County annual report · FIPS 30041
2021 Hill County, MT Power Outage Report
In 2021, customers in Hill County, MT went without power for an average of 7.9 hours, a total of 62K customer-hours (Montana average 5.0 hours). That ranks 19th worst of 51 Montana counties and 942nd 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 Hill 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 | November 5, 2021 02:45 | November 5, 2021 13:15 | 10h 30m | 7,180 | 25K |
| 2 | April 27, 2021 17:15 | April 27, 2021 19:00 | 1h 45m | 2,934 | 4,255 |
| 3 | July 12, 2021 00:00 | July 12, 2021 03:30 | 3h 30m | 1,800 | 2,617 |
| 4 | January 13, 2021 19:00 | January 16, 2021 00:30 | 2d 5h | 1,687 | 10K |
| 5 | February 18, 2021 20:15 | February 18, 2021 22:00 | 1h 45m | 1,493 | 2,613 |
| 6 | July 6, 2021 07:15 | July 6, 2021 13:00 | 5h 45m | 851 | 2,366 |
| 7 | August 3, 2021 00:45 | August 3, 2021 03:00 | 2h 15m | 850 | 1,612 |
| 8 | August 30, 2021 21:45 | August 30, 2021 22:00 | 15m | 765 | 191 |
| 9 | August 17, 2021 22:00 | August 18, 2021 01:00 | 3h | 764 | 969 |
| 10 | September 30, 2021 08:00 | September 30, 2021 11:15 | 3h 15m | 733 | 2,382 |
Outage episodes by size in 2021: 22 reached 100+ customers, 5 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 Hill 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 |
|---|---|---|---|---|---|
| NorthWestern Energy LLC - (MT) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Hill County 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 ÷ 7,876 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. Hill County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Hill 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/hill-county