County annual report · FIPS 30057
2022 Madison County, MT Power Outage Report
In 2022, customers in Madison County, MT went without power for an average of 9.8 hours, a total of 61K customer-hours (Montana average 3.5 hours). That ranks 9th worst of 50 Montana counties and 743rd of 2,976 nationally.
Compared with MT, the US and 2021
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Madison County, 2022
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 28, 2022 14:00 | June 29, 2022 06:00 | 16h | 1,863 | 3,282 |
| 2 | August 24, 2022 17:15 | August 24, 2022 23:00 | 5h 45m | 1,665 | 4,400 |
| 3 | December 21, 2022 13:45 | December 21, 2022 22:30 | 8h 45m | 1,163 | 5,280 |
| 4 | June 13, 2022 14:15 | June 13, 2022 18:15 | 4h | 1,155 | 2,606 |
| 5 | September 7, 2022 20:15 | September 8, 2022 04:00 | 7h 45m | 1,085 | 4,746 |
| 6 | September 29, 2022 22:15 | September 30, 2022 10:45 | 12h 30m | 864 | 3,939 |
| 7 | July 26, 2022 15:30 | July 26, 2022 21:00 | 5h 30m | 685 | 1,971 |
| 8 | October 24, 2022 11:15 | October 24, 2022 20:45 | 9h 30m | 651 | 2,105 |
| 9 | September 30, 2022 16:15 | September 30, 2022 22:00 | 5h 45m | 571 | 2,896 |
| 10 | February 8, 2022 00:30 | February 8, 2022 03:45 | 3h 15m | 567 | 1,702 |
Outage episodes by size in 2022: 30 reached 100+ customers, 5 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 Madison County reported on EIA Form 861 for 2022, 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) | 2022 | 2.2 hrs | 1.14 | 2.0 hrs | 1.09 |
| 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 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 6,199 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. Madison County has data for 2018–2025.
Cite this report
MassOutage (massoutage.com), Madison County, MT annual power outage report, 2022, 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/2022/montana/madison-county