County annual report · FIPS 30049
2023 Lewis and Clark County, MT Power Outage Report
In 2023, customers in Lewis and Clark County, MT went without power for an average of 2.3 hours, a total of 74K customer-hours (Montana average 1.8 hours). That ranks 22nd worst of 50 Montana counties and 2198th of 2,977 nationally.
Compared with MT, the US and 2022
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Lewis and Clark County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | March 29, 2023 16:30 | March 29, 2023 18:45 | 2h 15m | 5,382 | 4,042 |
| 2 | January 17, 2023 22:15 | January 18, 2023 00:00 | 1h 45m | 3,448 | 6,033 |
| 3 | June 9, 2023 02:00 | June 9, 2023 09:15 | 7h 15m | 2,802 | 9,118 |
| 4 | July 10, 2023 19:30 | July 11, 2023 16:30 | 21h | 2,482 | 3,409 |
| 5 | April 21, 2023 23:00 | April 22, 2023 03:15 | 4h 15m | 2,085 | 2,614 |
| 6 | December 15, 2023 09:00 | December 15, 2023 13:00 | 4h | 1,480 | 1,855 |
| 7 | May 30, 2023 19:15 | May 30, 2023 21:30 | 2h 15m | 1,275 | 1,595 |
| 8 | October 18, 2023 15:00 | October 18, 2023 21:15 | 6h 15m | 1,272 | 1,606 |
| 9 | September 11, 2023 15:45 | September 11, 2023 20:45 | 5h | 1,180 | 2,671 |
| 10 | January 27, 2023 22:45 | January 28, 2023 02:45 | 4h | 1,092 | 4,096 |
Outage episodes by size in 2023: 38 reached 100+ customers, 11 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 2023, 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) | 2023 | 1.7 hrs | 0.93 | 1.7 hrs | 0.93 |
| 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 2023; 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, 2023, 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/2023/montana/lewis-and-clark-county