PJM Interconnection’s transmission planning staff will recommend to the PJM board that the Potomac Appalachian Transmission Highline (PATH) and the Mid-Atlantic Power Pathway (MAPP) lines be removed from PJM’s regional transmission plans.
The recommendations will be presented on Aug. 9 during PJM’s Transmission Expansion Advisory Committee meeting, PJM added Aug. 8.
Grid conditions have changed since the lines were originally proposed and PJM’s updated analysis no longer shows a need for the lines to maintain grid stability.
PJM also noted that a slow economy has reduced the projected growth in electricity use and PJM’s most recent capacity auction added 4,900 MW of new generation and procured 14,833 MW of demand response.
Furthermore, while PJM’s analysis last year showed a diminished need for the transmission lines, the most responsible course was to wait to make a recommendation after analyzing the updated forecast of peak electricity use, the results of the 2012 capacity auction and the effects on grid stability of the anticipated announcement of generation retirements – 16,000 MW – due to environmental regulations, PJM said.
According to TransmissionHub data, PATH, a joint venture between Allegheny Energy and American Electric Power (NYSE:AEP), is a proposed 275-mile line, 765-kV transmission line that is designed to supply power from the Amos Substation in Putnam County, W.Va., to a proposed electrical substation in Frederick County, Md. Allegheny Energy merged with FirstEnergy (NYSE:FE) in February 2011.
The MAPP project, according to TransmissionHub data, would enable transfer of power sources west of the Chesapeake Bay from the Delmarva Peninsula to the mid-Atlantic region. The project, sponsored by Pepco Holdings (NYSE:POM), includes about 69 miles of AC lines and 83 miles of DC lines. One of the key components is a 39-mile HVDC undersea cable across the Chesapeake Bay. The project has been authorized an 11.3% ROE under FERC Order 679. In August 2011, the project online date was shifted from 2015 to the 2019-2021 timeframe.
PJM said the staff recommendation will be presented to the PJM Board’s Reliability Committee later this month.