County annual report · FIPS 30049
2025 Lewis and Clark County, MT Power Outage Report
In 2025, customers in Lewis and Clark County, MT went without power for an average of 8.4 hours, a total of 278K customer-hours (Montana average 6.8 hours). That ranks 21st worst of 51 Montana counties and 957th of 3,000 nationally.
Compared with MT, the US and 2024
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Lewis and Clark County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 3, 2025 13:15 | June 4, 2025 05:30 | 16h 15m | 12,309 | 28K |
| 2 | December 17, 2025 15:00 | December 22, 2025 04:00 | 4d 13h | 9,800 | 154K |
| 3 | October 13, 2025 03:45 | October 13, 2025 15:15 | 11h 30m | 2,874 | 5,896 |
| 4 | August 4, 2025 02:45 | August 5, 2025 05:15 | 1d 2h | 2,687 | 13K |
| 5 | June 20, 2025 15:15 | June 20, 2025 23:00 | 7h 45m | 2,103 | 652 |
| 6 | July 9, 2025 22:15 | July 10, 2025 18:15 | 20h | 2,081 | 2,937 |
| 7 | August 24, 2025 02:15 | August 24, 2025 06:45 | 4h 30m | 2,073 | 3,640 |
| 8 | December 16, 2025 08:15 | December 16, 2025 11:30 | 3h 15m | 2,067 | 1,792 |
| 9 | April 1, 2025 11:15 | April 3, 2025 03:30 | 1d 16h | 1,958 | 18K |
| 10 | May 29, 2025 23:45 | May 30, 2025 06:15 | 6h 30m | 1,418 | 5,322 |
Outage episodes by size in 2025: 33 reached 100+ customers, 10 reached 1,000+ customers, 1 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 2025, 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 2025; 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, 2025, 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/2025/montana/lewis-and-clark-county