County annual report · FIPS 30051
2025 Liberty County, MT Power Outage Report
In 2025, customers in Liberty County, MT went without power for an average of 14.3 hours, a total of 12K customer-hours (Montana average 6.8 hours). That ranks 11th worst of 51 Montana counties and 537th 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 Liberty 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 23:00 | December 18, 2025 04:45 | 5h 45m | 1,507 | 3,990 |
| 2 | May 11, 2025 00:15 | May 11, 2025 02:15 | 2h | 828 | 1,147 |
| 3 | August 1, 2025 15:15 | August 1, 2025 21:15 | 6h | 828 | 4,389 |
| 4 | August 20, 2025 06:15 | August 20, 2025 07:15 | 1h | 573 | 543 |
| 5 | September 11, 2025 20:15 | September 11, 2025 21:15 | 1h | 573 | 573 |
| 6 | December 17, 2025 18:30 | December 17, 2025 20:00 | 1h 30m | 149 | 186 |
| 7 | March 23, 2025 18:45 | March 23, 2025 21:00 | 2h 15m | 106 | 190 |
| 8 | March 27, 2025 01:00 | March 27, 2025 02:00 | 1h | 106 | 106 |
| 9 | January 22, 2025 06:00 | January 22, 2025 09:30 | 3h 30m | 33 | 92 |
| 10 | March 10, 2025 19:30 | March 10, 2025 23:30 | 4h | 15 | 28 |
Outage episodes by size in 2025: 8 reached 100+ customers, 1 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 Liberty 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 | - | - | - | - | - |
| Sun River Electric Coop, Inc | - | - | - | - | - |
| Hill County Electric Coop, Inc | - | - | - | - | - |
| Marias River 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 ÷ 804 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. Liberty County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Liberty 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/liberty-county