County annual report · FIPS 30041
2025 Hill County, MT Power Outage Report
In 2025, customers in Hill County, MT went without power for an average of 8.3 hours, a total of 65K customer-hours (Montana average 6.8 hours). That ranks 22nd worst of 51 Montana counties and 976th of 3,000 nationally.
Compared with MT, the US and 2024
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Hill County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | December 17, 2025 19:15 | December 18, 2025 18:15 | 23h | 7,012 | 34K |
| 2 | December 23, 2025 09:15 | December 23, 2025 12:45 | 3h 30m | 6,060 | 11K |
| 3 | July 1, 2025 16:15 | July 1, 2025 18:45 | 2h 30m | 865 | 1,079 |
| 4 | August 5, 2025 23:00 | August 6, 2025 16:15 | 17h 15m | 864 | 1,278 |
| 5 | June 15, 2025 23:45 | June 16, 2025 02:30 | 2h 45m | 863 | 2,373 |
| 6 | July 17, 2025 22:00 | July 17, 2025 23:30 | 1h 30m | 863 | 488 |
| 7 | August 1, 2025 08:00 | August 1, 2025 11:00 | 3h | 863 | 510 |
| 8 | August 29, 2025 14:15 | August 29, 2025 18:15 | 4h | 861 | 2,730 |
| 9 | August 20, 2025 06:15 | August 20, 2025 08:15 | 2h | 750 | 897 |
| 10 | September 11, 2025 20:15 | September 11, 2025 23:00 | 2h 45m | 750 | 2,063 |
Outage episodes by size in 2025: 19 reached 100+ customers, 2 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 2025, 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 |
| 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 n/a of Montana's customers in 2025; 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, 2025, 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/2025/montana/hill-county