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Electric companies in Montana

39 electric utilities serve Montana, according to US EIA-861 service-territory filings and live outage feeds. The largest by customers is NorthWestern Energy LLC - (MT), with about 438,851 customers in Montana (US EIA-861, 2025). Under 1% of the customers on file (540) buy their electricity from a separate retail supplier; the utility listed here still delivers it and restores outages.

Territory is filed by county, so a county can list several utilities; usually only one serves a given address, and your electric bill names it.

Find yours by ZIP code

Every electric utility in Montana

Largest first, by customers on its lines in Montana (US EIA-861, 2025). “Live” is whether MassOutage can see its outages.

UtilityTypeCustomersCountiesLiveReport an outage
NorthWestern Energy LLC - (MT)Investor Owned438,85136Live · county-
Flathead Electric Coop IncCooperative77,2886Live · county-
Montana-Dakota Utilities CoInvestor Owned25,49811Live · county-
Yellowstone Valley Elec Co-op-23,6836Live · county-
USBIA-Mission Valley Power-23,2504Live · county-
Missoula Electric Coop, IncCooperative16,7116Live · county-
Ravalli County Elec Coop, IncCooperative12,1942Live · county-
Vigilante Electric Coop, Inc-11,4209Live · county-
Glacier Electric Coop, Inc-7,9644No live feed-
Fergus Electric Coop, IncCooperative7,15714Live · county-
Lincoln Electric Coop, IncCooperative6,9092Live · county-
Park Electric Coop Inc-6,8914No live feed-
Beartooth Electric Coop, Inc-6,5383Live · county-
Sun River Electric Coop, IncCooperative6,3008Live · county-
McCone Electric Coop Inc-5,4819No live feed-
Lower Yellowstone R E A, IncCooperative5,2533Live · county-
Tongue River Electric Coop Inc-5,2298No live feed-
Northern Lights, IncCooperative5,0572Live · county-
Hill County Electric Coop, Inc-3,9855Live · county-
Marias River Electric Coop Inc-3,8193No live feed-
Sheridan Electric Coop, Inc-3,7654Live · county-
Big Horn County Elec Coop, Inc-3,7091No live feed-
Southeast Electric Coop, IncCooperative2,1964No live feed-
Fall River Rural Elec Coop IncCooperative2,1031Live · county-
Big Flat Electric Coop Inc-2,0623No live feed-
Mid-Yellowstone Elec Coop, IncCooperative2,0535No live feed-
NorVal Electric Cooperative, Inc-1,9305No live feed-
City of Troy - (MT)-1,0731No live feed-
Goldenwest Electric Coop, Inc-8533No live feed-
Powder River Energy CorpCooperative1732Live · county-
McKenzie Electric Coop IncCooperative1172No live feed-
Big Horn Rural Electric CoCooperative722No live feed-
Black Hills Power, Inc.Investor Owned472Live · county-
Avista CorpInvestor Owned321Live · countyOutage map ↗
WAPA-- Western Area Power Administration-1625No live feed-
Grand Electric Coop, Inc-161No live feed-
NorthWestern Energy--19No live feed-
Bonneville Power Administration--8No live feed-
Mountrail-Williams Elec CoopCooperative-1Live · county-

Electric utilities by county

Each county's utilities, largest in the state first. The county name opens its live outage page.

Electric companies in Montana: FAQ

How many electric companies serve Montana?
39 electric utilities serve Montana, according to US EIA-861 service-territory filings and live outage feeds.
What is the largest electric company in Montana?
NorthWestern Energy LLC - (MT), with about 438,851 customers in Montana (US EIA-861, 2025).
Which electric company serves my address in Montana?
Your electric bill names it. Service territory is filed by county, so MassOutage lists the utilities serving each Montana county; usually only one of them serves a given address, and a utility can tell you whether it serves yours.
Who do I call to report a power outage in Montana?
Your electric utility. MassOutage has an outage phone line, report page or outage map on file for 1 of the 39 utilities serving Montana, listed above; for the others, check your bill or the utility's website. For a downed power line, stay at least 35 feet away and call 911.

Live power outages in Montana →

Data from EIA Form 861 (utility reliability), every source we read. Service territory and customer counts are each utility's own EIA-861 filing; a utility a live outage feed has reported in a county is listed there too.