County annual report · FIPS 30005
2021 Blaine County, MT Power Outage Report
In 2021, customers in Blaine County, MT went without power for an average of 8.6 hours, a total of 24K customer-hours (Montana average 5.0 hours). That ranks 15th worst of 51 Montana counties and 885th of 2,974 nationally.
Compared with MT, the US and 2020
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Blaine County, 2021
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | November 5, 2021 02:45 | November 5, 2021 10:00 | 7h 15m | 2,641 | 18K |
| 2 | January 10, 2021 16:45 | January 10, 2021 22:30 | 5h 45m | 190 | 330 |
| 3 | January 15, 2021 23:00 | January 27, 2021 00:15 | 11d 1h | 143 | 573 |
| 4 | January 13, 2021 21:45 | January 15, 2021 04:15 | 1d 6h | 134 | 1,487 |
| 5 | July 11, 2021 23:30 | July 12, 2021 03:15 | 3h 45m | 123 | 226 |
| 6 | April 27, 2021 17:45 | April 27, 2021 19:00 | 1h 15m | 109 | 136 |
| 7 | January 10, 2021 11:45 | January 10, 2021 15:00 | 3h 15m | 83 | 159 |
| 8 | May 12, 2021 14:00 | May 12, 2021 17:15 | 3h 15m | 82 | 146 |
| 9 | January 13, 2021 18:45 | January 13, 2021 20:45 | 2h | 64 | 90 |
| 10 | August 31, 2021 21:00 | August 31, 2021 21:30 | 30m | 64 | 32 |
Outage episodes by size in 2021: 6 reached 100+ customers, 1 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 Blaine County reported on EIA Form 861 for 2021, 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) | 2021 | 2.5 hrs | 1.37 | 2.1 hrs | 1.18 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Fergus Electric Coop, Inc | - | - | - | - | - |
| Hill County Electric Coop, Inc | - | - | - | - | - |
| Big Flat 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 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,740 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. Blaine County has data for 2020–2025.
Cite this report
MassOutage (massoutage.com), Blaine County, MT annual power outage report, 2021, 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/2021/montana/blaine-county