South Carolina Electric & Gas (SCE&G) is seeking regulatory approval for the Pepperhill-Summerville 230-kV Line, the Williams-Pepperhill 230-kV Line Segment, the Canadys-Faber Place 230-kV Line Segment, and associated facilities in Berkeley and Charleston counties in South Carolina.
As noted in the company’s June 14 application filed with the Public Service Commission of South Carolina for a certificate of environmental compatibility and public convenience and necessity for the construction and operation of the facilities:
- The Pepperhill-Summerville line would be 7.8 miles long and extend from SCE&G’s existing Pepperhill 230/115-kV substation in North Charleston, S.C., to the company’s existing Summerville 230/115-kV substation near Summerville, S.C.
- The Williams-Pepperhill line segment would be 3.64 miles long and extend from existing right of way (ROW) about 400 feet south of Ancrum Road to SCE&G’s Pepperhill substation
- The Canadys-Faber Place line segment would be about 350 feet long
Discussing the project’s need, SCE&G said that its recent transmission planning power flow studies have identified a possible future single contingency occurrence in the southern region of its service area, i.e., an outage on the Summerville substation’s 230-kV #2 Bus, that would result in outages on a 230/115-kV transformer at the Summerville substation, the loss of service on two 230-kV lines, and heavy loading/overloading on other electrical equipment, as well as constitute violations of NERC Transmission Planning Standards and SCE&G’s long-range planning criteria as early as May 2020.
To prevent heavy loading/overloading on electrical equipment, SCE&G proposes to add the Pepperhill-Summerville line, the Williams-Pepperhill line segment, and associated facilities to its electrical transmission system in the southern region of its electrical service area. The company added that the addition of those two 230-kV lines would mitigate the identified contingency and improve power flow in the southern region of SCE&G’s service area.
To accommodate that work, the existing Pepperhill-Faber Place 230-kV Line would be disconnected from its 230-kV terminal at the Pepperhill substation and reconnected to the Canadys 230/115-kV substation. The company also said that to accomplish that new connection at the Canadys substation, one span of the existing Pepperhill-Faber Place line – the span now connected to the 230-kV line terminal at the Pepperhill substation – about 350 feet long, would be relocated and connected to the remaining portion of the existing Williams-Canadys 230-kV Line, which would be available after a portion of the Williams-Canadys line is terminated at the Pepperhill substation to form the Williams-Pepperhill line segment.
When that connection is completed, the name of the existing Pepperhill-Faber Place line would be changed to the Canadys-Faber Place 230-kV Line, the company said.
The company noted that according to the May “Transmission Line Siting and Environmental Report for the Pepperhill-Summerville 230 kV Line, Williams-Pepperhill 230 kV Line Segment and Associated Facilities,” which was prepared by the Facilities Planning & Siting Division of UC Synergetic, LLC, the proposed lines and associated facilities would have no adverse impacts on such things as land use, soils, and wetlands/streams. Among other things, the company said that the absence of impacts is significantly due to the utilization of existing and cleared ROWs for the lines.
SCE&G is a subsidiary of SCANA (NYSE:SCG).