County annual report · FIPS 47157
2021 Shelby County, TN Power Outage Report
In 2021, customers in Shelby County, TN went without power for an average of 7.2 hours, a total of 3.1M customer-hours (Tennessee average 3.7 hours). That ranks 17th worst of 84 Tennessee counties and 1009th 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 Shelby 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 10, 2021 11:45 | December 16, 2021 12:15 | 6d | 30,282 | 743K |
| 2 | March 25, 2021 09:30 | March 30, 2021 06:00 | 4d 20h | 22,695 | 187K |
| 3 | September 30, 2021 04:30 | October 7, 2021 03:30 | 6d 23h | 19,658 | 96K |
| 4 | November 20, 2021 09:45 | November 21, 2021 04:30 | 18h 45m | 18,986 | 17K |
| 5 | June 10, 2021 10:30 | June 16, 2021 09:00 | 5d 22h | 14,380 | 80K |
| 6 | February 11, 2021 00:45 | February 18, 2021 03:30 | 7d 2h | 12,564 | 191K |
| 7 | January 22, 2021 07:15 | January 25, 2021 13:30 | 3d 6h | 11,199 | 10K |
| 8 | December 23, 2021 12:00 | December 28, 2021 11:30 | 4d 23h | 10,588 | 37K |
| 9 | March 30, 2021 09:30 | April 1, 2021 07:45 | 1d 22h | 9,557 | 29K |
| 10 | May 2, 2021 11:45 | May 18, 2021 09:30 | 15d 21h | 8,490 | 134K |
Outage episodes by size in 2021: 174 reached 100+ customers, 110 reached 1,000+ customers, 8 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 Shelby 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 Memphis - (TN) | 2021 | 5.4 hrs | 2.10 | 5.3 hrs | 2.00 |
| Southwest Tennessee E M C | - | - | - | - | - |
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 ÷ 422,904 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. Shelby County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Shelby 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/shelby-county