County annual report · FIPS 30095
2023 Stillwater County, MT Power Outage Report
In 2023, customers in Stillwater County, MT went without power for an average of 0.3 hours, a total of 1,480 customer-hours (Montana average 1.8 hours). That ranks 46th worst of 50 Montana counties and 2866th 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 Stillwater 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 | July 19, 2023 16:45 | July 19, 2023 17:45 | 1h | 500 | 376 |
| 2 | August 30, 2023 21:45 | August 31, 2023 17:15 | 19h 30m | 217 | 516 |
| 3 | October 17, 2023 20:30 | October 17, 2023 21:30 | 1h | 213 | 108 |
| 4 | October 26, 2023 12:00 | October 26, 2023 18:00 | 6h | 50 | 76 |
| 5 | February 25, 2023 09:00 | February 25, 2023 17:15 | 8h 15m | 31 | 166 |
| 6 | October 20, 2023 18:45 | October 20, 2023 22:45 | 4h | 17 | 50 |
| 7 | January 18, 2023 17:00 | January 18, 2023 19:00 | 2h | 9 | 18 |
| 8 | November 21, 2023 00:15 | November 21, 2023 09:15 | 9h | 6 | 30 |
| 9 | November 20, 2023 21:00 | November 20, 2023 23:00 | 2h | 5 | 9 |
| 10 | February 25, 2023 01:45 | February 25, 2023 03:00 | 1h 15m | 4 | 3 |
Outage episodes by size in 2023: 3 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 Stillwater 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 |
| 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 n/a of Montana's customers in 2023; 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, 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/stillwater-county