County annual report · FIPS 30037
2025 Golden Valley County, MT Power Outage Report
In 2025, customers in Golden Valley County, MT went without power for an average of 24.4 hours, a total of 7,699 customer-hours (Montana average 6.8 hours). That ranks 6th worst of 51 Montana counties and 262nd 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 Golden Valley 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 | September 4, 2025 21:00 | September 5, 2025 01:00 | 4h | 512 | 1,929 |
| 2 | September 6, 2025 21:45 | September 6, 2025 23:15 | 1h 30m | 512 | 696 |
| 3 | August 29, 2025 22:45 | August 30, 2025 00:15 | 1h 30m | 472 | 690 |
| 4 | September 9, 2025 00:15 | September 9, 2025 04:15 | 4h | 320 | 1,129 |
| 5 | September 8, 2025 18:30 | September 8, 2025 19:45 | 1h 15m | 293 | 293 |
| 6 | September 4, 2025 16:00 | September 4, 2025 18:45 | 2h 45m | 259 | 648 |
| 7 | September 13, 2025 20:45 | September 14, 2025 00:15 | 3h 30m | 124 | 434 |
| 8 | April 28, 2025 12:30 | April 28, 2025 15:30 | 3h | 102 | 297 |
| 9 | April 30, 2025 03:45 | April 30, 2025 06:30 | 2h 45m | 102 | 157 |
| 10 | July 22, 2025 05:00 | July 22, 2025 10:15 | 5h 15m | 102 | 259 |
Outage episodes by size in 2025: 10 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 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 |
| 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 n/a of Montana's customers in 2025; 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, 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/golden-valley-county