County annual report · FIPS 30023
2021 Deer Lodge County, MT Power Outage Report
In 2021, customers in Deer Lodge County, MT went without power for an average of 3.9 hours, a total of 26K customer-hours (Montana average 5.0 hours). That ranks 28th worst of 51 Montana counties and 1577th of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Deer Lodge County, 2021
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 12, 2021 19:45 | January 14, 2021 16:30 | 1d 20h | 1,679 | 5,802 |
| 2 | December 5, 2021 04:15 | December 5, 2021 09:15 | 5h | 1,402 | 4,220 |
| 3 | September 20, 2021 20:45 | September 21, 2021 06:30 | 9h 45m | 1,330 | 2,045 |
| 4 | March 9, 2021 02:30 | March 9, 2021 03:30 | 1h | 1,305 | 1,305 |
| 5 | March 6, 2021 23:00 | March 7, 2021 02:15 | 3h 15m | 645 | 1,369 |
| 6 | March 29, 2021 08:15 | March 30, 2021 20:15 | 1d 12h | 638 | 2,040 |
| 7 | August 28, 2021 04:30 | August 28, 2021 07:00 | 2h 30m | 496 | 1,190 |
| 8 | July 20, 2021 05:00 | July 20, 2021 05:45 | 45m | 483 | 316 |
| 9 | May 26, 2021 23:15 | May 27, 2021 04:00 | 4h 45m | 328 | 112 |
| 10 | June 3, 2021 03:30 | June 3, 2021 16:00 | 12h 30m | 291 | 323 |
Outage episodes by size in 2021: 16 reached 100+ customers, 4 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 Deer Lodge County reported on EIA Form 861 for 2021, 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) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| Bonneville Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| Vigilante 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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 6,663 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. Deer Lodge County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Deer Lodge County, MT annual power outage report, 2021, 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/2021/montana/deer-lodge-county