Anchorage Power Outage History
2017–2025 · Alaska
Average — typical outage frequency and duration nationally. How grades are calculated
Outages by year
Outages by month (seasonality)
Worst outage events on record
| Date | Duration | Customers affected | Cause |
|---|---|---|---|
| May 14, 2023 | 12 hrs | 66,516 (60%) | Unnamed event |
| Sep 1, 2023 | 12 hrs | 64,266 (58%) | Unnamed event |
| Aug 13, 2024 | 2 hrs | 47,945 (43%) | Unnamed event |
| Aug 24, 2023 | 3 hrs | 31,512 (28%) | Unnamed event |
| Jan 12, 2025 | 68 hrs | 29,805 (27%) | Unnamed event |
Over the 9 years from 2017 to 2025, Anchorage recorded 920 distinct power outage events, averaging 2.6 hours per event.
The single worst outage on record in Anchorage started May 14, 2023, lasting 12 hours and leaving up to 66,516 customers without power (60% of the county) at its peak.
August has historically been the worst month for outages in Anchorage, with 133 events recorded during that month across the dataset.
Based on this history, Anchorage earns a Reliability Grade of C, placing it in the 59th percentile nationally for grid reliability (higher percentile = more reliable).
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Similar counties in Alaska
Counties with the closest reliability grade and national percentile to Anchorage.
| County | Grade | National percentile |
|---|---|---|
| Fairbanks North Star | D | 33rd |
| Yukon-Koyukuk | A | 88th |
| Kenai Peninsula | D | 27th |
| Matanuska-Susitna | D | 23rd |
| Southeast Fairbanks | D | 23rd |
FAQ
How often does power go out in Anchorage?
Between 2017 and 2025, Anchorage recorded 920 outage events, averaging 2.6 hours each.
What is Anchorage's reliability grade?
Anchorage has a Reliability Grade of C, in the 59th national percentile.
What was the worst power outage in Anchorage?
The worst outage on record started May 14, 2023, lasting 12 hours and affecting up to 66,516 customers.