County annual report · FIPS 30049
2024 Lewis and Clark County, MT Power Outage Report
In 2024, customers in Lewis and Clark County, MT went without power for an average of 3.6 hours, a total of 119K customer-hours (Montana average 8.5 hours). That ranks 32nd worst of 51 Montana counties and 1939th of 2,990 nationally.
Compared with MT, the US and 2023
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Lewis and Clark County, 2024
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | May 6, 2024 17:30 | May 7, 2024 12:30 | 19h | 3,211 | 24K |
| 2 | July 4, 2024 11:00 | July 4, 2024 16:15 | 5h 15m | 2,770 | 8,305 |
| 3 | December 18, 2024 23:45 | December 19, 2024 12:15 | 12h 30m | 1,976 | 3,379 |
| 4 | March 26, 2024 15:45 | March 28, 2024 12:30 | 1d 20h | 1,885 | 3,853 |
| 5 | January 30, 2024 19:30 | January 31, 2024 01:15 | 5h 45m | 1,881 | 7,053 |
| 6 | October 5, 2024 01:30 | October 6, 2024 01:00 | 23h 30m | 1,427 | 12K |
| 7 | May 8, 2024 08:30 | May 10, 2024 00:45 | 1d 16h | 1,412 | 15K |
| 8 | August 7, 2024 00:00 | August 7, 2024 11:15 | 11h 15m | 1,409 | 2,131 |
| 9 | March 29, 2024 15:30 | March 29, 2024 23:00 | 7h 30m | 1,216 | 637 |
| 10 | August 23, 2024 21:00 | August 24, 2024 09:00 | 12h | 1,209 | 3,413 |
Outage episodes by size in 2024: 37 reached 100+ customers, 10 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 2024, 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) | 2024 | 3.9 hrs | 1.30 | 2.0 hrs | 0.95 |
| 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 n/a of Montana's customers in 2024; 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, 2024, 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/2024/montana/lewis-and-clark-county