KOCHI: Are windmills eco-friendly? Of course, in plains, but not in High Ranges where they pose serious threat to the Earth. Attappadi hills are the telltale example. It is one of the two sites where windmills are being set up for power generation in the state. The other being Ramakkalmedu in Idukki district. Apart from these, 16 sites have also been identified for windmills in Kerala. The first phase of the Attappadi project will generate 4.8 MW power initially and it will be raised to 100 MW in the later stage. To set up such a huge windmill farm, over 500 acres of land is required. A Denmark firm which executes the project will invest Rs 1,500 crore. The power to be generated at the farm will be supplied to local industrial units and the KSEB.