Public HIFLD transmission lines and substations across New York, shown with NYISO's eleven load zones. Orient an asset, county, or development area against the network geography, then open the same layers on the live map.
The transmission-line and substation features available in the Homeland Infrastructure Foundation-Level Data (HIFLD) public inventory, placed beside NYISO market zones on Ask the Grid's interactive map.
New York's transmission picture splits between generation-heavy upstate corridors and the constrained import paths feeding New York City and Long Island. Read the public line and substation geography against the zone boundaries to see which side of that split a site sits on, then take the electrical questions — available capability, constraints, feasibility — to the NYISO and utility study process.
The transmission lines and substations published in the HIFLD public inventory, drawn across NYISO's load zones. It is geographic reference data — the operational network model, line flows, and available transfer capability stay with NYISO.
It shows you where the public network geography runs, which is the starting point. Whether a specific point of interconnection works is settled by the applicable utility's and NYISO's study process.
Yes. The Ask the Grid catalog page documents the HIFLD transmission-line dataset, source, schema, and available coverage.