Blackouts Darken Brazil's 2 Largest Cities

The Copacabana beach is seen during a blackout in Rio de Janeiro, Tuesday, Nov. 10, 2009. A massive...

The Copacabana beach is seen during a blackout in Rio de Janeiro, Tuesday, Nov. 10, 2009. A massive power failure threw Brazil's largest cities into darkness Tuesday night along with other parts of the country affecting millions of people. (AP Photo/Felipe Dana)

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A massive power failure blacked out Brazil's two largest cities and other parts of Latin America's biggest nation for more than two hours late Tuesday, leaving millions of people in the dark after a huge hydroelectric dam suddenly went offline. All of neighboring Paraguay also lost power, but for only about 20 minutes.

The huge Itaipu dam straddling the two nations' border stopped producing 17,000 megawatts of power, resulting in outages in Rio de Janeiro, Sao Paulo and at least several other big Brazilian cities, Brazilian Mines and Energy Minister Edison Lobao said. He said outages hit nine of the 27 states in a country of more than 190 million people.

The cause of the failure had not been determined, but Lobao said strong storms uprooted trees near the Itaipu dam just before it went offline and could be to blame. Rio was the hardest hit city, he said.

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At 12:37 a.m. Wednesday, the lights in Rio's Copacabana neighborhood flashed back to life, prompting cheers and thunderous car honking.

"It's sad to see such a beautiful city with such a precarious infrastructure," said Igor Fernandes, a shirtless 22-year-old law student peddling his bike down a dark Copacabana beach. "This shouldn't happen in a city that is going to host the Olympic Games."

Lobao said the hydro plant at the dam itself was working, but there were problems with the power lines that carry electricity across Brazil. Brazil uses almost all of the energy produced by the dam, and Paraguay consumes the rest.

In Paraguay, the national energy agency blamed the blackout on a short-circuit at an electrical station near Sao Paulo, saying that failure shut down the entire power grid supplied by Itaipu. All of Paraguay went dark for about 20 minutes, the country's leading newspaper, ABC Color, reported.

The company in charge of the dam, Itaipu Binacional, said the blackout did not start at the hyrdoelectric complex. It said the most likely cause was a failure at one or more points in the transmission system.