County annual report · FIPS 30097
2024 Sweet Grass County, MT Power Outage Report
In 2024, customers in Sweet Grass County, MT went without power for an average of 5.0 hours, a total of 9,985 customer-hours (Montana average 8.5 hours). That ranks 27th worst of 51 Montana counties and 1609th of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sweet Grass County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 12, 2024 23:15 | August 13, 2024 04:30 | 5h 15m | 522 | 1,049 |
| 2 | April 15, 2024 12:30 | April 15, 2024 15:00 | 2h 30m | 411 | 778 |
| 3 | May 23, 2024 17:30 | May 24, 2024 00:15 | 6h 45m | 351 | 1,073 |
| 4 | August 19, 2024 19:45 | August 19, 2024 22:30 | 2h 45m | 350 | 673 |
| 5 | September 23, 2024 20:45 | September 24, 2024 00:00 | 3h 15m | 301 | 411 |
| 6 | July 13, 2024 02:00 | July 13, 2024 04:30 | 2h 30m | 261 | 625 |
| 7 | April 14, 2024 15:15 | April 14, 2024 20:45 | 5h 30m | 246 | 456 |
| 8 | August 8, 2024 03:00 | August 8, 2024 10:00 | 7h | 230 | 1,075 |
| 9 | April 27, 2024 17:30 | April 27, 2024 23:30 | 6h | 161 | 413 |
| 10 | June 18, 2024 12:00 | June 18, 2024 20:45 | 8h 45m | 85 | 514 |
Outage episodes by size in 2024: 9 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 2024, 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 |
| 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 2024; 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, 2024, 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/2024/montana/sweet-grass-county