Progress Energy Carolinas (PEC) said in its integrated resource plan (IRP), dated November 2012 and filed with the Public Service Commission of South Carolina, that its transmission system is expected to continue to provide reliable service to its native load and firm transmission customers.
The IRP, which reflects current forecasts and management approved changes to resources, included transmission line projects that PEC has agreed to build as part of its merger commitments as well as line and substation projects that were planned pre-merger.
Duke Energy (NYSE:DUK) acquired Progress Energy on July 2.
Merger mitigation line additions include the 230-kV Lilesville to Rockingham and the 230-kV Greenville to Kinston Dupont lines. Non-merger related transmission line additions include the 230-kV Richmond to Raeford line and the 230-kV Ft. Bragg Woodruff St. to Raeford line.
The Lilesville to Rockingham line involves building about 14 miles of new 230-kV line from the Lilesville 230-kV substation in Anson County to the Rockingham 230-kV substation in Richmond County. Its estimated in-service date is June 2014.
The company also noted that the Greenville to Kinston Dupont line entails building about 25.3 miles of new 230-kV line from the Greenville 230-kV substation in Pitt County to the Kinston DuPont 230-kV substation in Lenoir County. It also has an estimated in-service date of June 2014.
The Richmond to Raeford 230-kV line will loop-in the existing 230-kV transmission line from the Richmond 230-kV substation in Richmond County to the Ft. Bragg Woodruff St. 230-kV substation in Cumberland County at the Raeford 230-kV substation in Hoke County. PEC also said the estimated in-service date is June 2018.
Among other projects, PEC also noted that the Harris to Research Triangle Park (RTP) 230-kV line entails building 22 miles of new 230-kV line from the Harris 230-kV substation in Wake County to the RTP 230-kV substation in Wake County. The projected in-service date is June 2014.
The PEC transmission system consists of about 6,200 miles of 69-kV, 115-kV, 138-kV, 161-kV, 230-kV and 500-kV lines and just over 100 transmission-class switching stations in its North Carolina and South Carolina service areas.
PEC also noted it has transmission interconnections with Duke Energy‘s (NYSE:DUK) Duke Energy Carolinas, PJM Interconnection – through American Electric Power (NYSE:AEP) and Dominion Virginia Power – South Carolina Electric & Gas and South Carolina Public Service Authority d/b/a Santee Cooper, among others.
The most recent SERC Reliability Corporation (SERC) Region audit of PEC, in the spring of 2011, found “no possible violations” of the NERC reliability standards.
PEC also noted that transmission planning typically takes into consideration a 10-year planning period and planning is based on PEC’s long-range system peak load forecast, PEC’s resource plan as well as local area forecasts for retail, wholesale and industrial loads.
The transmission planning process and the generation resource planning process are interrelated, the company said, noting that the location and availability of generation additions have significant impacts on the adequacy of the transmission system.
By planning for generation and transmission needs, PEC is able to minimize costs while maintaining good performance. “PEC will interconnect new generating facilities to the transmission system and will accommodate increases in the generating capacity of existing generation [under] its established interconnection procedures,” the company added.
Among other things, PEC said that coordinated near-term operating studies and longer range planning studies, involving representatives from the Virginia-Carolinas subregion and adjacent subregions and regions, are made on a regular basis to ensure that transmission capacity will continue to be adequate.
Furthermore, PEC participates in the Southeastern Interregional Participation Process and the Eastern Interconnection Planning Collaborative interregional efforts.