DenaliPower Outage History
2016–2025 · Alaska
Bottom 20% least reliable nationally — frequent and/or long outages. This county ranks in the least reliable fifth of all US counties in our dataset: some combination of frequent outages, long restoration times, or customers affected puts it near the bottom nationally. Backup power is worth prioritizing here rather than treating it as optional.
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| Oct 9, 2023 | 1 hrs | 1,497 (100%) | Unnamed event |
| Dec 22, 2018 | <1 hr | 1,358 (91%) | Unnamed event |
| Feb 22, 2022 | 1 hrs | 1,158 (77%) | Unnamed event |
| Feb 18, 2022 | 1 hrs | 1,158 (77%) | Unnamed event |
| Oct 27, 2021 | <1 hr | 1,148 (77%) | Unnamed event |
Over the 10 years from 2016 to 2025, Denali recorded 320 distinct power outage events, averaging 3.6 hours per event.
The single worst outage on record in Denali started October 9, 2023, lasting 1 hours and leaving up to 1,497 customers without power (100% of the county) at its peak.
December has historically been the worst month for outages in Denali, with 38 events recorded during that month across the dataset.
Based on this history, Denali earns a Reliability Grade of F, placing it in the 14th percentile nationally for grid reliability (higher percentile = more reliable).
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Read our mission →Similar counties in Alaska
Counties with the closest reliability grade and national percentile to Denali.
| County | Grade | National percentile |
|---|---|---|
| Southeast Fairbanks | D | 23rd |
| Matanuska-Susitna | D | 23rd |
| Kenai Peninsula | D | 27th |
| Fairbanks North Star | D | 33rd |
| Anchorage | C | 59th |
Most reliable counties in Alaska
The top 3 counties in Alaska by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Valdez-Cordova | A | 99th |
| Yukon-Koyukuk | A | 88th |
| Anchorage | C | 59th |
Least reliable counties in Alaska
The bottom 3 counties in Alaska by reliability grade and percentile.
| County | Grade | National percentile |
|---|---|---|
| Denali | F | 14th |
| Southeast Fairbanks | D | 23rd |
| Matanuska-Susitna | D | 23rd |
Most reliable counties nationally
The top 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | South Dakota | A | 100th |
| Clearwater County | Minnesota | A | 99th |
| Limestone County | Alabama | A | 99th |
Least reliable counties nationally
The bottom 3 counties nationally by reliability grade and percentile.
| County | State | Grade | National percentile |
|---|---|---|---|
| Clay County | West Virginia | F | 0th |
| Lincoln County | West Virginia | F | 0th |
| Cameron Parish | Louisiana | F | 0th |
FAQ
How often does power go out in Denali?
Between 2016 and 2025, Denali recorded 320 outage events, averaging 3.6 hours each.
What is Denali's reliability grade?
Denali has a Reliability Grade of F, in the 14th national percentile.
What was the worst power outage in Denali?
The worst outage on record started October 9, 2023, lasting 1 hours and affecting up to 1,497 customers.