PARIS — Electricite de France SA said Wednesday it will challenge famed investor Warren Buffett's planned takeover of U.S. wholesale power generator Constellation Energy Group Inc. by offering $4.5 billion for half of the company's nuclear power business.
France's state-controlled power company, which backed down from a full takeover bid for Constellation in October, said it had offered to take a 50-percent stake in Constellation's nuclear operations through a joint venture.
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