County annual report · FIPS 48439
2021 Tarrant County, TX Power Outage Report
In 2021, customers in Tarrant County, TX went without power for an average of 20.1 hours, a total of 20.9M customer-hours (Texas average 21.0 hours). That ranks 140th worst of 252 Texas counties and 430th of 2,974 nationally.
Compared with TX, the US and 2020
Coverage line is EAGLE-I's share of Texas customers tracked each year.
Biggest outages in Tarrant 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 | February 11, 2021 13:00 | February 28, 2021 05:30 | 16d 16h | 367,316 | 18.6M |
| 2 | July 21, 2021 10:15 | July 31, 2021 08:15 | 9d 22h | 23,847 | 61K |
| 3 | October 24, 2021 11:30 | November 6, 2021 11:45 | 13d | 22,977 | 278K |
| 4 | July 31, 2021 09:00 | August 8, 2021 09:45 | 8d | 20,012 | 182K |
| 5 | October 10, 2021 12:15 | October 12, 2021 11:45 | 1d 23h | 14,981 | 79K |
| 6 | November 25, 2021 06:15 | November 28, 2021 12:15 | 3d 6h | 10,080 | 37K |
| 7 | August 13, 2021 12:15 | August 28, 2021 08:00 | 14d 19h | 9,671 | 167K |
| 8 | May 10, 2021 12:45 | May 20, 2021 07:15 | 9d 18h | 8,347 | 122K |
| 9 | May 31, 2021 09:00 | June 25, 2021 07:30 | 24d 22h | 7,283 | 167K |
| 10 | January 7, 2021 13:30 | January 17, 2021 21:15 | 10d 7h | 6,376 | 47K |
Outage episodes by size in 2021: 82 reached 100+ customers, 62 reached 1,000+ customers, 6 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 Tarrant 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 |
|---|---|---|---|---|---|
| Oncor Electric Delivery Company LLC | 2017 | 3.4 hrs | 1.69 | 2.4 hrs | 1.49 |
| Tri-County Electric Coop, Inc (TX) | 2021 | 31.8 hrs | 3.38 | 5.5 hrs | 2.89 |
| United Electric Coop Service Inc - (TX) | 2021 | 13.5 hrs | - | 3.1 hrs | 2.07 |
| Denton County Elec Coop, Inc | 2021 | 17.2 hrs | - | 41 min | 0.63 |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 94% of Texas's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 1,040,761 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. Tarrant County has data for 2015, 2017–2025.
Cite this report
MassOutage (massoutage.com), Tarrant County, TX 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/texas/tarrant-county