Dynegy Inc. agreed to buy $6.25 billion of power plants from Duke Energy Corp. and private- equity firm Energy Capital Partners, almost doubling its generating capacity less than a year after emerging from bankruptcy protection.

The sale includes $2.8 billion for 11 Duke natural gas, coal and oil power plants in Ohio, Pennsylvania and Illinois as well as its retail sales business, Houston-based Dynegy said in a statement today. In a separate transaction, Dynegy is spending $3.45 billion for Energy Capital plants in Massachusetts, Connecticut, Pennsylvania, Illinois and Ohio.

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