County annual report · FIPS 30021
2018 Dawson County, MT Power Outage Report
In 2018, customers in Dawson County, MT went without power for an average of 0.7 hours, a total of 5,220 customer-hours (Montana average 1.9 hours). That ranks 10th worst of 20 Montana counties and 2431st of 2,798 nationally.
Compared with MT, the US and 2017
Coverage line is EAGLE-I's share of Montana customers tracked each year.
Biggest outages in Dawson County, 2018
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | April 30, 2018 01:15 | April 30, 2018 05:30 | 4h 15m | 819 | 871 |
| 2 | April 24, 2018 00:15 | April 24, 2018 04:00 | 3h 45m | 676 | 2,375 |
| 3 | August 6, 2018 05:15 | August 6, 2018 06:00 | 45m | 623 | 313 |
| 4 | September 20, 2018 13:45 | September 20, 2018 16:45 | 3h | 455 | 791 |
| 5 | June 16, 2018 10:15 | June 16, 2018 11:45 | 1h 30m | 149 | 172 |
| 6 | March 10, 2018 13:45 | March 10, 2018 17:15 | 3h 30m | 100 | 321 |
| 7 | September 10, 2018 16:30 | September 10, 2018 17:00 | 30m | 62 | 17 |
| 8 | August 24, 2018 12:30 | August 24, 2018 13:45 | 1h 15m | 41 | 46 |
| 9 | September 15, 2018 04:00 | September 15, 2018 05:45 | 1h 45m | 39 | 47 |
| 10 | June 1, 2018 23:30 | June 2, 2018 01:45 | 2h 15m | 16 | 31 |
Outage episodes by size in 2018: 6 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 Dawson County reported on EIA Form 861 for 2018, 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 |
|---|---|---|---|---|---|
| WAPA-- Western Area Power Administration | - | - | - | - | - |
| Montana-Dakota Utilities Co | - | - | - | - | - |
| McCone Electric Coop Inc | - | - | - | - | - |
| Tongue River Electric Coop Inc | - | - | - | - | - |
| Goldenwest Electric Coop, Inc | - | - | - | - | - |
| Lower Yellowstone R E A, 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 16% of Montana's customers in 2018; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 7,435 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. Dawson County has data for 2017–2025.
Cite this report
MassOutage (massoutage.com), Dawson County, MT annual power outage report, 2018, 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/). https://massoutage.com/reports/2018/montana/dawson-county