County annual report · FIPS 30105
2020 Valley County, MT Power Outage Report
In 2020, customers in Valley County, MT went without power for an average of 5.6 hours, a total of 22K customer-hours (Montana average 5.6 hours). That ranks 24th worst of 50 Montana counties and 1295th 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 Valley 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 8, 2020 12:15 | June 12, 2020 01:15 | 3d 13h | 867 | 5,163 |
| 2 | May 21, 2020 21:30 | May 22, 2020 01:15 | 3h 45m | 666 | 1,490 |
| 3 | May 21, 2020 04:00 | May 21, 2020 12:30 | 8h 30m | 628 | 4,657 |
| 4 | July 23, 2020 10:30 | July 23, 2020 14:45 | 4h 15m | 528 | 873 |
| 5 | July 17, 2020 13:45 | July 18, 2020 01:15 | 11h 30m | 481 | 1,010 |
| 6 | July 7, 2020 23:30 | July 8, 2020 07:30 | 8h | 339 | 1,377 |
| 7 | June 4, 2020 16:15 | June 4, 2020 18:00 | 1h 45m | 305 | 534 |
| 8 | July 5, 2020 03:45 | July 6, 2020 17:45 | 1d 14h | 297 | 1,963 |
| 9 | October 7, 2020 13:00 | October 7, 2020 18:00 | 5h | 270 | 1,350 |
| 10 | January 6, 2020 17:45 | January 6, 2020 20:45 | 3h | 261 | 783 |
Outage episodes by size in 2020: 15 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 Valley 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 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| NorVal Electric Cooperative, Inc | - | - | - | - | - |
| Big Flat 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 ÷ 3,912 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. Valley County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Valley 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/valley-county