combined market share of the acquirer, both in terms of installed capacity and electricity generation, would not be significant enough to raise any competition concern," CCI said in its order, dated October 24, and released today.
Under the proposed transaction, Adani Power would acquire Udupi Power Corp Ltd (UPCL) from Lanco Infratech, Lanco Thermal Power Ltd, Portia Properties Pvt Ltd and certain individual shareholders.
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UPCL operates the 1,200 MW power plant in Udupi, Karnataka.
"The proposed combination relates to the business of power generation in India. The power generation market in India is characterised by presence of a large number of players," the order said.
Making the announcement in August, Lanco Infratech had said the deal was "is valued at more than Rs 6,000 crore". It includes Rs 4,000 crore debt component.