Tata Group chairman Ratan Tata today called difficulties on land acquisition and coal block auctions as challenges impeding the growth of the power sector in the country. The main fuel (for meeting the increasing energy needs) will be coal...there is a question on coal and land auction which will be the concern and has to be addressed later, Tata said at Tata Power's annual general meeting here. The remarks come on the same day as the government tabling the CAG report on coal block auction, said the national exchequer lost up to Rs 1.86 lakh crore on parting with land, rather than auctioning it. [caption id=attachment_421640 align=alignleft width=380