County annual report · FIPS 30097
2020 Sweet Grass County, MT Power Outage Report
In 2020, customers in Sweet Grass County, MT went without power for an average of 7.1 hours, a total of 14K customer-hours (Montana average 5.6 hours). That ranks 19th worst of 50 Montana counties and 1071st of 3,019 nationally.
Compared with MT, the US
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Sweet Grass County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | July 23, 2020 00:30 | July 23, 2020 04:30 | 4h | 575 | 1,715 |
| 2 | August 6, 2020 22:00 | August 7, 2020 01:45 | 3h 45m | 575 | 1,431 |
| 3 | July 5, 2020 02:45 | July 5, 2020 06:30 | 3h 45m | 323 | 1,211 |
| 4 | February 2, 2020 21:45 | February 3, 2020 09:30 | 11h 45m | 285 | 2,635 |
| 5 | April 28, 2020 03:15 | April 28, 2020 09:00 | 5h 45m | 226 | 770 |
| 6 | August 4, 2020 02:15 | August 4, 2020 11:45 | 9h 30m | 206 | 1,737 |
| 7 | September 2, 2020 19:45 | September 2, 2020 23:30 | 3h 45m | 147 | 215 |
| 8 | July 7, 2020 15:30 | July 8, 2020 09:00 | 17h 30m | 133 | 296 |
| 9 | February 1, 2020 10:30 | February 2, 2020 05:30 | 19h | 129 | 466 |
| 10 | June 25, 2020 08:00 | June 25, 2020 20:15 | 12h 15m | 117 | 179 |
Outage episodes by size in 2020: 12 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 2020, 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) | 2020 | 2.8 hrs | 1.13 | 2.0 hrs | 1.02 |
| 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 2020; 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, 2020, 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/2020/montana/sweet-grass-county