County annual report · FIPS 30049
2022 Lewis and Clark County, MT Power Outage Report
In 2022, customers in Lewis and Clark County, MT went without power for an average of 2.9 hours, a total of 95K customer-hours (Montana average 3.5 hours). That ranks 31st worst of 50 Montana counties and 1987th of 2,976 nationally.
Compared with MT, the US and 2021
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Lewis and Clark County, 2022
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, 2022 13:45 | November 7, 2022 08:00 | 1d 18h | 2,780 | 26K |
| 2 | October 23, 2022 05:30 | October 24, 2022 06:30 | 1d 1h | 2,152 | 6,475 |
| 3 | April 5, 2022 12:00 | April 5, 2022 21:15 | 9h 15m | 2,088 | 1,078 |
| 4 | August 23, 2022 05:45 | August 23, 2022 13:15 | 7h 30m | 1,820 | 12K |
| 5 | July 4, 2022 20:00 | July 5, 2022 02:30 | 6h 30m | 1,357 | 2,042 |
| 6 | February 24, 2022 05:15 | February 24, 2022 10:30 | 5h 15m | 1,239 | 2,091 |
| 7 | November 27, 2022 22:45 | November 28, 2022 03:30 | 4h 45m | 1,060 | 2,545 |
| 8 | April 29, 2022 03:45 | April 29, 2022 08:15 | 4h 30m | 797 | 1,548 |
| 9 | July 22, 2022 20:00 | July 23, 2022 04:15 | 8h 15m | 797 | 1,699 |
| 10 | April 18, 2022 14:15 | April 18, 2022 17:00 | 2h 45m | 796 | 1,006 |
Outage episodes by size in 2022: 40 reached 100+ customers, 7 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 Lewis and Clark County reported on EIA Form 861 for 2022, 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) | 2022 | 2.2 hrs | 1.14 | 2.0 hrs | 1.09 |
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Vigilante Electric Coop, Inc | - | - | - | - | - |
| Sun River 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 2022; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 32,887 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. Lewis and Clark County has data for 2019–2025.
Cite this report
MassOutage (massoutage.com), Lewis and Clark County, MT annual power outage report, 2022, 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/2022/montana/lewis-and-clark-county