The move brings the number of days allotted for evidentiary hearings to 11. The hearings are to begin Oct. 31.
With 45 witnesses expected to testify, the Maryland Public Service Commission on Tuesday told the parties in the case to add Nov. 11 and 18 to their calendar.
The commission also has set aside Nov. 21 and part of Nov. 22 if more time is needed, PSC spokeswoman Regina Davis said.
Constellation Chief Executive Officer Mayo Shattuck and Exelon President and Chief Operating Officer Christopher Crane are expected to testify on the first day of the hearings.