The two large dams under construction on the Madeira River, Jirau and San Antonio, which together will provide nearly 7,000 MW of electricity, continue Brazil's reliance on hydropower. Mega-dams—such as the 14,000-MW Itaipu, which began during the 1970s under the military dictatorship—have helped move Brazil to No. 2 behind China on the world's hydro list. Dams generate between 80% and 90% of the country's electricity.