County annual report · FIPS 48121
2021 Denton County, TX Power Outage Report
In 2021, customers in Denton County, TX went without power for an average of 19.6 hours, a total of 6.5M customer-hours (Texas average 21.0 hours). That ranks 142nd worst of 252 Texas counties and 441st 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 Denton 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 13:45 | February 21, 2021 11:45 | 6d 22h | 125,245 | 6.1M |
| 2 | October 28, 2021 09:30 | November 2, 2021 02:45 | 4d 17h | 8,607 | 50K |
| 3 | May 12, 2021 09:15 | May 13, 2021 21:30 | 1d 12h | 7,626 | 15K |
| 4 | February 22, 2021 13:30 | February 23, 2021 08:45 | 19h 15m | 6,072 | 9,640 |
| 5 | October 10, 2021 18:45 | October 12, 2021 16:00 | 1d 21h | 5,445 | 46K |
| 6 | June 12, 2021 11:15 | June 15, 2021 15:30 | 3d 4h | 3,931 | 17K |
| 7 | July 14, 2021 00:45 | July 14, 2021 05:45 | 5h | 3,193 | 1,833 |
| 8 | September 26, 2021 11:15 | September 26, 2021 22:45 | 11h 30m | 3,181 | 5,394 |
| 9 | May 26, 2021 13:45 | May 27, 2021 08:00 | 18h 15m | 2,885 | 3,733 |
| 10 | November 9, 2021 20:00 | November 10, 2021 03:15 | 7h 15m | 2,879 | 5,371 |
Outage episodes by size in 2021: 184 reached 100+ customers, 55 reached 1,000+ customers, 1 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 Denton 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 |
| Denton County Elec Coop, Inc | 2021 | 17.2 hrs | - | 41 min | 0.63 |
| Cooke County Elec Coop Assn | 2021 | 1.8 hrs | 1.06 | 1.8 hrs | - |
| City of Denton - (TX) | 2021 | 19.2 hrs | - | 41 min | 0.51 |
| Texas-New Mexico Power Co | - | - | - | - | - |
| Wise Electric Coop Inc | - | - | - | - | - |
| City of Sanger - (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 ÷ 332,707 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. Denton County has data for 2015, 2017–2025.
Cite this report
MassOutage (massoutage.com), Denton 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/denton-county