County annual report · FIPS 48397
2021 Rockwall County, TX Power Outage Report
In 2021, customers in Rockwall County, TX went without power for an average of 12.5 hours, a total of 961K customer-hours (Texas average 21.0 hours). That ranks 178th worst of 252 Texas counties and 658th 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 Rockwall 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 14, 2021 14:15 | February 21, 2021 13:45 | 6d 23h | 18,543 | 806K |
| 2 | March 17, 2021 10:45 | March 18, 2021 19:00 | 1d 8h | 11,740 | 39K |
| 3 | June 13, 2021 20:45 | June 15, 2021 00:15 | 1d 3h | 5,452 | 7,805 |
| 4 | April 14, 2021 12:15 | April 14, 2021 15:15 | 3h | 4,640 | 2,058 |
| 5 | July 2, 2021 02:00 | July 3, 2021 04:30 | 1d 2h | 4,065 | 16K |
| 6 | January 15, 2021 17:00 | January 16, 2021 03:00 | 10h | 3,855 | 1,011 |
| 7 | October 5, 2021 03:45 | October 5, 2021 06:15 | 2h 30m | 3,562 | 2,120 |
| 8 | December 18, 2021 09:45 | December 18, 2021 11:45 | 2h | 2,756 | 1,773 |
| 9 | June 17, 2021 15:30 | June 18, 2021 03:45 | 12h 15m | 1,940 | 3,913 |
| 10 | May 3, 2021 22:00 | May 4, 2021 23:45 | 1d 1h | 1,515 | 5,795 |
Outage episodes by size in 2021: 75 reached 100+ customers, 16 reached 1,000+ customers, 2 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 Rockwall 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 |
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 ÷ 77,029 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. Rockwall County has data for 2015, 2017–2025.
Cite this report
MassOutage (massoutage.com), Rockwall 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/rockwall-county