Based on an agreement, signed in 1975, Japan had to sell its stake in Inalum to the Indonesian government by October 2013.

In 1975, the partnership between Indonesia and Japan started. Nippon Asahan, a consortium of 12 Japanese firms, and the Indonesian government planned to build hydroelectric plants with an aluminium smelter. Inalum is currently Southeast Asia's largest aluminimum smelter with an annual aluminium production capacity of 225,000 tons, of which 60 percent is exported to Japan, while the remaining 40 percent is used for Indonesia's domestic market.

The government of Indonesia allocated IDR 2 trillion from the 2012 State Budget and IDR 5 trillion from the 2013 State Budget to finance the take-over. It aims to boost Inalum's aluminium production to 470 tons per year by 2017.

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