County annual report · FIPS 30075
2021 Powder River County, MT Power Outage Report
In 2021, customers in Powder River County, MT went without power for an average of 1.0 hours, a total of 589 customer-hours (Montana average 5.0 hours). That ranks 47th worst of 51 Montana counties and 2662nd of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Powder River County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | January 14, 2021 19:30 | January 14, 2021 20:00 | 30m | 32 | 10 |
| 2 | January 28, 2021 23:45 | January 29, 2021 00:00 | 15m | 32 | 8 |
| 3 | March 12, 2021 17:30 | March 12, 2021 17:45 | 15m | 32 | 8 |
| 4 | March 12, 2021 19:15 | March 12, 2021 19:30 | 15m | 32 | 8 |
| 5 | March 29, 2021 21:15 | March 29, 2021 23:15 | 2h | 32 | 64 |
| 6 | May 27, 2021 00:45 | May 27, 2021 02:45 | 2h | 32 | 64 |
| 7 | June 17, 2021 02:30 | June 17, 2021 03:15 | 45m | 32 | 24 |
| 8 | June 17, 2021 13:15 | June 17, 2021 13:45 | 30m | 32 | 16 |
| 9 | June 20, 2021 09:15 | June 20, 2021 12:15 | 3h | 32 | 96 |
| 10 | August 30, 2021 23:15 | August 31, 2021 01:30 | 2h 15m | 32 | 72 |
Outage episodes by size in 2021: 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 Powder River County reported on EIA Form 861 for 2021, 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 |
|---|---|---|---|---|---|
| Black Hills Power, Inc. | 2021 | 2.6 hrs | 1.17 | 41 min | 0.32 |
| Powder River Energy Corp | 2021 | 5.4 hrs | 2.15 | 3.9 hrs | 1.91 |
| 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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 583 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. Powder River County has data for 2016–2025.
Cite this report
MassOutage (massoutage.com), Powder River County, MT annual power outage report, 2021, 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/2021/montana/powder-river-county