The prime factors in location of aluminium smelting industries are as follows : (i) Assured source of raw material, bauxite, at minimum cost as it is a bulky material at 4 to 6 tonnes of bauxite are required to manufacture 1 tonne of aluminium. (ii) 18600 kwh of electricity is required per ton of ore for smelting of aluminium. Hence, regular supply of power is another important factor for location of the industry. Orissa produces about 45 per cent of the India's bauxite. Hence, aluminium smelting plants are located in Orissa. Also, the Hirakud dam provides cheap hydroelectricity for the development of the aluminium industry in the state. West Bengal, Kerala, Uttar Pradesh, Chhattisgarh, Maharashtra, and Tamil Nadu, are other states where aluminium smelting plants are located. INDAL, HINDALCO, MALCO, NALCO and Aluminium Corporation of India are names of the major smelting plants.