County annual report · FIPS 30003
2024 Big Horn County, MT Power Outage Report
In 2024, customers in Big Horn County, MT went without power for an average of 2.6 hours, a total of 18K customer-hours (Montana average 8.5 hours). That ranks 35th worst of 51 Montana counties and 2210th 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 Big Horn 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 10, 2024 15:15 | July 16, 2024 17:45 | 6d 2h | 102 | 14K |
| 2 | July 2, 2024 15:15 | July 2, 2024 15:45 | 30m | 99 | 50 |
| 3 | July 17, 2024 15:15 | July 17, 2024 19:45 | 4h 30m | 99 | 396 |
| 4 | February 6, 2024 00:00 | February 6, 2024 01:00 | 1h | 60 | 57 |
| 5 | January 17, 2024 16:45 | January 17, 2024 18:30 | 1h 45m | 51 | 88 |
| 6 | October 5, 2024 15:30 | October 5, 2024 19:30 | 4h | 37 | 148 |
| 7 | September 25, 2024 03:45 | September 25, 2024 11:30 | 7h 45m | 34 | 121 |
| 8 | June 6, 2024 16:15 | June 6, 2024 16:30 | 15m | 29 | 7 |
| 9 | June 19, 2024 16:15 | June 19, 2024 17:00 | 45m | 28 | 17 |
| 10 | April 22, 2024 15:30 | April 22, 2024 18:00 | 2h 30m | 25 | 63 |
Outage episodes by size in 2024: 1 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 Big Horn 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2024 | 3.9 hrs | 1.30 | 2.0 hrs | 0.95 |
| Powder River Energy Corp | 2024 | 8.3 hrs | 2.88 | 4.9 hrs | 2.24 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Mid-Yellowstone Elec Coop, Inc | 2018 | 4.5 hrs | 3.82 | 4.5 hrs | 3.82 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Tongue River Electric Coop Inc | - | - | - | - | - |
| Yellowstone Valley Elec Co-op | - | - | - | - | - |
| Big Horn County Elec 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 ÷ 6,865 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. Big Horn County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Big Horn 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/big-horn-county