County annual report · FIPS 30063
2024 Missoula County, MT Power Outage Report
In 2024, customers in Missoula County, MT went without power for an average of 38.6 hours, a total of 2.2M customer-hours (Montana average 8.5 hours). That ranks 2nd worst of 51 Montana counties and 251st of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Missoula County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 24, 2024 05:15 | August 5, 2024 16:15 | 12d 11h | 55,225 | 1.9M |
| 2 | October 23, 2024 17:15 | October 23, 2024 22:30 | 5h 15m | 4,625 | 6,935 |
| 3 | August 18, 2024 13:00 | August 18, 2024 15:15 | 2h 15m | 4,205 | 5,121 |
| 4 | August 23, 2024 22:15 | August 29, 2024 02:45 | 5d 4h | 4,181 | 108K |
| 5 | November 8, 2024 22:30 | November 9, 2024 06:00 | 7h 30m | 3,991 | 8,636 |
| 6 | May 24, 2024 13:30 | May 24, 2024 13:45 | 15m | 3,498 | 875 |
| 7 | May 6, 2024 14:00 | May 6, 2024 14:15 | 15m | 2,837 | 709 |
| 8 | October 4, 2024 22:00 | October 10, 2024 15:00 | 5d 17h | 2,109 | 20K |
| 9 | November 4, 2024 20:45 | November 5, 2024 02:45 | 6h | 2,099 | 5,218 |
| 10 | October 22, 2024 09:00 | October 22, 2024 23:45 | 14h 45m | 2,090 | 9,036 |
Outage episodes by size in 2024: 66 reached 100+ customers, 21 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 Missoula County reported on EIA Form 861 for 2024, 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) | 2024 | 3.9 hrs | 1.30 | 2.0 hrs | 0.95 |
| Missoula Electric Coop, Inc | 2024 | 26.8 hrs | 3.59 | 8.4 hrs | 2.19 |
| 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 n/a of Montana's customers in 2024; 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, 2024, 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/2024/montana/missoula-county