On November 10, 2009, transmission from the plant was completely disrupted, possibly due to a storm damaging up to three high-voltage transmission lines. Itaipu itself was not damaged. This caused massive power outages in Brazil and Paraguay, blacking out the entire country of Paraguay for 15 minutes, and plunging Rio de Janeiro and São Paulo into darkness for more than 2 hours. 50 million people were reportedly affected. The blackout occurred at 22:13 local time. It affected the southeast of Brazil most severely, leaving São Paulo, Rio de Janeiro and Espírito Santo completely without electricity. Blackouts also swept through the interior of Rio Grande do Sul, Santa Catarina, Mato Grosso do Sul, Mato Grosso, the interior of Bahia and parts of Pernambuco, energy officials said. By 00:30 power had been restored to most areas.
On November 10 2009 transmission from the plant was completely disrupted possibly due to a storm damaging up to three high-voltage transmission lines Itaipu itself was not damaged This caused massive power outages in Brazil and Paraguay blacking out the entire country of Paraguay for 15 minutes and plunging Rio de Janeiro and São Paulo into darkness for more than 2 hours 50 million people were reportedly affected The blackout occurred at 2213 local time It affected the southeast of Brazil most severely leaving São Paulo Rio de Janeiro and Espírito Santo completely without electricity Blackouts also swept through the interior of Rio Grande do Sul Santa Catarina Mato Grosso do Sul Mato Grosso the interior of Bahia and parts of Pernambuco energy officials said By 0030 power had been restored to most areas