County annual report · FIPS 30009
2025 Carbon County, MT Power Outage Report
In 2025, customers in Carbon County, MT went without power for an average of 3.5 hours, a total of 23K customer-hours (Montana average 6.8 hours). That ranks 33rd worst of 51 Montana counties and 1913th 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 Carbon 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 16:00 | December 19, 2025 03:00 | 1d 11h | 1,580 | 4,380 |
| 2 | August 23, 2025 06:45 | August 23, 2025 08:15 | 1h 30m | 1,142 | 1,713 |
| 3 | November 24, 2025 21:30 | November 25, 2025 02:00 | 4h 30m | 1,009 | 1,075 |
| 4 | May 6, 2025 00:15 | May 6, 2025 09:00 | 8h 45m | 482 | 498 |
| 5 | January 13, 2025 07:15 | January 13, 2025 18:30 | 11h 15m | 460 | 2,924 |
| 6 | June 10, 2025 03:00 | June 10, 2025 06:30 | 3h 30m | 451 | 1,579 |
| 7 | June 12, 2025 01:15 | June 12, 2025 07:00 | 5h 45m | 451 | 2,593 |
| 8 | May 24, 2025 14:15 | May 24, 2025 17:15 | 3h | 423 | 766 |
| 9 | July 5, 2025 19:15 | July 5, 2025 22:15 | 3h | 240 | 360 |
| 10 | November 14, 2025 19:45 | November 14, 2025 22:45 | 3h | 196 | 556 |
Outage episodes by size in 2025: 18 reached 100+ customers, 3 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 Carbon 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 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Flathead Electric Coop Inc | 2024 | 9.8 hrs | 2.72 | 3.9 hrs | 1.90 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| NorthWestern Energy | - | - | - | - | - |
| Yellowstone Valley Elec Co-op | - | - | - | - | - |
| Beartooth 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 ÷ 6,512 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. Carbon County has data for 2016, 2018–2025.
Cite this report
MassOutage (massoutage.com), Carbon 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/carbon-county