County annual report · FIPS 30017
2024 Custer County, MT Power Outage Report
In 2024, customers in Custer County, MT went without power for an average of 5.5 hours, a total of 38K customer-hours (Montana average 8.5 hours). That ranks 24th worst of 51 Montana counties and 1499th 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 Custer 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 | July 14, 2024 01:15 | July 15, 2024 01:15 | 1d | 2,045 | 31K |
| 2 | August 11, 2024 11:30 | August 11, 2024 14:00 | 2h 30m | 1,375 | 1,783 |
| 3 | September 13, 2024 02:45 | September 13, 2024 07:45 | 5h | 888 | 1,437 |
| 4 | May 6, 2024 01:15 | May 6, 2024 05:45 | 4h 30m | 586 | 2,292 |
| 5 | July 10, 2024 14:00 | July 10, 2024 14:45 | 45m | 153 | 100 |
| 6 | June 15, 2024 01:30 | June 15, 2024 03:00 | 1h 30m | 119 | 178 |
| 7 | July 7, 2024 23:45 | July 8, 2024 01:30 | 1h 45m | 119 | 206 |
| 8 | September 16, 2024 08:45 | September 16, 2024 10:30 | 1h 45m | 50 | 86 |
| 9 | December 19, 2024 03:15 | December 19, 2024 06:00 | 2h 45m | 32 | 83 |
| 10 | November 18, 2024 19:30 | November 18, 2024 20:15 | 45m | 31 | 14 |
Outage episodes by size in 2024: 7 reached 100+ customers, 2 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 Custer 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 |
|---|---|---|---|---|---|
| Montana-Dakota Utilities Co | 2024 | 2.9 hrs | 1.26 | 2.1 hrs | 1.10 |
| Mid-Yellowstone Elec Coop, Inc | 2018 | 4.5 hrs | 3.82 | 4.5 hrs | 3.82 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| McCone Electric Coop Inc | - | - | - | - | - |
| Tongue River Electric Coop Inc | - | - | - | - | - |
| Southeast 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 ÷ 6,942 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. Custer County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Custer 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/custer-county