massoutage

2021 Montana Power Outage Report

In 2021, the average Montana customer went without power for about 5.0 hours — the 20th worst of any US state that year, 1.4× the state's decade average. Figures from DOE/ORNL EAGLE-I.

Avg hrs / customer
5.0
Peak customers out
27,788
Rank (worst state)
20th
Counties affected
20

Montana outages over the decade

Average hours without power per customer, 2021 highlighted.

2.3h20151.8h20162.7h20171.9h20180.6h20195.6h20205.0h20213.5h20221.8h20238.5h20246.8h2025

Hardest-hit Montana counties in 2021

By peak customers out during the year's worst event.

1Lewis and Clark County27,7882Flathead County10,7953Gallatin County9,4194Sanders County7,4285Hill County7,1806Missoula County6,3787Cascade County6,0028Lincoln County5,9559Silver Bow County5,46810Valley County3,21711Mineral County3,20712Richland County2,96713Madison County2,86014Phillips County2,79615Meagher County2,65016Blaine County2,64117Dawson County2,57018Ravalli County2,45819Park County2,44020Broadwater County2,279

Biggest Montana outages of 2021

CountyBeganPeak customers out
Lewis and Clark CountyJune 3, 202127,788
Flathead CountyJanuary 13, 202110,795
Gallatin CountySeptember 15, 20219,419
Sanders CountyJanuary 13, 20217,428
Hill CountyNovember 5, 20217,180
Flathead CountyDecember 29, 20216,599
Flathead CountyNovember 15, 20216,546
Missoula CountyAugust 2, 20216,378
Gallatin CountyOctober 11, 20216,262
Cascade CountyApril 12, 20216,002
Montana by year:20252024202320222020201920182017
Other states in 2021:LAMIWVTXORMS

Part of the 2021 US Power Outage Report. Source: DOE/ORNL EAGLE-I. “Avg hours per customer” is a SAIDI-like measure (outage customer-minutes ÷ tracked customers); coverage varies by year.