Pepco seeks waiver to extend two existing 230-kV lines

Potomac Electric Power Company (Pepco) is seeking a waiver from Maryland state regulators in connection with its proposal to extend two existing 230-kV overhead transmission lines.

In its Jan. 21 letter to the state Public Service Commission (PSC), Pepco requested that the PSC waive the requirement for the company to obtain a certificate of public convenience and necessity (CPCN) for the addition of up to four turning steel pole structures to intercept and extend the two lines.

Pepco noted that a certain section of the Public Utility Companies Article of the Annotated Code of Maryland provides that, for construction related to an existing overhead transmission line designed to carry a voltage in excess of 69-kV, the PSC is to waive the requirement to obtain a CPCN if the PSC finds that the construction does not:

  • Require the electric company to obtain new real property or additional ROWs through eminent domain; or
  • Require larger or higher structures to accommodate increased voltage or larger conductors.

In order to install the pole structures and extend the overhead lines, Pepco will not need to obtain any new real property or additional ROWs through eminent domain. Pepco also said that all work will take place within the company’s existing ROW or on real property controlled by the interconnection customer. To the extent any new real property rights are required to complete the project, the interconnection customer is to convey such rights to Pepco.

Among other things, Pepco said that it does not plan to increase the size of the existing transmission tower structures and it anticipates that the new pole structures will be about the same size as or smaller than the existing structures.

The additions are necessary to interconnect the planned generating facility, designated as the St. Charles Combined Cycle Facility, which will be located adjacent to Billingsley Road in Waldorf, Charles County, Md. PJM Interconnection has directed Pepco to provide an interconnection between CPV Maryland’s planned facility, which will be located adjacent to existing Pepco right-of-way (ROW) containing the existing overhead lines.

According to CPV Maryland’s 2011 application for a CPCN authorizing, for instance, the replacement of the already approved use of the General Electric 7FA.04 combustion turbines with the newer and more efficient GE 7FA.05 model turbines, thus increasing the facility’s nameplate capacity, the PSC granted CPV Maryland’s application for a CPCN for the construction and operation of the St. Charles project in 2008.

CPV said at the time that the GE 7FA.05 contains an improved compressor design that allows for a more efficient compressor of a larger mass airflow through the gas turbine.

As PennWell’s GenerationHub reported, FERC in September 2013 accepted an executed interconnection agreement filed by PJM for the 785-MW CPV Maryland project.

In its letter, Pepco said that to accommodate the interconnection, it must add up to four steel pole structures in line with and between two existing overhead transmission towers in its ROW. Those, Pepco added, would intercept and allow the extension of the lines to the facility. The interconnection customer would be solely responsible for the payment of all project-related costs.

The overhead line will remain energized at the same voltage after project completion.

Pepco is a subsidiary of Pepco Holdings (NYSE:POM).

About Corina Rivera-Linares 2850 Articles
Corina Rivera-Linares, chief editor for TransmissionHub, has covered the U.S. power industry for the past 14 years. Before joining TransmissionHub, Corina covered renewable energy and environmental issues, as well as transmission, generation, regulation, legislation and ISO/RTO matters at SNL Financial. She has also covered such topics as health, politics, and education for weekly newspapers and national magazines. She can be reached at