County annual report · FIPS 30009
2023 Carbon County, MT Power Outage Report
In 2023, customers in Carbon County, MT went without power for an average of 6.9 hours, a total of 45K customer-hours (Montana average 1.8 hours). That ranks 6th worst of 50 Montana counties and 1152nd of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Carbon County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | September 22, 2023 22:15 | September 23, 2023 01:00 | 2h 45m | 2,789 | 3,960 |
| 2 | June 26, 2023 23:30 | June 27, 2023 04:15 | 4h 45m | 1,900 | 2,145 |
| 3 | March 25, 2023 05:00 | March 27, 2023 04:00 | 1d 23h | 1,639 | 20K |
| 4 | April 17, 2023 16:45 | April 17, 2023 21:45 | 5h | 1,368 | 1,764 |
| 5 | May 16, 2023 19:00 | May 16, 2023 20:30 | 1h 30m | 1,133 | 1,417 |
| 6 | September 11, 2023 06:45 | September 11, 2023 09:45 | 3h | 981 | 2,223 |
| 7 | November 25, 2023 20:45 | November 26, 2023 01:00 | 4h 15m | 964 | 1,933 |
| 8 | June 20, 2023 19:30 | June 21, 2023 05:00 | 9h 30m | 479 | 195 |
| 9 | August 2, 2023 21:00 | August 3, 2023 04:30 | 7h 30m | 446 | 1,453 |
| 10 | January 28, 2023 08:15 | January 28, 2023 16:30 | 8h 15m | 438 | 3,498 |
Outage episodes by size in 2023: 15 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 Carbon County reported on EIA Form 861 for 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| Big Horn Rural Electric Co | 2018 | 4.0 hrs | 1.80 | - | - |
| Flathead Electric Coop Inc | 2023 | 2.7 hrs | 1.62 | 2.7 hrs | 1.62 |
| 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 2023; 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, 2023, 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/2023/montana/carbon-county