Potomac Electric Power Company (Pepco) on Sept. 30 requested that the Maryland Public Service Commission (PSC) waive the requirement for the company to obtain a certificate of public convenience and necessity (CPCN) for the reconstructoring of an existing 230-kV overhead transmission line between its Burches Hill substation and a new Mattawoman substation in Prince George’s County, Md.
That is necessary to interconnect a third party’s planned new generation facility – which is designated as the Mattawoman Combined Cycle Facility and will be located adjacent to Cherry Tree Crossing Road – to the electric transmission system, the company said.
PJM Interconnection has directed Pepco to provide an interconnection between the third party’s planned new facility, which will be located adjacent to existing Pepco right of way (ROW) containing four existing 230-kV overhead transmission lines, the company said.
To accommodate the interconnection, Pepco said that it must reconductor one existing overhead 230-kV circuit that is about 2.7 miles long and is connected between the Burches Hill substation and the new Mattawoman substation. The circuit Is located on a double circuit lattice tower line within an existing Pepco transmission ROW containing two double circuit lattice towers, Pepco said.
In addition, the company noted that it would install two new riser structures and two new disconnect structures outside the Burches Hill and Mattawoman substations in order to support the transition of the circuit from overhead to underground.
Pepco said that in order to reconductor the overhead circuit, it would not need to obtain any new real property or additional ROWs through eminent domain. Furthermore, all work would take place within the existing Pepco ROW and the company would not replace any of the existing transmission tower structures. The company added that the new riser and disconnect structures would not be larger or higher than the existing structures, nor would they accommodate a larger conductor or a conductor of increased voltage.
As a result, the company said, the reconductoring project meets the criteria for a waiver of the CPCN requirements.
Pepco is an Exelon (NYSE:EXC) company.