PJM transmission map: lines and substations
Explore public transmission lines and substations across the PJM footprint, alongside PJM's market zones. Open the map to locate a site and inspect the infrastructure around it.
See it on the live PJM map, updating as the market publishes.
Explore the PJM transmission mapAbout this view
Locate PJM transmission infrastructure
The map uses public HIFLD transmission-line and substation records across the PJM footprint. Inspect the published names, geometry and voltage fields where available, with PJM's market zones for orientation.
Put a site in its grid context
Use the map to compare a site with nearby substations, lines and other available layers. The public inventory describes infrastructure geography; proximity to a line does not establish a connection point, available capacity or an approved interconnection.
Questions
What does this map show?
The transmission lines and substations published in the HIFLD public inventory, drawn across PJM's footprint and zones. It is geographic reference data — the operational network model, line ratings, and real-time flows stay with PJM and the transmission owners.
Why not use PJM's own network maps?
PJM's detailed system maps and power-flow cases are CEII and need an approved request to access. This View is built entirely from public data, so it answers the orientation question — where the lines and substations are — without that process.
Can I tell from the map where a project can interconnect?
It shows where the public network geography runs, which is the starting point. Whether a specific point of interconnection works is settled by PJM's interconnection studies and the transmission owner.
Will the map open with these layers?
Yes. It opens the live PJM workspace with the same transmission, substation, and zone layers and the same viewport shown on this page.