County annual report · FIPS 30077
2020 Powell County, MT Power Outage Report
In 2020, customers in Powell County, MT went without power for an average of 14.4 hours, a total of 65K customer-hours (Montana average 5.6 hours). That ranks 8th worst of 50 Montana counties and 577th of 3,019 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Powell 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 6, 2020 13:45 | June 6, 2020 21:30 | 7h 45m | 1,982 | 3,437 |
| 2 | June 8, 2020 09:15 | June 10, 2020 23:30 | 2d 14h | 1,916 | 37K |
| 3 | November 12, 2020 18:15 | November 12, 2020 20:45 | 2h 30m | 918 | 2,295 |
| 4 | June 24, 2020 23:15 | June 30, 2020 06:00 | 5d 6h | 513 | 1,181 |
| 5 | June 30, 2020 17:00 | June 30, 2020 22:30 | 5h 30m | 392 | 1,269 |
| 6 | October 17, 2020 22:45 | October 18, 2020 00:15 | 1h 30m | 351 | 527 |
| 7 | September 10, 2020 21:00 | September 11, 2020 03:15 | 6h 15m | 341 | 976 |
| 8 | October 26, 2020 04:30 | October 28, 2020 18:30 | 2d 14h | 300 | 10K |
| 9 | January 2, 2020 20:15 | January 3, 2020 02:30 | 6h 15m | 180 | 491 |
| 10 | June 14, 2020 16:15 | June 15, 2020 00:30 | 8h 15m | 168 | 476 |
Outage episodes by size in 2020: 15 reached 100+ customers, 2 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 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 |
| Missoula Electric Coop, Inc | 2020 | 6.0 hrs | 2.00 | 6.0 hrs | 2.00 |
| 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 76% of Montana's customers in 2020; 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, 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/powell-county