County annual report · FIPS 30043
2024 Jefferson County, MT Power Outage Report
In 2024, customers in Jefferson County, MT went without power for an average of 8.8 hours, a total of 47K customer-hours (Montana average 8.5 hours). That ranks 16th worst of 51 Montana counties and 1033rd 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 Jefferson 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 | May 14, 2024 12:30 | May 14, 2024 18:30 | 6h | 2,681 | 12K |
| 2 | November 13, 2024 06:15 | November 13, 2024 09:45 | 3h 30m | 1,484 | 5,194 |
| 3 | August 28, 2024 19:45 | August 28, 2024 20:45 | 1h | 1,479 | 1,479 |
| 4 | August 2, 2024 15:45 | August 2, 2024 19:30 | 3h 45m | 1,429 | 3,925 |
| 5 | October 22, 2024 15:30 | October 22, 2024 15:45 | 15m | 1,287 | 322 |
| 6 | July 7, 2024 20:00 | July 8, 2024 01:30 | 5h 30m | 635 | 2,922 |
| 7 | July 25, 2024 13:00 | July 25, 2024 19:00 | 6h | 597 | 3,270 |
| 8 | August 1, 2024 13:30 | August 1, 2024 19:45 | 6h 15m | 580 | 1,820 |
| 9 | May 23, 2024 14:15 | May 24, 2024 00:15 | 10h | 413 | 2,257 |
| 10 | May 8, 2024 10:45 | May 9, 2024 18:45 | 1d 8h | 312 | 2,270 |
Outage episodes by size in 2024: 25 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 Jefferson 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 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| Vigilante 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 n/a of Montana's customers in 2024; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 5,322 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. Jefferson County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Jefferson 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/jefferson-county