Baseline Key Backbone Facilities
PJM baseline upgrade projects are implemented to resolve reliability criteria violations. PJM “backbone” projects are a subset of baseline upgrade projects that have been given the informal designation of “backbone” due to their high degree of visibility within the stakeholder community. Backbone upgrades are on the EHV (Extra High Voltage) system and typically resolve a wide range of reliability criteria violations and market congestion issues. Their permitting and construction status is also typically tracked closely by the stakeholders. This area of the PJM website is intended to facilitate the communication of the status of the backbone upgrades.
Mount Storm-Doubs
Jacks Mountain
Mid-Atlantic Power Pathway (MAPP)
Potomac-Appalachian Transmission Highline (PATH)
Susquehanna - Roseland (S-R)
Construction Status Database Area
Upgrades to the transmission system are part of PJM's Regional Transmission Expansion Planning (RTEP) process. An outcome of the RTEP process are these Transmission System Upgrades:
- Expected (normal / emergency) Rating: expected normal continuous rating and long term 4 hour emergency rating based on summer 95 degree F temperature basis
Percent Complete - The percentages should be correlated to the following milestones:
- EP Status: 0% - 25% - Engineering and Planning (includes engineering, detailed design, materials procurement, resource planning)
- UC Status:
- 26% - 100% - Under Construction
- 26% - 90% - Construction Activities
- 91% - 100% - Testing and Inspection
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Engineering / Planning |
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Under Construction |
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On Hold - network upgrades associated with a queue project suspension or baselines impacted by an ongoing retool |
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In-Service - project complete, fully energized and planning criteria met |