County annual report · FIPS 48339
2021 Montgomery County, TX Power Outage Report
In 2021, customers in Montgomery County, TX went without power for an average of 30.7 hours, a total of 7.1M customer-hours (Texas average 21.0 hours). That ranks 95th worst of 252 Texas counties and 290th 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 Montgomery 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 20:00 | February 24, 2021 10:45 | 9d 14h | 135,412 | 4.8M |
| 2 | November 10, 2021 07:45 | November 21, 2021 06:45 | 10d 23h | 35,588 | 70K |
| 3 | September 10, 2021 12:00 | September 21, 2021 10:00 | 10d 22h | 28,602 | 486K |
| 4 | October 27, 2021 12:00 | November 1, 2021 05:00 | 4d 17h | 13,227 | 144K |
| 5 | May 14, 2021 12:00 | May 27, 2021 07:45 | 12d 19h | 12,227 | 137K |
| 6 | May 1, 2021 05:15 | May 6, 2021 09:15 | 5d 4h | 10,835 | 67K |
| 7 | May 28, 2021 10:30 | June 23, 2021 07:15 | 25d 20h | 9,587 | 272K |
| 8 | December 18, 2021 12:15 | December 21, 2021 11:00 | 2d 22h | 7,287 | 39K |
| 9 | January 21, 2021 12:15 | January 23, 2021 07:00 | 1d 18h | 7,212 | 4,193 |
| 10 | January 18, 2021 13:45 | January 21, 2021 02:45 | 2d 13h | 7,209 | 15K |
Outage episodes by size in 2021: 148 reached 100+ customers, 74 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 Montgomery 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 |
| Sam Houston Electric Coop Inc | 2021 | 11.3 hrs | - | 4.3 hrs | - |
| San Bernard Electric Coop, Inc | 2021 | 2.4 hrs | 1.36 | 1.8 hrs | 1.22 |
| Mid-South Electric Coop Assn | - | - | - | - | - |
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 ÷ 230,040 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. Montgomery County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Montgomery 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/montgomery-county