County annual report · FIPS 30095
2020 Stillwater County, MT Power Outage Report
In 2020, customers in Stillwater County, MT went without power for an average of 2.0 hours, a total of 11K customer-hours (Montana average 5.6 hours). That ranks 41st worst of 50 Montana counties and 2246th 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 Stillwater 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 | February 29, 2020 18:15 | February 29, 2020 19:45 | 1h 30m | 1,323 | 1,531 |
| 2 | October 2, 2020 08:15 | October 2, 2020 10:45 | 2h 30m | 1,320 | 3,300 |
| 3 | May 23, 2020 06:45 | May 23, 2020 11:30 | 4h 45m | 535 | 1,285 |
| 4 | March 3, 2020 17:00 | March 4, 2020 23:45 | 1d 6h | 445 | 844 |
| 5 | July 18, 2020 16:45 | July 19, 2020 00:45 | 8h | 394 | 1,200 |
| 6 | August 16, 2020 23:15 | August 17, 2020 01:15 | 2h | 196 | 292 |
| 7 | October 22, 2020 08:45 | October 22, 2020 10:15 | 1h 30m | 190 | 168 |
| 8 | October 14, 2020 05:15 | October 14, 2020 07:45 | 2h 30m | 185 | 463 |
| 9 | March 6, 2020 23:15 | March 7, 2020 00:15 | 1h | 169 | 169 |
| 10 | June 3, 2020 23:45 | June 4, 2020 00:45 | 1h | 120 | 120 |
Outage episodes by size in 2020: 12 reached 100+ customers, 2 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 Stillwater 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 |
| NorthWestern Energy | - | - | - | - | - |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| 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 76% of Montana's customers in 2020; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 5,383 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. Stillwater County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Stillwater 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/stillwater-county