New England–New York AC interface
NYISO ↔ New England · AC with phase-angle regulation
The AC ties across the New York–New England border, from Plattsburgh–Sand Bar in the north to Pleasant Valley–Long Mountain in the south.
Operator readings
Compare each operator’s reading at its stated time. Scheduled transfers and metered physical flow measure different things.
- As NYISO reports it
- 1,560 MW · NYISO → New England
Current reading · limit this way 1,800 MW · 0 MW left to schedule · as of Nov 10, 6:50 PM EST
- As ISO-NE reports it
- 1,647 MW · NYISO → New England
Current reading · limit this way 1,600 MW · as of Nov 10, 6:35 PM EST
Last 30 days
Hourly readings, signed so that up is power leaving the market. Each series identifies whether it measures flow or a transfer schedule.
Above zero: NYISO → New England. Below: the reverse.
- Usual direction
- NYISO → New England in 81% of hours
81% out, 19% in, 0% idle across 721 hours
- Average
- 590 MW · NYISO → New England
- When busy
- 1,598 MW
95th percentile of hourly flow either way
- Peak NYISO → New England
- 1,604 MW
- Peak New England → NYISO
- 1,200 MW
- Direction changes
- 70
Hardware
Its terminals, placed from named HIFLD substations or other cited geospatial sources where available.
- Substation
- Alps, NY
42.5961, -73.4970 · 345 kV
- Substation
- Pleasant Valley, NY
41.7394, -73.8348 · 345 kV
- Substation
- Long Mountain, CT
41.6204, -73.4422 · 345 kV
- Substation
- Plattsburgh, NY
44.7591, -73.4930 · 230 kV
- Substation
- Sand Bar, VT
44.6092, -73.2061 · 115 kV
Sources and method
Readings come from NYISO and ISO-NE interface readings. Each value is shown with its operator and source time; direction is normalized from that operator’s sign convention toward or away from NYISO. A rating describes the equipment; an operator’s posted directional limit, when available, is a separate operating value. The map point identifies a sourced terminal or crossing where available, or a representative connection point; it does not trace the full route.