County annual report · FIPS 30061
2021 Mineral County, MT Power Outage Report
In 2021, customers in Mineral County, MT went without power for an average of 47.2 hours, a total of 116K customer-hours (Montana average 5.0 hours). That ranks 2nd worst of 51 Montana counties and 191st 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 Mineral 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 | February 26, 2021 12:15 | February 27, 2021 11:15 | 23h | 3,207 | 18K |
| 2 | January 13, 2021 14:30 | January 18, 2021 01:00 | 4d 10h | 2,260 | 47K |
| 3 | November 16, 2021 00:30 | November 18, 2021 01:15 | 2d | 2,247 | 22K |
| 4 | August 2, 2021 20:30 | August 3, 2021 03:00 | 6h 30m | 2,197 | 11K |
| 5 | June 14, 2021 04:45 | June 14, 2021 06:45 | 2h | 1,821 | 2,227 |
| 6 | April 20, 2021 23:00 | April 21, 2021 00:15 | 1h 15m | 1,170 | 1,170 |
| 7 | May 2, 2021 20:00 | May 3, 2021 03:00 | 7h | 705 | 2,174 |
| 8 | December 14, 2021 10:00 | December 15, 2021 00:30 | 14h 30m | 557 | 3,972 |
| 9 | December 21, 2021 03:15 | December 21, 2021 16:15 | 13h | 554 | 3,446 |
| 10 | August 1, 2021 22:15 | August 2, 2021 03:45 | 5h 30m | 414 | 1,361 |
Outage episodes by size in 2021: 15 reached 100+ customers, 6 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 Mineral 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 |
| Bonneville Power Administration | - | - | - | - | - |
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 ÷ 2,455 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. Mineral County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Mineral 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/mineral-county