County annual report · FIPS 48201
2021 Harris County, TX Power Outage Report
In 2021, customers in Harris County, TX went without power for an average of 11.7 hours, a total of 21.5M customer-hours (Texas average 21.0 hours). That ranks 181st worst of 252 Texas counties and 692nd 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 Harris 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 | January 1, 2021 00:00 | June 28, 2021 09:00 | 178d 9h | 455,986 | 17.8M |
| 2 | September 5, 2021 13:00 | October 18, 2021 09:00 | 42d 20h | 118,851 | 2.5M |
| 3 | October 21, 2021 05:16 | November 1, 2021 10:30 | 11d 5h | 28,530 | 337K |
| 4 | June 28, 2021 09:45 | August 2, 2021 08:15 | 34d 22h | 10,838 | 291K |
| 5 | August 10, 2021 13:15 | August 20, 2021 07:45 | 9d 18h | 9,852 | 128K |
| 6 | December 9, 2021 12:00 | December 16, 2021 08:30 | 6d 20h | 6,772 | 41K |
| 7 | December 16, 2021 09:15 | December 31, 2021 00:15 | 14d 15h | 5,394 | 58K |
| 8 | November 1, 2021 11:30 | December 1, 2021 12:15 | 30d | 4,330 | 133K |
| 9 | December 5, 2021 13:00 | December 7, 2021 07:15 | 1d 18h | 3,717 | 11K |
| 10 | August 23, 2021 11:30 | September 5, 2021 12:15 | 13d | 2,288 | 87K |
Outage episodes by size in 2021: 19 reached 100+ customers, 17 reached 1,000+ customers, 4 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 Harris 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 |
|---|---|---|---|---|---|
| Entergy Texas Inc. | 2021 | 16.7 hrs | 3.31 | 4.7 hrs | 2.02 |
| CenterPoint Energy | 2021 | 39.4 hrs | 4.67 | 2.5 hrs | 1.42 |
| San Bernard Electric Coop, Inc | 2021 | 2.4 hrs | 1.36 | 1.8 hrs | 1.22 |
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 ÷ 1,827,686 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. Harris County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Harris 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/harris-county