County annual report · FIPS 30105
2023 Valley County, MT Power Outage Report
In 2023, customers in Valley County, MT went without power for an average of 1.6 hours, a total of 6,341 customer-hours (Montana average 1.8 hours). That ranks 29th worst of 50 Montana counties and 2442nd of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Valley County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 13, 2023 18:45 | January 13, 2023 23:45 | 5h | 334 | 1,670 |
| 2 | January 12, 2023 21:30 | January 12, 2023 23:00 | 1h 30m | 306 | 458 |
| 3 | February 16, 2023 05:45 | February 16, 2023 13:45 | 8h | 262 | 2,090 |
| 4 | December 22, 2023 15:15 | December 22, 2023 16:45 | 1h 30m | 259 | 389 |
| 5 | January 4, 2023 19:15 | January 4, 2023 22:00 | 2h 45m | 211 | 374 |
| 6 | March 21, 2023 10:00 | March 21, 2023 12:45 | 2h 45m | 175 | 352 |
| 7 | June 10, 2023 10:15 | June 10, 2023 12:30 | 2h 15m | 175 | 308 |
| 8 | January 27, 2023 00:00 | January 27, 2023 06:30 | 6h 30m | 59 | 237 |
| 9 | March 13, 2023 23:45 | March 14, 2023 00:45 | 1h | 32 | 31 |
| 10 | April 22, 2023 23:00 | April 23, 2023 02:15 | 3h 15m | 28 | 31 |
Outage episodes by size in 2023: 7 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| 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 n/a of Montana's customers in 2023; 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, 2023, 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/2023/montana/valley-county