County annual report · FIPS 30045
2021 Judith Basin County, MT Power Outage Report
In 2021, customers in Judith Basin County, MT went without power for an average of 15.3 hours, a total of 15K customer-hours (Montana average 5.0 hours). That ranks 9th worst of 51 Montana counties and 561st 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 Judith Basin 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 | October 7, 2021 02:45 | October 7, 2021 06:00 | 3h 15m | 718 | 1,366 |
| 2 | January 13, 2021 20:30 | January 14, 2021 05:15 | 8h 45m | 558 | 2,250 |
| 3 | January 30, 2021 00:15 | January 30, 2021 05:15 | 5h | 537 | 2,125 |
| 4 | February 22, 2021 03:30 | February 22, 2021 09:15 | 5h 45m | 536 | 3,082 |
| 5 | March 29, 2021 10:45 | March 29, 2021 12:45 | 2h | 536 | 1,072 |
| 6 | January 3, 2021 22:30 | January 4, 2021 00:15 | 1h 45m | 432 | 727 |
| 7 | November 16, 2021 04:00 | November 16, 2021 14:45 | 10h 45m | 218 | 1,147 |
| 8 | July 13, 2021 15:15 | July 13, 2021 23:45 | 8h 30m | 217 | 1,089 |
| 9 | December 11, 2021 19:00 | December 11, 2021 23:45 | 4h 45m | 217 | 1,003 |
| 10 | November 24, 2021 18:00 | November 25, 2021 00:00 | 6h | 104 | 624 |
Outage episodes by size in 2021: 10 reached 100+ customers, 0 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 Judith Basin 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 |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Sun River Electric Coop, Inc | - | - | - | - | - |
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 ÷ 1,006 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. Judith Basin County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Judith Basin 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/judith-basin-county