County annual report · FIPS 30063
2020 Missoula County, MT Power Outage Report
In 2020, customers in Missoula County, MT went without power for an average of 2.6 hours, a total of 148K customer-hours (Montana average 5.6 hours). That ranks 38th worst of 50 Montana counties and 2025th of 3,019 nationally.
Compared with MT, the US and 2019
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Missoula County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | February 1, 2020 20:15 | February 3, 2020 07:45 | 1d 11h | 3,424 | 35K |
| 2 | February 28, 2020 21:00 | February 28, 2020 22:00 | 1h | 2,174 | 2,174 |
| 3 | March 30, 2020 23:30 | March 31, 2020 21:30 | 22h | 2,070 | 13K |
| 4 | October 14, 2020 02:00 | October 14, 2020 08:15 | 6h 15m | 2,013 | 11K |
| 5 | September 14, 2020 14:15 | September 14, 2020 21:45 | 7h 30m | 1,979 | 2,071 |
| 6 | March 18, 2020 15:30 | March 18, 2020 23:15 | 7h 45m | 1,893 | 3,934 |
| 7 | October 15, 2020 10:00 | October 15, 2020 13:15 | 3h 15m | 1,829 | 5,238 |
| 8 | February 27, 2020 17:15 | February 28, 2020 14:15 | 21h | 1,770 | 4,320 |
| 9 | June 7, 2020 21:30 | June 10, 2020 23:15 | 3d 1h | 957 | 15K |
| 10 | December 2, 2020 16:30 | December 3, 2020 04:30 | 12h | 830 | 337 |
Outage episodes by size in 2020: 49 reached 100+ customers, 8 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 2020, 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) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| Missoula Electric Coop, Inc | 2020 | 6.0 hrs | 2.00 | 6.0 hrs | 2.00 |
| 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 2020; 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, 2020, 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/2020/montana/missoula-county