(RTTNews) - Constellation Energy Group (CEG) climbed in pre-market trading, on reports EDF has offered to acquire up to $6.5 billion of the company's assets in a new bid.

The stock was up $5.95 just before 8:20 am ET, advancing to $31.10. If pre-market gains hold, the stock will open at its highest level since mid-September.

Tuesday, after the closing bell, Electricit?? de France SA or EDF will offer to acquire as much as $6.5 billion of assets from the Baltimore-based wholesale power generator Constellation Energy Group reports Wall Street Journal.

Constellation Energy spurned an earlier offer from the French energy giant EDF and instead in September agreed to be bought by Warren Buffett's unit MidAmerican Energy Holdings Co. for $26.50 per share, plus the $1 billion investment. The transaction came after Constellation's shares slid amid liquidity concerns that had analysts worried that the company would go out of business.

As part of the deal EDF would inject $1 billion into Constellation immediately in exchange for preferred shares, effectively a down payment on its offer to take a 50% stake in Constellation's nuclear-power generating and operating business for $4.5 billion. EDF will also offer to buy up to $2 billion in non-nuclear-generation assets from Constellation.

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