US energy firm Constellation Energy has accepted a 4.5-billion-dollar (3.15-billion-euro) offer from French giant EDF for a 49.99 percent stake in its nuclear power business, the companies said Wednesday.

The decision was a blow for renowned US investment guru Warren Buffett, whose energy group MidAmerican had offered 4.7 billion dollars for the whole of the group.

A statement from the French firm said the deal would "enhance Constellation Energy's long-term stability and liquidity position" and extend "the EDF Group's nuclear expertise in the United States."

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