County annual report · FIPS 30057
2025 Madison County, MT Power Outage Report
In 2025, customers in Madison County, MT went without power for an average of 12.2 hours, a total of 76K customer-hours (Montana average 6.8 hours). That ranks 13th worst of 51 Montana counties and 640th of 3,000 nationally.
Compared with MT, the US and 2024
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Madison County, 2025
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 16, 2025 08:45 | September 16, 2025 17:00 | 8h 15m | 1,953 | 7,338 |
| 2 | December 17, 2025 16:15 | December 19, 2025 04:45 | 1d 12h | 1,688 | 8,134 |
| 3 | September 15, 2025 05:45 | September 15, 2025 19:15 | 13h 30m | 1,281 | 4,329 |
| 4 | February 7, 2025 23:45 | February 8, 2025 07:15 | 7h 30m | 1,222 | 7,069 |
| 5 | March 30, 2025 07:45 | March 30, 2025 21:15 | 13h 30m | 1,078 | 4,687 |
| 6 | May 5, 2025 10:45 | May 5, 2025 16:30 | 5h 45m | 882 | 5,066 |
| 7 | January 27, 2025 22:15 | January 28, 2025 00:30 | 2h 15m | 789 | 1,726 |
| 8 | January 18, 2025 13:45 | January 18, 2025 20:15 | 6h 30m | 720 | 1,794 |
| 9 | January 16, 2025 00:00 | January 16, 2025 01:45 | 1h 45m | 666 | 428 |
| 10 | July 8, 2025 01:00 | July 8, 2025 23:15 | 22h 15m | 616 | 2,670 |
Outage episodes by size in 2025: 28 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 2025, 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 2025; 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, 2025, 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/2025/montana/madison-county