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Website · About · Legal · Privacy · Changelog · © 2026 Parisi Labs
  1. Home
  2. /Assets
  3. /Interties
  4. /Montana–Northwest
BPA logo

Montana–Northwest

BPA ↔ Montana · AC transmission

The 500 kV path west from Colstrip through Garrison that carries Montana generation to the Pacific Northwest.

Now
1,841 MWMontana → BPA
BPA · as of Sep 26, 12:00 AM PDT
Between
BPA and Montana
Technology
AC transmission
Voltage
500 kV
Published by
BPA
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 BPA reports it
1,841 MW · Montana → BPA

limit this way 2,200 MW · as of Sep 26, 12:00 AM PDT

Last 30 days

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

As BPA reports it-1,841MW
-150-1,229-2,307Aug 27, 12 PMSep 26, 12 AM

Above zero: BPA → Montana. Below: the reverse.

Usual direction
Montana → BPA in 100% of hours

0% out, 100% in, 0% idle across 708 hours

Average
1,304 MW · Montana → BPA
When busy
1,921 MW

95th percentile of hourly flow either way

Peak BPA → Montana
0 MW
Peak Montana → BPA
2,159 MW
Direction changes
0
The average day
0:006:0012:0018:0023:00
Mean flow by the market's local hour. Up: BPA → Montana. Down: Montana → BPA.

Hardware

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

Substation
Colstrip, MT

45.8911, -106.6128 · 500 kV

Substation
Garrison, MT

46.5161, -112.8880 · 500 kV

Related interties

  • California–Oregon Intertie
    BPA ↔ California
  • Pacific DC Intertie
    BPA ↔ California
  • Northern Intertie
    BPA ↔ British Columbia