Montana–Alberta Tie Line
AESO ↔ Montana · AC transmission
A merchant 230 kV line from near Lethbridge to Great Falls, Montana. NorthWestern Energy, the balancing area on the Montana side, is not a market we carry, and its EIA-930 interchange with Alberta reads zero.
What it is carrying
Each operator's own reading, turned into a direction. Where both markets publish the tie, the two should agree.
- As AESO reports it
- 13 MW · AESO → Montana
as of Oct 10, 11:34 AM MDT
Last 30 days
Hourly flow, signed so that up is power leaving the market.
Above zero: AESO → Montana. Below: the reverse.
- Usual direction
- AESO → Montana in 63% of hours
63% out, 34% in, 3% idle across 721 hours
- Average
- 24 MW · AESO → Montana
- When busy
- 179 MW
95th percentile of hourly flow either way
- Peak AESO → Montana
- 273 MW
- Peak Montana → AESO
- 173 MW
- Direction changes
- 62
- Hours near its rating
- 0 of 721
At 95% or more of 300 MW
Hardware
Its terminals, placed from named HIFLD substations or other cited geospatial sources where available.
- Substation
- Lethbridge, Alberta
In Canada, outside HIFLD's coverage
- Substation
- Great Falls, MT
Not in HIFLD's dataset
Sources and method
Flow comes from AESO 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 AESO. 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.