County annual report · FIPS 30003
2023 Big Horn County, MT Power Outage Report
In 2023, customers in Big Horn County, MT went without power for an average of 0.4 hours, a total of 3,047 customer-hours (Montana average 1.8 hours). That ranks 44th worst of 50 Montana counties and 2831st of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Big Horn County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 30, 2023 07:45 | November 30, 2023 15:15 | 7h 30m | 187 | 1,356 |
| 2 | June 26, 2023 14:45 | June 26, 2023 15:45 | 1h | 104 | 27 |
| 3 | July 17, 2023 14:15 | July 17, 2023 16:30 | 2h 15m | 104 | 234 |
| 4 | September 1, 2023 20:45 | September 1, 2023 21:30 | 45m | 104 | 78 |
| 5 | September 5, 2023 15:45 | September 5, 2023 16:00 | 15m | 83 | 21 |
| 6 | June 29, 2023 04:00 | June 29, 2023 15:00 | 11h | 62 | 644 |
| 7 | September 22, 2023 10:15 | September 22, 2023 13:30 | 3h 15m | 36 | 77 |
| 8 | October 16, 2023 15:30 | October 16, 2023 17:15 | 1h 45m | 35 | 61 |
| 9 | June 15, 2023 11:45 | June 15, 2023 18:45 | 7h | 31 | 197 |
| 10 | May 23, 2023 20:30 | May 23, 2023 21:00 | 30m | 28 | 14 |
Outage episodes by size in 2023: 4 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| Powder River Energy Corp | 2023 | 3.4 hrs | 1.40 | 3.4 hrs | 1.40 |
| 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 2023; 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, 2023, 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/2023/montana/big-horn-county