County annual report · FIPS 28063
2023 Jefferson County, MS Power Outage Report
In 2023, customers in Jefferson County, MS went without power for an average of 34.6 hours, a total of 139K customer-hours (Mississippi average 11.1 hours). That ranks 9th worst of 79 Mississippi counties and 189th of 2,977 nationally.
Compared with MS, the US and 2022
Coverage line is EAGLE-I's share of Mississippi customers tracked each year.
Biggest outages in Jefferson County, 2023
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | June 27, 2023 03:30 | July 1, 2023 09:45 | 4d 6h | 2,919 | 23K |
| 2 | June 14, 2023 11:30 | June 20, 2023 18:45 | 6d 7h | 2,262 | 37K |
| 3 | July 16, 2023 23:00 | July 18, 2023 02:45 | 1d 3h | 1,516 | 11K |
| 4 | September 7, 2023 22:45 | September 17, 2023 19:15 | 9d 20h | 1,352 | 13K |
| 5 | December 6, 2023 23:45 | December 7, 2023 00:00 | 15m | 1,339 | 335 |
| 6 | June 12, 2023 20:30 | June 13, 2023 02:45 | 6h 15m | 1,083 | 2,345 |
| 7 | November 20, 2023 23:00 | November 22, 2023 16:15 | 1d 17h | 1,048 | 8,066 |
| 8 | January 24, 2023 22:30 | January 27, 2023 18:15 | 2d 19h | 847 | 3,614 |
| 9 | December 6, 2023 09:30 | December 6, 2023 16:30 | 7h | 649 | 548 |
| 10 | April 8, 2023 09:45 | April 9, 2023 00:00 | 14h 15m | 648 | 1,661 |
Outage episodes by size in 2023: 43 reached 100+ customers, 7 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 2023, 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 | 2023 | 20.0 hrs | 2.14 | 4.9 hrs | 1.52 |
| Southwest Mississippi E P A | 2023 | 37.6 hrs | - | 21.7 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 n/a of Mississippi's customers in 2023; 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, 2023, 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/2023/mississippi/jefferson-county