County annual report · FIPS 30057
2019 Madison County, MT Power Outage Report
In 2019, customers in Madison County, MT went without power for an average of 0.0 hours, a total of 98 customer-hours (Montana average 0.6 hours). That ranks 24th worst of 38 Montana counties and 2880th of 2,945 nationally.
Compared with MT, the US and 2018
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Madison County, 2019
The 6 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 25, 2019 19:30 | December 25, 2019 23:00 | 3h 30m | 29 | 74 |
| 2 | December 25, 2019 01:15 | December 25, 2019 03:15 | 2h | 7 | 11 |
| 3 | May 13, 2019 21:00 | May 13, 2019 21:15 | 15m | 5 | 1 |
| 4 | October 12, 2019 16:30 | October 12, 2019 18:15 | 1h 45m | 1 | 2 |
| 5 | December 28, 2019 16:30 | December 28, 2019 18:30 | 2h | 1 | 2 |
| 6 | December 30, 2019 15:45 | December 31, 2019 00:00 | 8h 15m | 1 | 8 |
Outage episodes by size in 2019: 0 reached 100+ customers, 0 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 2019, 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) | 2018 | 1.7 hrs | 1.08 | 1.7 hrs | 1.08 |
| 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 75% of Montana's customers in 2019; 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, 2019, 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/2019/montana/madison-county