County annual report · FIPS 02020
2021 Anchorage Municipality, AK Power Outage Report
In 2021, customers in Anchorage Municipality, AK went without power for an average of 2.5 hours, a total of 278K customer-hours (Alaska average 7.0 hours). That ranks 6th worst of 7 Alaska counties and 2028th of 2,974 nationally.
Compared with AK, the US and 2020
Coverage line is EAGLE-I's share of Alaska customers tracked each year.
Biggest outages in Anchorage Municipality, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 2, 2021 09:45 | December 2, 2021 11:30 | 1h 45m | 11,496 | 5,749 |
| 2 | September 22, 2021 13:30 | September 26, 2021 08:30 | 3d 19h | 6,413 | 65K |
| 3 | April 30, 2021 05:45 | April 30, 2021 19:30 | 13h 45m | 4,098 | 5,348 |
| 4 | October 6, 2021 11:15 | October 7, 2021 13:45 | 1d 2h | 2,882 | 12K |
| 5 | September 7, 2021 04:45 | September 8, 2021 00:30 | 19h 45m | 2,576 | 7,007 |
| 6 | October 22, 2021 07:00 | October 22, 2021 14:15 | 7h 15m | 2,548 | 8,260 |
| 7 | May 20, 2021 16:45 | May 22, 2021 15:30 | 1d 22h | 2,186 | 3,327 |
| 8 | September 13, 2021 05:45 | September 13, 2021 19:00 | 13h 15m | 1,945 | 5,458 |
| 9 | September 28, 2021 11:15 | September 29, 2021 05:30 | 18h 15m | 1,859 | 516 |
| 10 | July 9, 2021 17:30 | July 10, 2021 05:00 | 11h 30m | 1,749 | 1,154 |
Outage episodes by size in 2021: 107 reached 100+ customers, 23 reached 1,000+ customers, 1 reached 10,000+ customers.
Utility reliability filed with the EIA
SAIDI (average outage time per customer) and SAIFI (average interruptions per customer) that utilities serving Anchorage Municipality reported on EIA Form 861 for 2021, or their most recent earlier filing. Utility-wide figures, not county-specific.
| Utility | EIA year | SAIDI | SAIFI | SAIDI excl. major events | SAIFI excl. major events |
|---|---|---|---|---|---|
| Chugach Electric Assn Inc | 2020 | 1.9 hrs | 0.86 | - | - |
| Matanuska Electric Assn Inc | 2021 | 6.8 hrs | 2.04 | 4.0 hrs | 1.53 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 68% of Alaska's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 110,430 customers (ORNL modeled county customer count), including major storm days. It is comparable across counties but is not the SAIDI a utility files.
- An outage event is a continuous stretch with customers out; counts at 100, 1,000 and 10,000+ use its peak.
- Years loaded: 2015–2025. Anchorage Municipality has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Anchorage Municipality, AK annual power outage report, 2021, data as of Oct 3, 2026 02:41 UTC, sources: DOE EAGLE-I (https://eagle-i.doe.gov/); EAGLE-I modeled customer counts (MCC) (https://figshare.com/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/alaska/anchorage-municipality