County annual report · FIPS 30063
2022 Missoula County, MT Power Outage Report
In 2022, customers in Missoula County, MT went without power for an average of 1.6 hours, a total of 90K customer-hours (Montana average 3.5 hours). That ranks 40th worst of 50 Montana counties and 2476th of 2,976 nationally.
Compared with MT, the US and 2021
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Missoula County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 10, 2022 16:15 | November 10, 2022 18:30 | 2h 15m | 3,665 | 8,246 |
| 2 | December 15, 2022 22:00 | December 15, 2022 23:45 | 1h 45m | 3,519 | 5,277 |
| 3 | September 7, 2022 22:30 | September 8, 2022 11:15 | 12h 45m | 2,713 | 5,770 |
| 4 | December 11, 2022 12:15 | December 11, 2022 15:45 | 3h 30m | 2,663 | 8,216 |
| 5 | December 13, 2022 05:30 | December 13, 2022 08:30 | 3h | 2,649 | 7,947 |
| 6 | November 5, 2022 02:00 | November 5, 2022 07:30 | 5h 30m | 2,278 | 1,785 |
| 7 | July 21, 2022 10:00 | July 21, 2022 20:15 | 10h 15m | 1,985 | 2,184 |
| 8 | September 23, 2022 14:45 | September 23, 2022 20:00 | 5h 15m | 1,915 | 2,416 |
| 9 | June 18, 2022 19:00 | June 18, 2022 23:30 | 4h 30m | 1,453 | 6,006 |
| 10 | December 12, 2022 19:00 | December 12, 2022 21:00 | 2h | 1,271 | 2,277 |
Outage episodes by size in 2022: 44 reached 100+ customers, 13 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 Missoula County reported on EIA Form 861 for 2022, 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2022 | 2.2 hrs | 1.14 | 2.0 hrs | 1.09 |
| Missoula Electric Coop, Inc | 2022 | 4.3 hrs | 1.44 | 4.3 hrs | 1.44 |
| Ravalli County Elec Coop, Inc | 2018 | 4.2 hrs | 1.53 | 2.5 hrs | 1.41 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| USBIA-Mission Valley Power | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 76% of Montana's customers in 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 57,348 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. Missoula County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Missoula County, MT annual power outage report, 2022, 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/2022/montana/missoula-county