Areva, the French nuclear energy major, will acquire its compatriot Alstom's transmission and distribution (T&D) business in India for Rs 80.6 crore, and has also made an open offer for buying an additional 20% from Alstom's shareholders at Rs 75.03 per share.Areva T&D SA has agreed to buy the shares of Alstom from its promoter - Alstom Holdings SA - at a price of Rs 30.45 per equity share. Alstom Holdings has 66.35% or 2.64 crore shares of its Indian arm.If Areva buys out all the shares, the total amount would be 14.5 million euro (Rs 80.6 crore).Areva has also made an open offer to buy 20% stake, comprising about 79.77 lakh shares from shareholders of Alstom, at a price of rs 75.03 per share, according to HSBC, managers to the offer.The offer would open on May 30 and close on June 18.