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The Maryland Senate approved a bill in 2009 that would have re-regulated utilities, only to have it fail in the House.

Gov. Martin O’Malley, a Democrat, has long been supportive of re-regulation but has in recent years called on the Public Service Commission instead of legislators to get it done.

Public Service Commission officials on Wednesday declined to comment.

The House Economic Matters Committee resisted the 2009 bill due in part to members’ concerns that it would not have an immediate effect on prices and that deregulation would become more successful as more residents became aware of their energy choices.

Reaching an agreement with Exelon to re-regulate could prove difficult, as the company was directly critical of the 2009 re-regulation proposal, which it argued would lead to cost overruns on new plants.