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Website · About · Legal · Privacy · Changelog · © 2026 Parisi Labs
  1. Home
  2. /Assets
  3. /Interties
  4. /Hydro-Québec Phase II
ISO-NE logo

Hydro-Québec Phase II

ISO-NE ↔ Hydro-Québec · HVDC line (line-commutated)

A multi-terminal HVDC line from James Bay hydro in northern Québec to the Sandy Pond converter in Ayer, Massachusetts: New England's largest single import path.

Now
928 MWISO-NE → Hydro-Québec
ISO-NE · as of Sep 26, 2:10 PM EDT
Between
ISO-NE and Hydro-Québec
Technology
HVDC line (line-commutated)
Rating
2,000 MW
Voltage
±450 kV DC
In service
1990
Published by
ISO-NE
Open on the map

What it is carrying

Each operator's own reading, turned into a direction. Where both markets publish the tie, the two should agree.

As ISO-NE reports it
928 MW · ISO-NE → Hydro-Québec

limit this way 1,200 MW · as of Sep 26, 2:10 PM EDT

Price across the seamReal-time · EDT
Reading prices…

Last 30 days

Hourly flow, signed so that up is power leaving the market.

As ISO-NE reports it928MW
1,205-205-1,614Aug 27, 2 PMSep 26, 2 PM

Above zero: ISO-NE → Hydro-Québec. Below: the reverse.

Hardware

Its terminals. US terminals are placed on the substation HIFLD's national dataset names for them.

Converter
Radisson converter, Québec

In Canada, outside HIFLD's coverage

Converter
Nicolet converter, Québec

In Canada, outside HIFLD's coverage

Converter
Sandy Pond converter, MA

42.5684, -71.5304 · 345 kV

Related interties

  • Champlain Hudson Power Express
    NYISO ↔ Hydro-Québec
  • Hydro-Québec–New York
    NYISO ↔ Hydro-Québec
  • Cedars Rapids
    NYISO ↔ Hydro-Québec
  • Highgate
    ISO-NE ↔ Hydro-Québec
  • New England Clean Energy Connect
    ISO-NE ↔ Hydro-Québec
  • New Brunswick–New England
    ISO-NE ↔ New Brunswick
Usual direction
ISO-NE → Hydro-Québec in 54% of hours

54% out, 26% in, 21% idle across 721 hours

Average
210 MW · ISO-NE → Hydro-Québec
When busy
1,002 MW

95th percentile of hourly flow either way

Peak ISO-NE → Hydro-Québec
1,010 MW
Peak Hydro-Québec → ISO-NE
1,420 MW
Direction changes
43
Hours near its rating
0 of 721

At 95% or more of 2,000 MW

The average day
0:006:0012:0018:0023:00
Mean flow by the market's local hour. Up: ISO-NE → Hydro-Québec. Down: Hydro-Québec → ISO-NE.