BALTIMORE (AP) — Maryland regulators have added two days to their review of the proposed sale of Constellation Energy to Exelon Corp.

The Maryland Public Service Commission says 11 days are now scheduled for the hearings, which begin Monday. Forty-five witnesses are scheduled to testify. Constellation CEO Mayo Shattuck and Exelon President and Chief Operating Officer Christopher Crane are expected to testify on Monday.

Regulators and the two companies have been sparring since the deal was announced earlier this year. Crane said in testimony filed earlier this month that some conditions the state was trying to impose are unrealistic.

Gov. Martin O’Malley’s administration, meanwhile, asked regulators to reject the deal unless changes are made, saying it poses risks for customers of Baltimore Gas and Electric, a subsidiary of Constellation Energy Group Inc.

(Copyright 2011 by The Associated Press. All Rights Reserved.)