Exelon Corp. said Tuesday that it has promoted the head of its Baltimore-based Constellation arm and named a new chief executive for the local operation.

Kenneth W. Cornew, who had been Constellation's chief executive, is now CEO of Exelon Generation in Kennett Square, Pa. Exelon said Joseph Nigro, Constellation's former senior vice president of portfolio management and strategy, has stepped into the CEO job at the Baltimore business unit.

Before working at Constellation, Nigro was a senior vice president for Exelon Power Team.

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