Electric Substations in Montana
149 named substations in Montana, with the highest-voltage facilities listed first. Each substation profile shows voltage class, connected transmission lines, and the datacenter candidate sites closest to it.
At a glance
How is Montana's substation network split by voltage?
By maximum voltage, the named substations break down as 5 at 500 kV and above; 45 at 230–344 kV; 34 at 115–229 kV; 58 at 69–114 kV; 3 below 69 kV; 4 withvoltage not recorded. 3% of Montana's named substations operate at 345 kV or above, against 8% across all 16,654 named US substations. The state median of 115 kV is level with the national median of 115 kV.
How does Montana compare with other states?
Montana ranks 32nd of 50 states and DC by number of named substations and 43rd by named substations at 345 kV or above. It also has 2,542 scored datacenter candidate sites with an average DC Readiness score of 54.3 (national average 53), and an average power sub-score of 37.1 against 37.4 nationally. Most of those sites (1,963) are in the WECC market.
Which substations in Montana have the highest voltage?
| Substation | Max voltage | Connected lines | Line owner |
|---|---|---|---|
| BROADVIEW | 500 kV | 11 | NORTHWESTERN ENERGY LLC - (MT) |
| COLSTRIP | 500 kV | 13 | TONGUE RIVER ELECTRIC COOP INC |
| GARRISON | 500 kV | 8 | BONNEVILLE POWER ADMINISTRATION |
| HOT SPRINGS | 500 kV | 3 | BONNEVILLE POWER ADMINISTRATION |
| TAFT | 500 kV | 5 | BONNEVILLE POWER ADMINISTRATION |
| ALKALI CREEK | 230 kV | 6 | NORTHWESTERN ENERGY LLC - (MT) |
| ANACONDA | 230 kV | 3 | BONNEVILLE POWER ADMINISTRATION |
| BAKER | 230 kV | 8 | MONTANA-DAKOTA UTILITIES CO |
| BILLINGS | 230 kV | 13 | NORTHWESTERN ENERGY LLC - (MT) |
| COLUMBIA FALLS | 230 kV | 5 | BONNEVILLE POWER ADMINISTRATION |
| COLUMBUS-RAPELJE AUTO | 230 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| CONKELLEY | 230 kV | 3 | BONNEVILLE POWER ADMINISTRATION |
| CONRAD | 230 kV | 5 | NORTHWESTERN ENERGY LLC - (MT) |
| CROSSOVER | 230 kV | 4 | NORTHWESTERN ENERGY LLC - (MT) |
| CUSTER | 230 kV | 4 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| DAWSON COUNTY | 230 kV | 7 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| DECKER | 230 kV | 2 | BASIN ELECTRIC POWER COOP |
| DIXON | 230 kV | 2 | MISSION VALLEY POWER |
| DUTTON PUMP | 230 kV | 1 | NORTHWESTERN ENERGY LLC - (MT) |
| FLATHEAD | 230 kV | 5 | FLATHEAD ELECTRIC COOP INC |
| FORT PECK | 230 kV | 5 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| GREAT FALLS (RAINBOW) | 230 kV | 10 | NORTHWESTERN ENERGY LLC - (MT) |
| GREAT FALLS (RAINBOW) | 230 kV | 6 | NORTHWESTERN ENERGY LLC - (MT) |
| HARDEN | 230 kV | 6 | NORTHWESTERN ENERGY LLC - (MT) |
| HARLEM | 230 kV | 5 | NORTHWESTERN ENERGY LLC - (MT) |
| HASKILL | 230 kV | 2 | BONNEVILLE POWER ADMINISTRATION |
| HAVRE / ASSINNIBOINE | 230 kV | 10 | NORTHWESTERN ENERGY LLC - (MT) |
| HOT SPRINGS | 230 kV | 7 | BONNEVILLE POWER ADMINISTRATION |
| HUNGRY HORSE | 230 kV | 4 | BONNEVILLE POWER ADMINISTRATION |
| JUDITH GAP | 230 kV | 5 | FERGUS ELECTRIC COOP, INC |
| JUDITH GAP WIND FARM | 230 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| LANDERS FORK | 230 kV | 2 | NORTHWESTERN ENERGY LLC - (MT) |
| LIBBY | 230 kV | 5 | BONNEVILLE POWER ADMINISTRATION |
| LION MOUNTAIN | 230 kV | 4 | BONNEVILLE POWER ADMINISTRATION |
| MALTA | 230 kV | 4 | NORTHWESTERN ENERGY LLC - (MT) |
| MILES CITY | 230 kV | 2 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| MILES CITY | 230 kV | 5 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| MILL CREEK GENERATING STATION | 230 kV | 14 | NORTHWESTERN ENERGY LLC - (MT) |
| NOXON | 230 kV | 9 | AVISTA CORP |
| OVANDO | 230 kV | 4 | NORTHWESTERN ENERGY LLC - (MT) |
| PLACID LAKE | 230 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| RATTLESNAKE | 230 kV | 10 | MISSOULA ELECTRIC COOP, INC |
| RICHARDSON COULEE | 230 kV | 4 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| ROSEBUD CREEK | 230 kV | 3 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| SHELBY | 230 kV | 4 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| SHOREY ROAD | 230 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| THREE RIVERS | 230 kV | 9 | NORTHWESTERN ENERGY LLC - (MT) |
| VERONA | 230 kV | 5 | NORTHWESTERN ENERGY LLC - (MT) |
| WILSALL | 230 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| WOLF POINT | 230 kV | 6 | WAPA-- WESTERN AREA POWER ADMINISTRATION |
| KERR | 161 kV | 8 | NORTHWESTERN ENERGY LLC - (MT) |
| CULBERTSON | 138 kV | 4 | MONTANA-DAKOTA UTILITIES CO |
| DEAD HEAD | 138 kV | 1 | NORTHWESTERN ENERGY LLC - (MT) |
| DEAD HEAD | 138 kV | 1 | NORTHWESTERN ENERGY LLC - (MT) |
| TOSTON | 138 kV | 2 | VIGILANTE ELECTRIC COOP, INC |
| TREGO | 138 kV | 3 | LINCOLN ELECTRIC COOP, INC |
| BIG TIMBER AUTO | 115 kV | 4 | NORTHWESTERN ENERGY LLC - (MT) |
| BILLINGS EASTSIDE | 115 kV | 2 | NORTHWESTERN ENERGY LLC - (MT) |
| BOZEMAN SOUTH | 115 kV | 3 | NORTHWESTERN ENERGY LLC - (MT) |
| CLINTON | 115 kV | 1 | MISSOULA ELECTRIC COOP, INC |
Every named substation in Montana
All 149 named substations, grouped by voltage band.
