Outage Almanac

Iowa power outages

99 counties with outage records. Pick one to see its history.

Iowa averaged 0.85 times the US outage time per person

That ranks 25 of 50 states and DC, where 1 has the most. August and July made up 76% of outage time. Records run from 2015 to 2023, and some counties start later.

Marshall County had the most outage time per resident of 97 rated counties.

Counties ranked by outage time

RankCountyMajor outages per yearLongest (hours)Times US rate
1Marshall County1.22123.35
2Linn County0.92113.32
3Tama County0.32122.68
4Poweshiek County0.62122.66
5Jasper County0.42122.32
6Benton County0.42122.29
7Clinton County0.92102.16
8Cedar County0.32112.09
9Monroe County1.1261.41
10Greene County0.2751.39
11Iowa County0.8991.37
12Scott County1.41551.16
13Boone County0.32131.12
14Worth County0.2640.99
15Story County0.42120.98
16Jones County0.31860.92
17Johnson County1.01750.89
17Winnebago County0.4710.89
19Calhoun County0.4290.84
20Mills County0.6540.83
21Howard County0.2420.82
22Keokuk County0.3340.78
23Appanoose County0.4310.77
24Fremont County0.2450.73
24Grundy County0.41070.73
26Polk County1.71450.69
27Wright County0.3270.67
28Winneshiek County0.8400.63
29Fayette County0.7400.61
29Guthrie County0.3720.61
29Hardin County0.4750.61
29Washington County0.3280.61
33Mitchell County0.4420.60
34Webster County0.9520.59
35Allamakee County0.4240.58
36Lee County0.7560.57
37Louisa County0.7170.51
37Page County0.7520.51
39Jefferson County0.2140.50
39Van Buren County0.3180.50
41Henry County0.6200.48
42Floyd County0.3410.46
43Franklin County0.3270.44
43Hancock County0.4410.44
45Cerro Gordo County0.7320.43
46Delaware County0.3210.40
46Pottawattamie County0.8840.40
48Dallas County0.42130.39
49Butler County0.6200.38
49Humboldt County0.3120.38
51Des Moines County0.4260.35
52Audubon County0.190.34
52Hamilton County0.7370.34
54Dickinson County0.2120.32
55Wapello County0.6200.31
56Clayton County0.6230.30
56Harrison County0.2160.30
58Sac County0.1110.28
58Wayne County0.2110.28
60Monona County0.2120.27
60Warren County0.6970.27
62Crawford County0.6180.26
63Buchanan County0.9240.24
63Ida County0.290.24
63Taylor County0.1100.24
66Mahaska County0.2260.23
67Jackson County0.4440.22
67Palo Alto County0.0None0.22
67Pocahontas County0.1110.22
70Montgomery County0.1100.21
70Muscatine County0.21260.21
70Osceola County0.2370.21
70Woodbury County0.3360.21
74Chickasaw County0.3400.20
75Cass County0.2160.19
76Black Hawk County0.7200.18
76Carroll County0.6160.18
76Dubuque County0.6220.18
76Kossuth County0.1120.18
76Marion County0.2260.18
81Lucas County0.1100.16
81Lyon County0.1220.16
81Madison County0.4160.16
81Shelby County0.0None0.16
81Union County0.2200.16
86O'Brien County0.0None0.15
87Cherokee County0.0None0.14
87Clarke County0.3120.14
89Plymouth County0.1210.12
89Sioux County0.2250.12
91Decatur County0.0None0.11
92Buena Vista County0.1120.10
92Davis County0.1140.10
94Adair County0.1140.09
94Bremer County0.2100.09
96Clay County0.1160.07
97Emmet County0.0None0.06

Rank uses outage time per resident. Times US rate compares each county with the national average.

When outages hit Iowa

Share of the state's customer-hours by month.

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JanJFebFMarMAprAMayMJunJJulJAugASepSOctONovNDecD

Not rated

These counties have short histories, very small populations, or customer counts that look too high for the population.