County annual report · FIPS 40141
2021 Tillman County, OK Power Outage Report
In 2021, customers in Tillman County, OK went without power for an average of 7.5 hours, a total of 25K customer-hours (Oklahoma average 3.2 hours). That ranks 9th worst of 77 Oklahoma counties and 986th 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 Tillman 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 | September 16, 2021 20:15 | September 17, 2021 01:15 | 5h | 2,705 | 6,097 |
| 2 | February 12, 2021 15:30 | February 12, 2021 17:30 | 2h | 759 | 536 |
| 3 | January 1, 2021 08:30 | January 1, 2021 14:30 | 6h | 621 | 3,487 |
| 4 | July 11, 2021 05:15 | July 11, 2021 09:15 | 4h | 619 | 1,838 |
| 5 | October 22, 2021 04:15 | October 22, 2021 09:30 | 5h 15m | 605 | 3,176 |
| 6 | January 30, 2021 16:15 | January 30, 2021 18:45 | 2h 30m | 592 | 1,333 |
| 7 | March 17, 2021 18:00 | March 17, 2021 19:30 | 1h 30m | 506 | 486 |
| 8 | March 19, 2021 00:15 | March 19, 2021 01:45 | 1h 30m | 303 | 451 |
| 9 | June 16, 2021 15:00 | June 16, 2021 17:30 | 2h 30m | 241 | 603 |
| 10 | August 4, 2021 03:45 | August 4, 2021 11:15 | 7h 30m | 241 | 1,808 |
Outage episodes by size in 2021: 13 reached 100+ customers, 1 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 Tillman 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 |
|---|---|---|---|---|---|
| Public Service Co of Oklahoma | 2021 | 2.3 hrs | 1.39 | 1.9 hrs | 1.21 |
| Cotton Electric Coop, Inc | 2021 | 3.5 hrs | 2.32 | 2.8 hrs | 1.79 |
| Southwest Rural Elec Assn Inc | - | - | - | - | - |
| City of Frederick - (OK) | - | - | - | - | - |
| City of Manitou - (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 ÷ 3,295 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. Tillman County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Tillman 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/); EIA Form 861 (utility reliability) (https://www.eia.gov/electricity/data/eia861/). https://massoutage.com/reports/2021/oklahoma/tillman-county