County annual report · FIPS 30093
2020 Silver Bow County, MT Power Outage Report
In 2020, customers in Silver Bow County, MT went without power for an average of 4.9 hours, a total of 119K customer-hours (Montana average 5.6 hours). That ranks 26th worst of 50 Montana counties and 1409th of 3,019 nationally.
Compared with MT, the US and 2019
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Silver Bow County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 13, 2020 18:00 | June 14, 2020 11:30 | 17h 30m | 7,121 | 17K |
| 2 | May 28, 2020 23:45 | May 29, 2020 04:00 | 4h 15m | 6,874 | 11K |
| 3 | December 8, 2020 17:00 | December 8, 2020 20:30 | 3h 30m | 2,386 | 4,365 |
| 4 | November 24, 2020 06:45 | November 24, 2020 12:30 | 5h 45m | 2,029 | 11K |
| 5 | June 12, 2020 22:30 | June 13, 2020 01:15 | 2h 45m | 1,982 | 3,469 |
| 6 | June 17, 2020 00:30 | June 17, 2020 06:30 | 6h | 1,482 | 3,712 |
| 7 | March 10, 2020 15:15 | March 10, 2020 23:00 | 7h 45m | 1,468 | 1,570 |
| 8 | October 19, 2020 05:30 | October 19, 2020 08:15 | 2h 45m | 1,132 | 3,113 |
| 9 | September 2, 2020 07:15 | September 2, 2020 23:15 | 16h | 1,091 | 6,396 |
| 10 | August 12, 2020 14:15 | August 12, 2020 23:45 | 9h 30m | 1,048 | 525 |
Outage episodes by size in 2020: 31 reached 100+ customers, 10 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 2020, 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) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| 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 76% of Montana's customers in 2020; 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, 2020, 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/2020/montana/silver-bow-county