County annual report · FIPS 28063
2020 Jefferson County, MS Power Outage Report
In 2020, customers in Jefferson County, MS went without power for an average of 84.9 hours, a total of 342K customer-hours (Mississippi average 18.5 hours). That ranks 6th worst of 79 Mississippi counties and 81st of 3,019 nationally.
Compared with MS, the US and 2019
Coverage line is EAGLE-I's share of Mississippi customers tracked each year.
Biggest outages in Jefferson County, 2020
The 10 outage episodes with the most customers out at once. Times are UTC.
| # | Started (UTC) | Ended (UTC) | Duration | Peak out | Customer-hours |
|---|---|---|---|---|---|
| 1 | October 9, 2020 22:45 | October 23, 2020 14:00 | 13d 15h | 4,396 | 193K |
| 2 | March 4, 2020 00:15 | April 1, 2020 00:45 | 28d | 2,665 | 19K |
| 3 | September 12, 2020 19:45 | September 26, 2020 01:15 | 13d 5h | 2,645 | 2,628 |
| 4 | April 23, 2020 01:00 | May 2, 2020 15:45 | 9d 14h | 1,980 | 30K |
| 5 | June 5, 2020 17:45 | June 5, 2020 18:15 | 30m | 1,324 | 348 |
| 6 | January 17, 2020 00:45 | March 3, 2020 23:30 | 46d 22h | 1,242 | 29K |
| 7 | July 31, 2020 23:00 | August 1, 2020 20:00 | 21h | 893 | 2,640 |
| 8 | August 27, 2020 13:00 | August 29, 2020 16:45 | 2d 3h | 837 | 17K |
| 9 | August 14, 2020 17:00 | August 15, 2020 01:30 | 8h 30m | 788 | 1,735 |
| 10 | June 25, 2020 21:45 | June 25, 2020 23:15 | 1h 30m | 748 | 375 |
Outage episodes by size in 2020: 43 reached 100+ customers, 6 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 2020, 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 | 2020 | 16.7 hrs | 2.28 | 3.8 hrs | 1.38 |
| Southwest Mississippi E P A | 2020 | 80.2 hrs | - | 22.6 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 2020; 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, 2020, 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/2020/mississippi/jefferson-county