County annual report · FIPS 30031
2021 Gallatin County, MT Power Outage Report
In 2021, customers in Gallatin County, MT went without power for an average of 2.2 hours, a total of 213K customer-hours (Montana average 5.0 hours). That ranks 34th worst of 51 Montana counties and 2148th 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 Gallatin 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 | September 15, 2021 13:30 | September 15, 2021 20:00 | 6h 30m | 9,419 | 18K |
| 2 | October 11, 2021 12:45 | October 12, 2021 02:45 | 14h | 6,262 | 28K |
| 3 | January 30, 2021 11:15 | January 31, 2021 06:45 | 19h 30m | 5,455 | 30K |
| 4 | February 12, 2021 01:15 | February 12, 2021 08:00 | 6h 45m | 5,420 | 15K |
| 5 | July 22, 2021 05:30 | July 22, 2021 08:15 | 2h 45m | 2,243 | 6,166 |
| 6 | February 12, 2021 12:45 | February 12, 2021 20:45 | 8h | 1,916 | 5,897 |
| 7 | January 12, 2021 23:45 | January 15, 2021 05:15 | 2d 5h | 1,748 | 26K |
| 8 | August 17, 2021 22:15 | August 18, 2021 11:15 | 13h | 1,715 | 6,440 |
| 9 | October 26, 2021 04:45 | October 26, 2021 07:00 | 2h 15m | 1,469 | 3,305 |
| 10 | June 8, 2021 06:30 | June 8, 2021 11:45 | 5h 15m | 1,337 | 2,501 |
Outage episodes by size in 2021: 69 reached 100+ customers, 12 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 Gallatin 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 |
| Fall River Rural Elec Coop Inc | 2021 | 71 min | 0.61 | 57 min | 0.50 |
| NorthWestern Energy | - | - | - | - | - |
| Vigilante Electric Coop, Inc | - | - | - | - | - |
| Park 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 ÷ 96,603 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. Gallatin County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Gallatin 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/gallatin-county