County annual report · FIPS 30003
2019 Big Horn County, MT Power Outage Report
In 2019, customers in Big Horn County, MT went without power for an average of 0.1 hours, a total of 435 customer-hours (Montana average 0.6 hours). That ranks 21st worst of 38 Montana counties and 2840th of 2,945 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Big Horn 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 | April 7, 2019 19:30 | April 7, 2019 20:45 | 1h 15m | 26 | 19 |
| 2 | April 8, 2019 01:30 | April 8, 2019 03:00 | 1h 30m | 16 | 24 |
| 3 | August 10, 2019 22:15 | August 11, 2019 01:45 | 3h 30m | 11 | 39 |
| 4 | October 16, 2019 16:30 | October 16, 2019 21:00 | 4h 30m | 10 | 42 |
| 5 | October 23, 2019 02:30 | October 23, 2019 08:00 | 5h 30m | 8 | 28 |
| 6 | September 9, 2019 15:45 | September 9, 2019 22:30 | 6h 45m | 7 | 25 |
| 7 | June 9, 2019 21:15 | June 10, 2019 06:15 | 9h | 6 | 43 |
| 8 | July 3, 2019 07:45 | July 3, 2019 13:00 | 5h 15m | 6 | 17 |
| 9 | July 13, 2019 05:15 | July 13, 2019 06:30 | 1h 15m | 6 | 3 |
| 10 | March 4, 2019 22:00 | March 5, 2019 00:45 | 2h 45m | 5 | 5 |
Outage episodes by size in 2019: 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 Big Horn 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2018 | 1.7 hrs | 1.08 | 1.7 hrs | 1.08 |
| Powder River Energy Corp | 2018 | 2.8 hrs | 1.52 | 2.8 hrs | 1.52 |
| 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 75% of Montana's customers in 2019; 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, 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/big-horn-county