County annual report · FIPS 30093
2023 Silver Bow County, MT Power Outage Report
In 2023, customers in Silver Bow County, MT went without power for an average of 0.9 hours, a total of 22K customer-hours (Montana average 1.8 hours). That ranks 37th worst of 50 Montana counties and 2698th of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Silver Bow County, 2023
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 16, 2023 21:00 | February 16, 2023 23:00 | 2h | 4,064 | 2,543 |
| 2 | August 20, 2023 00:15 | August 20, 2023 02:45 | 2h 30m | 1,376 | 3,116 |
| 3 | May 6, 2023 22:30 | May 7, 2023 02:30 | 4h | 868 | 1,088 |
| 4 | May 7, 2023 03:15 | May 7, 2023 04:15 | 1h | 868 | 868 |
| 5 | June 25, 2023 17:45 | June 25, 2023 20:45 | 3h | 827 | 2,479 |
| 6 | August 18, 2023 21:15 | August 18, 2023 23:00 | 1h 45m | 670 | 826 |
| 7 | February 21, 2023 04:00 | February 21, 2023 14:45 | 10h 45m | 652 | 1,716 |
| 8 | April 25, 2023 00:30 | April 25, 2023 03:45 | 3h 15m | 481 | 606 |
| 9 | December 20, 2023 21:15 | December 21, 2023 01:15 | 4h | 319 | 832 |
| 10 | July 10, 2023 22:00 | July 11, 2023 05:45 | 7h 45m | 279 | 1,811 |
Outage episodes by size in 2023: 19 reached 100+ customers, 2 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| 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 2023; 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, 2023, 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/2023/montana/silver-bow-county