County annual report · FIPS 28063
2018 Jefferson County, MS Power Outage Report
In 2018, customers in Jefferson County, MS went without power for an average of 1.8 hours, a total of 7,355 customer-hours (Mississippi average 3.0 hours). That ranks 51st worst of 76 Mississippi counties and 1940th of 2,798 nationally.
Compared with MS, the US and 2017
Coverage line is EAGLE-I's share of Mississippi customers tracked each year.
Biggest outages in Jefferson County, 2018
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 7, 2018 10:30 | December 7, 2018 11:15 | 45m | 1,301 | 329 |
| 2 | November 30, 2018 00:15 | November 30, 2018 00:45 | 30m | 1,294 | 326 |
| 3 | December 3, 2018 10:30 | December 3, 2018 10:45 | 15m | 1,245 | 311 |
| 4 | July 7, 2018 00:30 | July 7, 2018 02:15 | 1h 45m | 389 | 593 |
| 5 | March 1, 2018 15:15 | March 1, 2018 20:30 | 5h 15m | 387 | 822 |
| 6 | July 30, 2018 21:15 | July 30, 2018 23:15 | 2h | 385 | 306 |
| 7 | September 10, 2018 13:15 | September 10, 2018 15:45 | 2h 30m | 385 | 868 |
| 8 | October 2, 2018 20:30 | October 2, 2018 23:30 | 3h | 382 | 494 |
| 9 | July 6, 2018 13:15 | July 6, 2018 15:45 | 2h 30m | 117 | 205 |
| 10 | June 22, 2018 15:00 | June 22, 2018 20:45 | 5h 45m | 98 | 491 |
Outage episodes by size in 2018: 9 reached 100+ customers, 3 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 2018, 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 | 2018 | 5.3 hrs | 1.81 | 4.2 hrs | 1.64 |
| Southwest Mississippi E P A | 2018 | 25.2 hrs | - | 22.9 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 66% of Mississippi's customers in 2018; 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, 2018, 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/2018/mississippi/jefferson-county