County annual report · FIPS 30017
2019 Custer County, MT Power Outage Report
In 2019, customers in Custer County, MT went without power for an average of 0.7 hours, a total of 4,532 customer-hours (Montana average 0.6 hours). That ranks 17th worst of 38 Montana counties and 2626th 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 Custer County, 2019
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 26, 2019 10:00 | September 26, 2019 10:30 | 30m | 892 | 224 |
| 2 | July 8, 2019 03:15 | July 8, 2019 05:15 | 2h | 758 | 1,126 |
| 3 | July 15, 2019 03:30 | July 15, 2019 11:15 | 7h 45m | 534 | 894 |
| 4 | April 24, 2019 19:00 | April 24, 2019 21:45 | 2h 45m | 521 | 962 |
| 5 | November 30, 2019 19:30 | November 30, 2019 20:45 | 1h 15m | 348 | 432 |
| 6 | August 11, 2019 17:15 | August 11, 2019 19:15 | 2h | 122 | 56 |
| 7 | June 25, 2019 10:45 | June 25, 2019 14:45 | 4h | 114 | 134 |
| 8 | September 26, 2019 20:45 | September 26, 2019 21:45 | 1h | 76 | 76 |
| 9 | November 7, 2019 19:00 | November 7, 2019 20:15 | 1h 15m | 51 | 52 |
| 10 | July 18, 2019 03:00 | July 18, 2019 04:00 | 1h | 38 | 14 |
Outage episodes by size in 2019: 7 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 Custer 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 |
|---|---|---|---|---|---|
| Mid-Yellowstone Elec Coop, Inc | 2018 | 4.5 hrs | 3.82 | 4.5 hrs | 3.82 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| 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 75% of Montana's customers in 2019; 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, 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/custer-county