County annual report · FIPS 30097
2023 Sweet Grass County, MT Power Outage Report
In 2023, customers in Sweet Grass County, MT went without power for an average of 4.7 hours, a total of 9,435 customer-hours (Montana average 1.8 hours). That ranks 10th worst of 50 Montana counties and 1521st 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 Sweet Grass 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 21, 2023 07:15 | September 21, 2023 19:15 | 12h | 297 | 2,491 |
| 2 | October 1, 2023 21:30 | October 2, 2023 00:30 | 3h | 297 | 817 |
| 3 | September 9, 2023 01:00 | September 9, 2023 04:15 | 3h 15m | 295 | 887 |
| 4 | January 23, 2023 01:45 | January 23, 2023 07:00 | 5h 15m | 292 | 1,389 |
| 5 | November 19, 2023 13:00 | November 19, 2023 17:45 | 4h 45m | 261 | 1,176 |
| 6 | August 30, 2023 21:15 | August 31, 2023 00:15 | 3h | 233 | 408 |
| 7 | July 24, 2023 15:00 | July 25, 2023 00:45 | 9h 45m | 200 | 896 |
| 8 | March 19, 2023 02:15 | March 19, 2023 08:00 | 5h 45m | 85 | 282 |
| 9 | July 9, 2023 14:30 | July 9, 2023 21:30 | 7h | 69 | 77 |
| 10 | April 26, 2023 18:30 | April 26, 2023 22:30 | 4h | 51 | 121 |
Outage episodes by size in 2023: 7 reached 100+ customers, 0 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 Sweet Grass 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 |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Beartooth Electric Coop, Inc | - | - | - | - | - |
| Park 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 ÷ 1,993 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. Sweet Grass County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Sweet Grass 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/sweet-grass-county