County annual report · FIPS 30047
2021 Lake County, MT Power Outage Report
In 2021, customers in Lake County, MT went without power for an average of 1.6 hours, a total of 39K customer-hours (Montana average 5.0 hours). That ranks 39th worst of 51 Montana counties and 2398th 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 Lake 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 | January 13, 2021 17:00 | January 17, 2021 14:30 | 3d 21h | 979 | 31K |
| 2 | May 26, 2021 07:45 | May 26, 2021 17:15 | 9h 30m | 334 | 2,621 |
| 3 | November 5, 2021 13:00 | November 5, 2021 16:45 | 3h 45m | 334 | 977 |
| 4 | August 29, 2021 10:30 | August 29, 2021 14:30 | 4h | 332 | 428 |
| 5 | November 24, 2021 10:30 | November 24, 2021 14:15 | 3h 45m | 256 | 591 |
| 6 | September 25, 2021 11:00 | September 25, 2021 14:30 | 3h 30m | 255 | 538 |
| 7 | May 23, 2021 14:00 | May 23, 2021 14:30 | 30m | 202 | 51 |
| 8 | October 18, 2021 21:15 | October 19, 2021 00:00 | 2h 45m | 202 | 379 |
| 9 | November 5, 2021 18:30 | November 5, 2021 19:45 | 1h 15m | 114 | 142 |
| 10 | June 16, 2021 01:45 | June 16, 2021 13:30 | 11h 45m | 87 | 679 |
Outage episodes by size in 2021: 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 Lake 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 |
|---|---|---|---|---|---|
| Missoula Electric Coop, Inc | 2021 | 12.7 hrs | 3.21 | 6.5 hrs | 2.76 |
| Flathead Electric Coop Inc | 2021 | 11.2 hrs | 2.62 | 2.7 hrs | 1.97 |
| USBIA-Mission Valley Power | - | - | - | - | - |
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 ÷ 24,041 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. Lake County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Lake 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/lake-county