County annual report · FIPS 02170
2021 Matanuska-Susitna Borough, AK Power Outage Report
In 2021, customers in Matanuska-Susitna Borough, AK went without power for an average of 8.5 hours, a total of 510K customer-hours (Alaska average 7.0 hours). That ranks 4th worst of 7 Alaska counties and 894th 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 Matanuska-Susitna Borough, 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 | October 29, 2021 16:30 | November 1, 2021 13:00 | 2d 20h | 8,286 | 129K |
| 2 | September 23, 2021 17:45 | September 27, 2021 09:00 | 3d 15h | 7,675 | 62K |
| 3 | January 18, 2021 17:45 | January 18, 2021 23:30 | 5h 45m | 6,146 | 7,829 |
| 4 | September 20, 2021 19:45 | September 22, 2021 13:30 | 1d 17h | 5,920 | 86K |
| 5 | March 12, 2021 19:00 | March 12, 2021 20:00 | 1h | 5,677 | 4,258 |
| 6 | July 24, 2021 19:30 | July 24, 2021 23:00 | 3h 30m | 4,359 | 11K |
| 7 | September 13, 2021 00:45 | September 14, 2021 01:15 | 1d | 3,461 | 8,362 |
| 8 | July 18, 2021 19:30 | July 19, 2021 11:00 | 15h 30m | 3,289 | 14K |
| 9 | December 28, 2021 08:00 | December 28, 2021 15:00 | 7h | 3,015 | 7,436 |
| 10 | December 28, 2021 23:30 | December 30, 2021 13:30 | 1d 14h | 2,285 | 6,913 |
Outage episodes by size in 2021: 124 reached 100+ customers, 33 reached 1,000+ customers, 0 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 Matanuska-Susitna Borough 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 |
|---|---|---|---|---|---|
| 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 ÷ 59,763 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. Matanuska-Susitna Borough has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Matanuska-Susitna Borough, 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/matanuska-susitna-borough