(FILES) General view of the Angra 1 (R)

(FILES) General view of the Angra 1 (R) and Angra 2 nuclear power plants in Angra dos Reis, 250 km south of Rio de Janeiro, Brazil May 30, 2005. A massive blackout plunged tens of millions in Brazil’s largest cities into darkness, sparking major disruptions, fears of crime and energy supply concerns on November 10, 2009. The outage originated in the Itaipu hydroelectric plant that straddles the border between Brazil and Paraguay and supplies much of the energy to the two nations, Energy Minister Edson Lobao told reporters. The exact cause was yet to be determined. AFP PHOTO/VANDERLEI ALMEIDA (Photo credit should read VANDERLEI ALMEIDA/AFP/Getty Images)