County annual report · FIPS 40045
2021 Ellis County, OK Power Outage Report
In 2021, customers in Ellis County, OK went without power for an average of 10.4 hours, a total of 26K customer-hours (Oklahoma average 3.2 hours). That ranks 4th worst of 77 Oklahoma counties and 755th of 2,974 nationally.
Compared with OK, the US and 2020
Coverage line is EAGLE-I's share of Oklahoma customers tracked each year.
Biggest outages in Ellis County, 2021
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 17, 2021 03:45 | March 18, 2021 04:00 | 1d | 827 | 6,774 |
| 2 | May 20, 2021 10:00 | May 20, 2021 14:45 | 4h 45m | 720 | 1,299 |
| 3 | February 10, 2021 07:15 | February 11, 2021 19:45 | 1d 12h | 471 | 3,377 |
| 4 | September 18, 2021 01:15 | September 18, 2021 07:00 | 5h 45m | 377 | 989 |
| 5 | February 12, 2021 18:15 | February 12, 2021 21:15 | 3h | 368 | 574 |
| 6 | February 16, 2021 09:30 | February 16, 2021 17:15 | 7h 45m | 357 | 1,291 |
| 7 | June 25, 2021 21:45 | June 26, 2021 07:45 | 10h | 338 | 1,305 |
| 8 | June 22, 2021 15:45 | June 22, 2021 16:15 | 30m | 335 | 168 |
| 9 | June 22, 2021 17:15 | June 22, 2021 18:00 | 45m | 335 | 168 |
| 10 | June 28, 2021 15:30 | June 28, 2021 23:00 | 7h 30m | 289 | 80 |
Outage episodes by size in 2021: 29 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 Ellis County reported on EIA Form 861 for 2021, 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 |
|---|---|---|---|---|---|
| Oklahoma Gas & Electric Co | - | - | - | - | - |
| Northwestern Electric Coop Inc - (OK) | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 93% of Oklahoma's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 2,488 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. Ellis County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Ellis County, OK annual power outage report, 2021, 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/2021/oklahoma/ellis-county