Mozambique has considerable energy resources: natural gas in deep waters, an estimated hydropower potential of 12,000 MW and vast coal reserves with the potential of generating up to 5,000 MW . The Cahora Bassa hydropower dam in Tete Central Province, with 2,075 MW electricity generation capacity, is one of the largest hydropower installations in Africa. The proposed controversial large scale Mpanda Nkuwa dam (with a potential power generation of 2,500 MW) would also increase the country's electricity generation. Most of Cahora Bassa’s electricity is exported to South Africa (and Zimbabwe). Shockingly, Mozambique buys back its own electricity from South Africas Eskom. Once Mozambique buys it back, a large part of this electricity is actually used up by the Mozal aluminum smelter that is owned by Australia-based BHP Billiton (47%), the Mitsubishi Corporation of Japan (25%), the Industrial Development Corporation of South Africa (24%) and the Government of Mozambique (4%). One episode of struggle against MOZAL took place in 2010. The environmentalist group, Justiça Ambiental (member of Friends of the Earth International) explained  that " Mozal is an aluminum smelter situated in the outskirts of Mozambique’s capital, Maputo, in a densely populated area. It is mostly owned by BHP Billiton, with other smaller shareholders such as Mitsubishi Corporation, International Finance Corporation (IFC) and the Government of Mozambique.