County annual report · FIPS 30057
2023 Madison County, MT Power Outage Report
In 2023, customers in Madison County, MT went without power for an average of 5.4 hours, a total of 34K customer-hours (Montana average 1.8 hours). That ranks 9th worst of 50 Montana counties and 1390th 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 Madison 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 27, 2023 21:00 | April 27, 2023 23:45 | 2h 45m | 1,171 | 3,220 |
| 2 | March 10, 2023 23:45 | March 11, 2023 05:15 | 5h 30m | 895 | 2,611 |
| 3 | March 8, 2023 10:15 | March 9, 2023 07:15 | 21h | 663 | 3,914 |
| 4 | May 3, 2023 16:30 | May 4, 2023 05:45 | 13h 15m | 662 | 3,385 |
| 5 | July 1, 2023 16:45 | July 2, 2023 07:15 | 14h 30m | 636 | 5,203 |
| 6 | February 19, 2023 19:45 | February 20, 2023 08:00 | 12h 15m | 550 | 1,757 |
| 7 | April 10, 2023 23:15 | April 11, 2023 10:45 | 11h 30m | 550 | 1,911 |
| 8 | December 7, 2023 06:15 | December 7, 2023 08:00 | 1h 45m | 220 | 330 |
| 9 | December 4, 2023 06:30 | December 4, 2023 11:45 | 5h 15m | 204 | 537 |
| 10 | February 21, 2023 13:00 | February 21, 2023 22:00 | 9h | 149 | 255 |
Outage episodes by size in 2023: 18 reached 100+ customers, 1 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 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 |
| 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 n/a of Montana's customers in 2023; 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, 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/madison-county