County annual report · FIPS 30017
2022 Custer County, MT Power Outage Report
In 2022, customers in Custer County, MT went without power for an average of 1.1 hours, a total of 7,463 customer-hours (Montana average 3.5 hours). That ranks 46th worst of 50 Montana counties and 2678th of 2,976 nationally.
Compared with MT, the US and 2021
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Custer County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 2, 2022 22:00 | October 3, 2022 02:15 | 4h 15m | 4,016 | 1,909 |
| 2 | October 23, 2022 18:45 | October 23, 2022 22:45 | 4h | 405 | 1,314 |
| 3 | August 1, 2022 22:45 | August 2, 2022 02:30 | 3h 45m | 345 | 1,215 |
| 4 | June 15, 2022 23:45 | June 16, 2022 05:15 | 5h 30m | 284 | 271 |
| 5 | June 26, 2022 00:30 | June 26, 2022 02:15 | 1h 45m | 209 | 361 |
| 6 | June 17, 2022 17:30 | June 17, 2022 19:15 | 1h 45m | 208 | 253 |
| 7 | July 23, 2022 08:00 | July 23, 2022 10:00 | 2h | 207 | 413 |
| 8 | August 10, 2022 01:00 | August 10, 2022 02:45 | 1h 45m | 173 | 128 |
| 9 | August 13, 2022 14:15 | August 13, 2022 16:00 | 1h 45m | 172 | 55 |
| 10 | April 23, 2022 14:15 | April 23, 2022 15:45 | 1h 30m | 140 | 204 |
Outage episodes by size in 2022: 12 reached 100+ customers, 1 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 2022, 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 76% of Montana's customers in 2022; 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, 2022, 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/2022/montana/custer-county