Vistra Energy  (VST) - Get Report approached rival Dynegy  (DYN) with a takeover offer, sources told the Wall Street Journal, a potential marriage that could result in the combined company becoming one of the country's largest independent power producers. 

The talks are only preliminary, and could conclude without a deal being struck, sources said, but both Texas-based companies have an enterprise value of about $10 billion. 

Vistra shares were up 1.3% in morning trading Friday on the news, while Dynegy stock jumped more than 25% on Friday. 

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