Dynegy has reached an agreement to sell its Illinois Power utility in a deal that would reduce its debt and strengthen its balance sheet. Houston-based Dynegy was expected this morning to announce a deal, valued at about $2.2 billion, to sell Illinois Power to Exelon Corp., Bruce Williamson, Dynegy's president and chief executive officer, told the Houston Chronicle on Sunday. As part of the deal, Exelon would assume about $1.8 billion in Illinois Power debt, he said, adding: "That's a big chunk of debt to go away." Dynegy has been working to reduce its debt. With a sale, Dynegy's work...