500 kV and above · 5
230–344 kV · 45
- ALKALI CREEK
- ANACONDA
- BAKER
- BILLINGS
- COLUMBIA FALLS
- COLUMBUS-RAPELJE AUTO
- CONKELLEY
- CONRAD
- CROSSOVER
- CUSTER
- DAWSON COUNTY
- DECKER
- DIXON
- DUTTON PUMP
- FLATHEAD
- FORT PECK
- GREAT FALLS (RAINBOW)
- GREAT FALLS (RAINBOW)
- HARDEN
- HARLEM
- HASKILL
- HAVRE / ASSINNIBOINE
- HOT SPRINGS
- HUNGRY HORSE
- JUDITH GAP
- JUDITH GAP WIND FARM
- LANDERS FORK
- LIBBY
- LION MOUNTAIN
- MALTA
- MILES CITY
- MILES CITY
- MILL CREEK GENERATING STATION
- NOXON
- OVANDO
- PLACID LAKE
- RATTLESNAKE
- RICHARDSON COULEE
- ROSEBUD CREEK
- SHELBY
- SHOREY ROAD
- THREE RIVERS
- VERONA
- WILSALL
- WOLF POINT
115–229 kV · 34
69–114 kV · 58
- APPLEWAY
- ARLEE
- BADROCK
- BANNACK
- BIG SANDY
- BIG TIMBER CITY
- BUTTE PIPELINE
- CAMAS
- CHINOOK
- CIRCLE #1
- CORVALLIS
- CRANE
- CUTBANK PUMP
- DARBY
- DEAD HEAD
- EAST BENCH
- EAST SIDNEY
- FINLEY POINT
- FORT BENTON
- FRENCHTOWN
- GRANTSDALE
- HARDEN
- HUSON
- JORDAN
- KALISPELL
- KERR
- LAKE BLAINE
- LASALLE
- LEWISTOWN NO. 1
- LINDSAY
- LIVINGSTON WESTSIDE
- LUMP GULCH
- MILES CITY
- MORRELL
- MOSSMAIN
- NASHUA
- NINEPIPE
- PARK CITY
- PETERSON FLATS
- POINT OF ROCKS
- REED POINT
- RETAH
- RICHLAND
- RIDGELAWN
- SHELBY
- STEVENSVILLE
- STILLWATER
- SWITCH
- SWITCH
- SWITCH
- SWITCH
- SWITCH
- THOMPSON FALLS
- VAILIER WILLIAMS
- VICTOR
- WHITEFISH
- WHITEHALL
- WOLD
below 69 kV · 3
voltage not recorded · 4
Frequently asked questions
How many electric substations are in Montana?
HIFLD records 1,211 substations in Montana, of which 149 carry a station name. That is the 32nd-most named substations of any state in the dataset.
What is the highest-voltage substation in Montana?
5 named substations in Montana share the top voltage of 500 kV, including BROADVIEW, COLSTRIP, GARRISON.
Which substation in Montana connects the most transmission lines?
MILL CREEK GENERATING STATION has the most connected transmission lines of the named substations listed here, with 14 at up to 230 kV.
How many substations in Montana are 345 kV or higher?
5 of 149 named substations (3%) operate at 345 kV or above, compared with 8% nationally. Montana ranks 43rd of 50 states and DC for named substations at that level.
How many datacenter candidate sites in Montana are at substations?
815 of the 2,542 scored candidate sites in Montana are substation sites — locations generated at an existing substation. Scored sites across Montana average 54.3 on the 0–100 DC Readiness scale, against 53 nationally.
Looking for a specific record? The directory lists every substation in Montana, A to Z.
More on Montana, and states with similar counts
About this data
Source: HIFLD Electric Substations and Transmission Lines (U.S. Department of Homeland Security), as published June 29, 2026. See the methodology for how records are matched, cleaned and scored.
Cite as: GridCensus, “Electric substations in Montana”, https://gridcensus.com/substations/montana (data as of June 29, 2026).
Dataset updated . Screening estimates derived from public data sources.
Go deeper than the public screen
Every site and score for substations in Montana is free to browse. Pro adds Watchtower on 25 sites, alerts when new candidate sites, datacenters or interconnection-queue requests appear in your markets, score and capacity history, and CSV export. Enterprise adds team seats, weekly data files for all 147,272 sites, the REST API and an MCP server for AI tools.