Together with the Brazilian government, he oversaw the building of the Itaipu dam on the Parana River.

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In Brazil, Anadarko has assets in the Campos Basin, where Wahoo and Itaipu are its biggest discoveries.

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Last month it similarly agreed to pay Paraguay more for electricity from Itaipu, the hydroelectric dam they share.

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The two countries share the Itaipu hydroelectric dam (still the world's largest until China's Three Gorges is completed).

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Itaipu is believed to contain up to 300 million barrels of oil.

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Energy Minister Edson Lobao said the bad weather cut the transmission lines in Sao Paulo state, leading the huge Itaipu dam to shut down automatically.

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Brazil is Paraguay's biggest trading partner, and its purchase of electricity from Itaipu, the vast hydroelectric dam the two countries share, represents Paraguay's second-biggest export.

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Work on one new dam at Xiluodu on the upper Yangtze, which will rival Itaipu's power capacity, resumed last year after being halted for a few months for an environmental assessment.

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Belo Monte will have the installed capacity to produce 11, 200 megawatts of electricity, while Itaipu has capacity to produce around 14, 000 megawatts and Three Gorges is around 22, 000 megawatts at full capacity.

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