County annual report · FIPS 28063
2025 Jefferson County, MS Power Outage Report
In 2025, customers in Jefferson County, MS went without power for an average of 51.6 hours, a total of 208K customer-hours (Mississippi average 7.5 hours). That ranks 3rd worst of 81 Mississippi counties and 78th of 3,000 nationally.
Compared with MS, the US and 2024
Coverage line is EAGLE-I's share of Mississippi customers tracked each year.
Biggest outages in Jefferson County, 2025
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | August 18, 2025 21:00 | August 19, 2025 23:00 | 1d 2h | 2,103 | 16K |
| 2 | February 15, 2025 19:00 | February 19, 2025 01:15 | 3d 6h | 1,745 | 30K |
| 3 | May 9, 2025 12:30 | June 10, 2025 14:30 | 32d 2h | 1,189 | 37K |
| 4 | February 19, 2025 06:30 | February 19, 2025 18:45 | 12h 15m | 1,065 | 5,105 |
| 5 | June 17, 2025 14:00 | July 2, 2025 19:00 | 15d 5h | 938 | 12K |
| 6 | April 9, 2025 13:15 | May 8, 2025 21:45 | 29d 8h | 929 | 27K |
| 7 | June 11, 2025 00:00 | June 13, 2025 15:30 | 2d 15h | 794 | 6,752 |
| 8 | October 26, 2025 20:15 | October 26, 2025 21:00 | 45m | 780 | 585 |
| 9 | July 21, 2025 14:00 | July 26, 2025 14:45 | 5d | 689 | 4,857 |
| 10 | April 5, 2025 15:30 | April 8, 2025 21:15 | 3d 5h | 684 | 6,291 |
Outage episodes by size in 2025: 41 reached 100+ customers, 4 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 2025, 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 | 2024 | 11.5 hrs | 2.31 | 5.5 hrs | 1.75 |
| Southwest Mississippi E P A | 2024 | 61.2 hrs | - | 29.2 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 2025; 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, 2025, 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/2025/mississippi/jefferson-county