County annual report · FIPS 30097
2022 Sweet Grass County, MT Power Outage Report
In 2022, customers in Sweet Grass County, MT went without power for an average of 6.2 hours, a total of 12K customer-hours (Montana average 3.5 hours). That ranks 20th worst of 50 Montana counties and 1170th of 2,976 nationally.
Compared with MT, the US and 2021
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sweet Grass County, 2022
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 10, 2022 20:15 | June 11, 2022 00:45 | 4h 30m | 293 | 1,175 |
| 2 | July 18, 2022 15:15 | July 18, 2022 19:45 | 4h 30m | 292 | 1,039 |
| 3 | March 12, 2022 11:00 | March 12, 2022 16:30 | 5h 30m | 290 | 1,383 |
| 4 | September 20, 2022 13:30 | September 20, 2022 20:00 | 6h 30m | 230 | 275 |
| 5 | March 12, 2022 01:30 | March 12, 2022 08:00 | 6h 30m | 225 | 883 |
| 6 | February 10, 2022 19:45 | February 11, 2022 01:45 | 6h | 222 | 1,307 |
| 7 | July 26, 2022 23:00 | July 27, 2022 01:00 | 2h | 222 | 315 |
| 8 | August 17, 2022 16:45 | August 17, 2022 20:45 | 4h | 174 | 581 |
| 9 | July 27, 2022 14:45 | July 27, 2022 22:15 | 7h 30m | 170 | 408 |
| 10 | October 7, 2022 22:15 | October 8, 2022 00:00 | 1h 45m | 94 | 158 |
Outage episodes by size in 2022: 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 2022, 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) | 2022 | 2.2 hrs | 1.14 | 2.0 hrs | 1.09 |
| 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 76% of Montana's customers in 2022; 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, 2022, 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/2022/montana/sweet-grass-county