County annual report · FIPS 48113
2021 Dallas County, TX Power Outage Report
In 2021, customers in Dallas County, TX went without power for an average of 20.6 hours, a total of 19.6M customer-hours (Texas average 21.0 hours). That ranks 133rd worst of 252 Texas counties and 417th 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 Dallas 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 8, 2021 12:30 | March 4, 2021 07:45 | 23d 19h | 358,650 | 16.8M |
| 2 | March 13, 2021 12:15 | March 20, 2021 07:30 | 6d 19h | 45,909 | 208K |
| 3 | October 24, 2021 10:15 | November 1, 2021 10:30 | 8d | 28,904 | 367K |
| 4 | September 19, 2021 06:45 | October 21, 2021 02:00 | 31d 19h | 23,485 | 296K |
| 5 | April 28, 2021 09:15 | May 13, 2021 10:30 | 15d 1h | 18,072 | 197K |
| 6 | July 21, 2021 11:15 | August 28, 2021 06:00 | 37d 18h | 10,018 | 354K |
| 7 | May 31, 2021 11:45 | June 10, 2021 10:15 | 9d 22h | 8,735 | 82K |
| 8 | June 28, 2021 09:15 | July 8, 2021 07:45 | 9d 22h | 7,042 | 85K |
| 9 | February 3, 2021 08:45 | February 4, 2021 06:15 | 21h 30m | 6,792 | 7,556 |
| 10 | January 22, 2021 13:30 | February 1, 2021 09:45 | 9d 20h | 5,494 | 65K |
Outage episodes by size in 2021: 73 reached 100+ customers, 52 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 Dallas 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 |
| Farmers Electric Coop, Inc - (TX) | 2021 | 13.2 hrs | - | 52 min | 0.86 |
| Trinity Valley Elec Coop Inc | 2021 | 18.0 hrs | - | 3.5 hrs | 2.31 |
| HILCO Electric Cooperative, Inc. | 2021 | 13.4 hrs | 3.49 | 1.6 hrs | 0.85 |
| Texas-New Mexico Power Co | - | - | - | - | - |
| City of Garland - (TX) | - | - | - | - | - |
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 ÷ 948,355 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. Dallas County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Dallas 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/dallas-county