County annual report · FIPS 30037
2021 Golden Valley County, MT Power Outage Report
In 2021, customers in Golden Valley County, MT went without power for an average of 16.8 hours, a total of 5,305 customer-hours (Montana average 5.0 hours). That ranks 6th worst of 51 Montana counties and 505th 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 Golden Valley 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 | June 15, 2021 00:15 | June 15, 2021 03:15 | 3h | 591 | 1,669 |
| 2 | August 27, 2021 12:30 | August 27, 2021 15:15 | 2h 45m | 546 | 996 |
| 3 | May 8, 2021 11:30 | May 8, 2021 19:30 | 8h | 182 | 608 |
| 4 | February 17, 2021 15:45 | February 17, 2021 17:45 | 2h | 116 | 160 |
| 5 | January 13, 2021 23:00 | January 16, 2021 05:30 | 2d 6h | 59 | 894 |
| 6 | June 4, 2021 16:15 | June 4, 2021 18:45 | 2h 30m | 56 | 136 |
| 7 | August 27, 2021 17:45 | August 27, 2021 18:30 | 45m | 54 | 41 |
| 8 | March 5, 2021 00:15 | March 5, 2021 11:30 | 11h 15m | 30 | 312 |
| 9 | February 12, 2021 01:15 | February 12, 2021 04:30 | 3h 15m | 26 | 65 |
| 10 | August 9, 2021 23:15 | August 10, 2021 00:30 | 1h 15m | 26 | 33 |
Outage episodes by size in 2021: 4 reached 100+ customers, 0 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 Golden Valley 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 |
| Fergus 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 ÷ 316 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. Golden Valley County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Golden Valley 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/golden-valley-county