County annual report · FIPS 30077
2023 Powell County, MT Power Outage Report
In 2023, customers in Powell County, MT went without power for an average of 1.5 hours, a total of 6,741 customer-hours (Montana average 1.8 hours). That ranks 33rd worst of 50 Montana counties and 2495th 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 Powell 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 | April 11, 2023 10:15 | April 11, 2023 14:15 | 4h | 792 | 2,114 |
| 2 | February 23, 2023 11:00 | February 23, 2023 20:00 | 9h | 177 | 625 |
| 3 | January 27, 2023 17:15 | January 27, 2023 20:00 | 2h 45m | 143 | 358 |
| 4 | September 4, 2023 14:00 | September 4, 2023 16:45 | 2h 45m | 122 | 268 |
| 5 | September 23, 2023 11:15 | September 23, 2023 14:45 | 3h 30m | 91 | 234 |
| 6 | August 6, 2023 01:15 | August 6, 2023 03:00 | 1h 45m | 62 | 81 |
| 7 | April 16, 2023 19:45 | April 17, 2023 01:45 | 6h | 55 | 299 |
| 8 | September 27, 2023 04:30 | September 27, 2023 07:30 | 3h | 55 | 102 |
| 9 | September 21, 2023 14:30 | September 22, 2023 01:45 | 11h 15m | 48 | 386 |
| 10 | September 14, 2023 19:15 | September 14, 2023 22:45 | 3h 30m | 47 | 165 |
Outage episodes by size in 2023: 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 Powell 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 |
| Missoula Electric Coop, Inc | 2023 | 2.8 hrs | 1.19 | 2.8 hrs | 1.19 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
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 ÷ 4,506 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. Powell County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Powell 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/powell-county