County annual report · FIPS 30093
2025 Silver Bow County, MT Power Outage Report
In 2025, customers in Silver Bow County, MT went without power for an average of 2.6 hours, a total of 62K customer-hours (Montana average 6.8 hours). That ranks 37th worst of 51 Montana counties and 2214th of 3,000 nationally.
Compared with MT, the US and 2024
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Silver Bow County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 17, 2025 15:45 | December 24, 2025 00:30 | 6d 8h | 6,355 | 33K |
| 2 | May 29, 2025 23:15 | May 30, 2025 01:00 | 1h 45m | 1,975 | 3,030 |
| 3 | August 6, 2025 17:30 | August 6, 2025 18:30 | 1h | 1,106 | 1,106 |
| 4 | September 20, 2025 23:45 | September 21, 2025 00:30 | 45m | 860 | 645 |
| 5 | July 10, 2025 01:15 | July 10, 2025 06:00 | 4h 45m | 853 | 1,407 |
| 6 | May 13, 2025 16:45 | May 13, 2025 17:45 | 1h | 690 | 690 |
| 7 | January 13, 2025 18:15 | January 13, 2025 21:00 | 2h 45m | 685 | 1,884 |
| 8 | March 13, 2025 19:00 | March 14, 2025 00:45 | 5h 45m | 590 | 1,563 |
| 9 | September 7, 2025 00:15 | September 7, 2025 03:45 | 3h 30m | 214 | 222 |
| 10 | December 16, 2025 09:00 | December 16, 2025 11:45 | 2h 45m | 175 | 481 |
Outage episodes by size in 2025: 17 reached 100+ customers, 3 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 Silver Bow County reported on EIA Form 861 for 2025, 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 2025; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 24,074 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. Silver Bow County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Silver Bow County, MT annual power outage report, 2025, 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/2025/montana/silver-bow-county