US law firms are investigating alleged multibillion dollar bribery at three Brazilian hydroelectric power projects and a nuclear power plant.

The investigation has now been expanded to nine projects, sources have told Reuters, as the country reels from an overarching scandal that threatens to bring down the government.

The corruption investigation could now see Brazilian state-run power company Eletrobras be delisted from the New York Stock Exchange.
Eletrobras sign
Eletrobras said delivery of its 20-F form, required of foreign issuers listed in the United States, had been delayed by  an internal investigation that is analyzing potential financial losses from a graft scheme involving local construction firms.

Brazilian federal prosecutors say construction firms that bribed politicians and executives at state-run oil firm Petroleo Brasileiro SA in return for bloated contracts likely repeated the scheme at Eletrobras.

Prosecutors have already charged Othon Luiz Pinheiro da Silva, the former chief executive of Eletrobras subsidiary Eletronuclear, with corruption and money laundering. He is accused of taking $1.3m in bribes related to the Angra 3 plant near Rio de Janeiro.

The investigation has jailed dozens of engineering executives and fueled the campaign to impeach President Dilma Rousseff. She is expected to be suspended after a Senate vote later on Wednesday for allegedly manipulating public accounts. She denies any wrongdoing.

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