County annual report · FIPS 30057
2024 Madison County, MT Power Outage Report
In 2024, customers in Madison County, MT went without power for an average of 14.0 hours, a total of 87K customer-hours (Montana average 8.5 hours). That ranks 8th worst of 51 Montana counties and 696th of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Madison County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 5, 2024 22:45 | September 11, 2024 18:45 | 5d 20h | 3,687 | 7,707 |
| 2 | July 27, 2024 20:30 | July 28, 2024 01:30 | 5h | 1,221 | 3,682 |
| 3 | May 4, 2024 22:15 | May 5, 2024 03:00 | 4h 45m | 1,213 | 5,762 |
| 4 | July 24, 2024 19:15 | July 24, 2024 21:45 | 2h 30m | 1,164 | 1,340 |
| 5 | April 18, 2024 19:30 | April 19, 2024 04:00 | 8h 30m | 1,163 | 3,708 |
| 6 | May 17, 2024 15:30 | May 17, 2024 23:15 | 7h 45m | 1,160 | 3,918 |
| 7 | June 19, 2024 16:00 | June 20, 2024 00:00 | 8h | 1,137 | 3,299 |
| 8 | August 3, 2024 15:15 | August 4, 2024 11:00 | 19h 45m | 768 | 6,642 |
| 9 | July 28, 2024 21:45 | July 29, 2024 01:00 | 3h 15m | 765 | 2,486 |
| 10 | May 23, 2024 11:15 | May 24, 2024 00:15 | 13h | 751 | 4,734 |
Outage episodes by size in 2024: 35 reached 100+ customers, 7 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 2024, 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) | 2024 | 3.9 hrs | 1.30 | 2.0 hrs | 0.95 |
| 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 2024; 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, 2024, 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/2024/montana/madison-county