Electric grid interties
Explore named US electric grid interties, DC ties and market seams. Compare operator-reported flow where available, ratings, mapped locations and source notes. Coverage includes physical DC ties and AC paths plus market seams that combine several connections; it is not an inventory of every US intertie or balancing authority border.
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- 11
50 physical intertie profiles · 23 scheduling-point profiles · 5 market seams, across 11 markets.
Browse recordsHow to read an intertie
Flow and direction
Arrows show reported transfers of at least 1 MW. Smaller readings are shown as idle. A point can mean idle flow, a daily publication, an overdue update, or a connection without a public flow feed; open it to see its state and source time. Scheduling points show schedules separately from physical flow. A dash means no reading, while 0 MW means idle.
Rating and limits
A nameplate MW rating describes equipment. A posted directional transfer limit describes what the operator allows under current conditions, and may change. Neither is the same as actual flow.
NYISO
11 linksISO-NE
4 linksBPA
4 linksCAISO
28 links- Blythe 161 kV
- Crag View
- Cottonwood 230 kV
- Eldorado 230 kV
- McCullough–Eldorado 500 kV
- Lake
- Victorville–Lugo
- Marketplace
- Mona–Intermountain scheduling path
- Mead 230 kV
- North Gila 500 kV
- Oakdale
- Parker 230 kV
- Palo Verde West
- Rancho Seco
- Standiford
- Donner Summit 120 kV
- Sylmar AC
- Tracy–Tesla 230 kV
- Tracy COTP
- Westley–Fink
- Westley–Tesla
- Willow Beach scheduling path
- Energía Sierra Juárez tie line
- Miguel–Tijuana intertie
- Imperial Valley–Baja California Power intertie
- Imperial Valley–Termoeléctrica de Mexicali intertie
- Imperial Valley–La Rosita intertie
ERCOT
10 linksSPP
8 linksMISO
5 linksPJM
1 linksIESO
3 linksHydro-Québec
1 linksAESO
3 linksCoverage and sources
Where an operator feed is linked, the profile joins a named physical link or market seam to published interface identifiers. One seam can contain many AC ties; one physical link can have readings from both sides. The map marker is a representative location. Named terminals appear when substation or mapped-location records are available. Open a profile to inspect its own evidence.
Balancing authority interchange is a different measure: it totals transfers between authorities and does not identify the physical line carrying them. For that broader view, use the EIA’s hourly grid data.