County annual report · FIPS 30081
2021 Ravalli County, MT Power Outage Report
In 2021, customers in Ravalli County, MT went without power for an average of 1.6 hours, a total of 40K customer-hours (Montana average 5.0 hours). That ranks 40th worst of 51 Montana counties and 2412th of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Ravalli County, 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 | August 17, 2021 14:45 | August 17, 2021 21:30 | 6h 45m | 2,458 | 13K |
| 2 | February 18, 2021 19:00 | February 18, 2021 22:00 | 3h | 1,762 | 1,324 |
| 3 | March 4, 2021 19:45 | March 4, 2021 21:45 | 2h | 1,696 | 564 |
| 4 | September 18, 2021 17:30 | September 19, 2021 07:00 | 13h 30m | 1,182 | 6,539 |
| 5 | January 10, 2021 17:15 | January 10, 2021 18:45 | 1h 30m | 1,021 | 1,021 |
| 6 | July 27, 2021 13:45 | July 27, 2021 21:45 | 8h | 712 | 1,093 |
| 7 | August 9, 2021 00:45 | August 9, 2021 03:45 | 3h | 678 | 1,751 |
| 8 | December 23, 2021 23:00 | December 24, 2021 04:00 | 5h | 589 | 880 |
| 9 | February 8, 2021 11:30 | February 8, 2021 13:15 | 1h 45m | 545 | 818 |
| 10 | March 28, 2021 21:15 | March 29, 2021 00:15 | 3h | 470 | 1,312 |
Outage episodes by size in 2021: 20 reached 100+ customers, 5 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 Ravalli County 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| Missoula Electric Coop, Inc | 2021 | 12.7 hrs | 3.21 | 6.5 hrs | 2.76 |
| Ravalli County Elec Coop, Inc | 2018 | 4.2 hrs | 1.53 | 2.5 hrs | 1.41 |
| NorthWestern Energy | - | - | - | - | - |
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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 25,043 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. Ravalli County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Ravalli County, MT 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/montana/ravalli-county