Montana Power Outage History
50 counties tracked, 2014–2025. County-level reliability grades and outage frequency below.
Counties tracked
50
Avg national percentile
67th
Higher = more reliable
Grade F counties
1
County rankings (worst to best)
| County | Grade | National percentile |
|---|---|---|
| Lincoln County | F | 14th |
| Sanders County | D | 20th |
| Madison County | D | 31st |
| Granite County | D | 33rd |
| Flathead County | D | 35th |
| Chouteau County | D | 37th |
| Meagher County | D | 38th |
| Mineral County | D | 39th |
| Teton County | C | 41st |
| Missoula County | C | 42nd |
| Wheatland County | C | 48th |
| Valley County | C | 49th |
| Judith Basin County | C | 49th |
| Sweet Grass County | C | 54th |
| Powell County | C | 55th |
| Golden Valley County | C | 58th |
| Carbon County | B | 61st |
| Musselshell County | B | 61st |
| Blaine County | B | 64th |
| Park County | B | 66th |
| Phillips County | B | 69th |
| Liberty County | B | 69th |
| Wibaux County | B | 69th |
| Cascade County | B | 69th |
| Prairie County | B | 71st |
| Ravalli County | B | 72nd |
| Hill County | B | 72nd |
| Lewis and Clark County | B | 73rd |
| Sheridan County | B | 75th |
| Pondera County | B | 76th |
| Jefferson County | B | 77th |
| Rosebud County | B | 78th |
| Lake County | A | 80th |
| Daniels County | A | 81st |
| Broadwater County | A | 81st |
| Fergus County | A | 82nd |
| Richland County | A | 83rd |
| Deer Lodge County | A | 83rd |
| Beaverhead County | A | 84th |
| Custer County | A | 87th |
| Yellowstone County | A | 89th |
| Silver Bow County | A | 89th |
| Stillwater County | A | 90th |
| Gallatin County | A | 92nd |
| Dawson County | A | 93rd |
| Big Horn County | A | 94th |
| Fallon County | A | 94th |
| Roosevelt County | A | 94th |
| Powder River County | A | 95th |
| Carter County | A | 99th |