massoutage

2018 Montana Power Outage Report

In 2018, the average Montana customer went without power for about 1.9 hours, the 42nd worst of 51 states (US average 5.3 hours). Figures from DOE/ORNL EAGLE-I, including major storm days.

Avg hrs / customer
1.9
vs prior year
▼ 29%
vs 2017
Customer-hours out
341K
Peak customers out
12,775
across the state at once
EAGLE-I coverage
16%
of MT customers
Counties reporting
20

Montana year over year

Montana: average hours without power per customer by year2015: 2.3h; 2016: 1.8h; 2017: 2.7h; 2018: 1.9h, coverage 16%; 2019: 0.6h, coverage 75%; 2020: 5.6h, coverage 76%; 2021: 4.9h, coverage 76%; 2022: 3.5h, coverage 76%; 2023: 1.8h; 2024: 8.5h; 2025: 6.7h02.557.5100%50%100%2.3h20151.8h20162.7h20171.9h20180.6h20195.6h20204.9h20213.5h20221.8h20238.5h20246.7h2025
Use the arrow keys to read values.
Average hours without power per customer. Line: EAGLE-I coverage, share of customers tracked (right axis).

Month by month, 2018

Customer-hours without power across Montana; June was the worst.

CSVJSON
Montana customer-hours without power by month, 2018Jan 43K, Feb 32K, Mar 11K, Apr 28K, May 50K, Jun 56K, Jul 42K, Aug 31K, Sep 8,745, Oct 24K, Nov 8,781, Dec 6,773020k40k60k43KJan32KFeb11KMar28KApr50KMay56KJun42KJul31KAug8,745Sep24KOct8,781Nov6,773Dec
Use the arrow keys to read values.

All 20 Montana counties, 2018

Ranked by average hours without power per customer. Each county links to its annual report.

CSVJSON
#CountyHrs / customerCustomer-hoursCustomersPeak outEvents
1Sheridan County19.134K1,7661,19412
2Lincoln County5.976K12,7215,634233
3Wibaux County3.12,0986753666
4Richland County2.727K9,8052,86433
5Flathead County2.2147K65,57512,775748
6Sanders County2.015K7,3141,346144
7Rosebud County2.09,1954,6471,14315
8Park County0.86,8438,76334515
9Dawson County0.75,2207,43581931
10Roosevelt County0.64,1747,25268743
11Lake County0.411K24,041466116
12Custer County0.42,6066,94296939
13Powder River County0.2143583153
14Prairie County0.21767581145
15Fallon County0.25242,2808514
16Carter County0.133508331
17Mineral County0.01002,45584
18Madison County0.0216,19954
19Carbon County0.046,51211
20Daniels County-1,536-5339

Biggest Montana outages of 2018

Up to 25 county outage episodes with the most customers out at once.

CSVJSON
#CountyStarted (UTC)Ended (UTC)DurationPeak outCustomer-hours
1Flathead County, MTOctober 31, 2018 18:15October 31, 2018 22:304h 15m12,7758,053
2Flathead County, MTOctober 15, 2018 18:30October 16, 2018 00:005h 30m6,6843,073
3Flathead County, MTMay 16, 2018 23:30May 17, 2018 04:455h 15m5,88212K
4Lincoln County, MTMay 11, 2018 16:30May 11, 2018 18:151h 45m5,6341,410
5Richland County, MTFebruary 13, 2018 12:45February 13, 2018 15:002h 15m2,8644,084
6Flathead County, MTJune 3, 2018 14:15June 3, 2018 19:305h 15m2,6087,128
7Flathead County, MTJanuary 19, 2018 08:00January 19, 2018 14:456h 45m2,38913K
8Lincoln County, MTFebruary 9, 2018 02:15February 9, 2018 19:3017h 15m2,2528,458
9Flathead County, MTMay 7, 2018 20:30May 7, 2018 22:001h 30m1,824926
10Lincoln County, MTJune 22, 2018 00:15June 22, 2018 03:153h1,7902,786
11Flathead County, MTFebruary 8, 2018 22:15February 9, 2018 17:0018h 45m1,7397,206
12Flathead County, MTApril 21, 2018 19:15April 22, 2018 01:005h 45m1,6584,969
13Richland County, MTMay 24, 2018 00:00May 24, 2018 01:451h 45m1,6141,876
14Richland County, MTAugust 9, 2018 21:30August 18, 2018 11:008d 13h1,5476,636
15Lincoln County, MTJune 11, 2018 01:30June 11, 2018 03:001h 30m1,5352,139
16Lincoln County, MTMay 18, 2018 22:30May 18, 2018 23:1545m1,522761
17Flathead County, MTMay 22, 2018 07:45May 22, 2018 11:454h1,5215,705
18Lincoln County, MTJune 27, 2018 05:45June 27, 2018 12:006h 15m1,5219,506
19Lincoln County, MTMay 17, 2018 00:30May 17, 2018 06:456h 15m1,5213,525
20Lincoln County, MTNovember 6, 2018 15:30November 6, 2018 16:0030m1,520760
21Lincoln County, MTMay 17, 2018 19:45May 17, 2018 20:0015m1,520380
22Lincoln County, MTApril 2, 2018 05:00April 2, 2018 08:303h 30m1,5164,773
23Richland County, MTFebruary 15, 2018 10:15February 15, 2018 10:4530m1,511379
24Flathead County, MTApril 8, 2018 02:15April 8, 2018 08:306h 15m1,4582,053
25Flathead County, MTJune 10, 2018 00:15June 10, 2018 11:1511h1,3762,185
EAGLE-I tracked about 16% of Montana's electricity customers in 2018; outages at utilities it does not see are not counted. Hours per customer divide outage customer-minutes by modeled county customers.
Montana by year:2025202420232022202120202019201720162015
Other states in 2018:NCVAWVMARIVTMEMI

Part of the 2018 US Power Outage Report.

Data from DOE EAGLE-I, every source we read.