County annual report · FIPS 47125
2021 Montgomery County, TN Power Outage Report
In 2021, customers in Montgomery County, TN went without power for an average of 2.1 hours, a total of 248K customer-hours (Tennessee average 3.7 hours). That ranks 49th worst of 84 Tennessee counties and 2198th of 2,974 nationally.
Compared with TN, the US and 2020
Coverage line is EAGLE-I's share of Tennessee 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 | December 11, 2021 03:00 | December 12, 2021 05:15 | 1d 2h | 5,914 | 24K |
| 2 | October 25, 2021 19:30 | October 25, 2021 23:45 | 4h 15m | 4,623 | 1,176 |
| 3 | June 3, 2021 00:30 | June 4, 2021 03:15 | 1d 2h | 4,550 | 27K |
| 4 | April 10, 2021 20:30 | April 11, 2021 03:30 | 7h | 4,257 | 3,957 |
| 5 | May 4, 2021 10:15 | May 5, 2021 06:45 | 20h 30m | 4,104 | 7,919 |
| 6 | December 6, 2021 05:15 | December 7, 2021 03:15 | 22h | 3,679 | 11K |
| 7 | May 23, 2021 12:30 | May 23, 2021 22:45 | 10h 15m | 3,609 | 10K |
| 8 | April 11, 2021 15:30 | April 11, 2021 20:00 | 4h 30m | 2,969 | 4,549 |
| 9 | January 1, 2021 17:30 | January 2, 2021 03:45 | 10h 15m | 2,958 | 3,141 |
| 10 | April 8, 2021 04:30 | April 8, 2021 11:00 | 6h 30m | 2,945 | 2,621 |
Outage episodes by size in 2021: 149 reached 100+ customers, 38 reached 1,000+ customers, 0 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 |
|---|---|---|---|---|---|
| City of Dickson | 2021 | 12.0 hrs | 6.34 | 5.6 hrs | 4.62 |
| City of Clarksville - (TN) | 2021 | 1.5 hrs | 0.85 | 60 min | 0.69 |
| Cumberland Elec Member Corp | - | - | - | - | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 73% of Tennessee's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 119,925 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, TN 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/tennessee/montgomery-county