County annual report · FIPS 28063
2021 Jefferson County, MS Power Outage Report
In 2021, customers in Jefferson County, MS went without power for an average of 144.5 hours, a total of 582K customer-hours (Mississippi average 17.2 hours). That ranks 1st worst of 78 Mississippi counties and 43rd of 2,974 nationally.
Compared with MS, the US and 2020
Coverage line is EAGLE-I's share of Mississippi customers tracked each year.
Biggest outages in Jefferson 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 17, 2021 19:45 | April 8, 2021 22:45 | 50d 3h | 4,393 | 466K |
| 2 | August 30, 2021 00:30 | September 10, 2021 19:30 | 11d 19h | 2,069 | 42K |
| 3 | May 4, 2021 19:45 | May 6, 2021 16:30 | 1d 20h | 1,403 | 7,730 |
| 4 | July 20, 2021 15:30 | July 20, 2021 20:00 | 4h 30m | 1,329 | 363 |
| 5 | December 30, 2021 23:15 | December 31, 2021 00:15 | 1h | 1,266 | 1,266 |
| 6 | May 21, 2021 18:30 | July 19, 2021 16:30 | 58d 22h | 768 | 29K |
| 7 | April 10, 2021 04:00 | April 13, 2021 15:30 | 3d 11h | 751 | 8,239 |
| 8 | July 30, 2021 21:45 | August 16, 2021 19:15 | 16d 21h | 447 | 4,177 |
| 9 | July 19, 2021 18:15 | July 20, 2021 01:00 | 6h 45m | 394 | 528 |
| 10 | April 24, 2021 01:45 | April 28, 2021 15:45 | 4d 14h | 367 | 4,884 |
Outage episodes by size in 2021: 27 reached 100+ customers, 5 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 Jefferson 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 Mississippi LLC | 2021 | 22.9 hrs | 2.44 | 4.7 hrs | 1.50 |
| Southwest Mississippi E P A | 2021 | 108.4 hrs | - | 20.5 hrs | - |
About this data
- Outage figures come from DOE/ORNL EAGLE-I, which records customers out by county every 15 minutes. EAGLE-I tracked about 77% of Mississippi's customers in 2021; utilities it does not see are not counted.
- Hours per customer = outage customer-minutes ÷ 4,028 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. Jefferson County has data for 2015–2025.
Cite this report
MassOutage (massoutage.com), Jefferson County, MS 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/mississippi/jefferson-county