Power outages in Mississippi
In 2025, the average Mississippi customer lost power for 8.4 hours (501.2 minutes, or 8 hours 21 minutes) over the year. That is about 1.9 times the US median of 4.3 hours (258.7 minutes), based on the 50 states compared.
Trend
Yearly outage time has fallen since the worst year, 2020, when the average customer was without power for 24.9 hours. It dropped to 7.5 hours in 2022, rose to 13.4 hours in 2023, then eased to 9.5 hours in 2024 and 8.4 hours in 2025.
Utilities in 2025
In 2025, East Mississippi Elec Pwr Assn had the lowest SAIDI at 5.95 minutes (about 0.1 hours). Southwest Mississippi E P A had the highest at 2,736.1 minutes (45.6 hours).
| Utility | Customers | Hours / yr | Interruptions |
|---|---|---|---|
| Southwest Mississippi E P A | 25,350 | 45.6 | — |
| Delta Electric Power Assn | 28,950 | 32.4 | 5.8 |
| Magnolia Electric Power Assn | 33,447 | 21.0 | — |
| Tallahatchie Valley E P A | 28,751 | 15.0 | 5.0 |
| Southern Pine Electric Cooperative | 70,472 | 10.8 | 5.5 |
| Entergy Mississippi LLC | 464,256 | 10.7 | 2.6 |
| Dixie Electric Power Assn - (MS) | 41,426 | 5.8 | 2.7 |
| Pearl River Valley El Pwr Assn | 54,018 | 4.9 | 3.8 |
| Northcentral Mississippi E P A | 35,275 | 4.1 | 1.5 |
| City of Columbus - (MS) | 12,609 | 2.7 | 1.0 |
| Singing River Elec Cooperative | 78,172 | 2.6 | — |
| City of Oxford - (MS) | 10,644 | 2.3 | 1.1 |
| Coast Electric Power Assn - (MS) | 91,460 | 2.0 | 1.7 |
| Mississippi Power Co | 192,650 | 1.8 | 1.0 |
| City of Starkville | 15,671 | 0.8 | 0.4 |
| North East Mississippi EPA | 29,909 | 0.4 | 5.0 |
| Alcorn County Elec Power Assn | 19,204 | 0.1 | 1.4 |
| East Mississippi Elec Pwr Assn | 12,974 | 0.1 | 2.6 |
What this means for backup power
For everyday outages, enter 3.2 hours in the calculator, which is the average length of one interruption. To ride out a year like 2020, size for 24.9 hours, the total outage time for that whole year.
FAQ
What does SAIDI mean?
SAIDI is the total time the average customer is without power in a year. It is not the length of one outage. In Mississippi in 2025 it was 8.4 hours.
How long does a typical outage last in Mississippi?
One interruption lasts about 3.2 hours on average. In 2025 the average customer had about 2.6 interruptions.
How many hours of backup power should I plan for?
For everyday outages, plan around 3.2 hours. If you want to cover a bad year like 2020, plan for 24.9 hours of total outage time. Enter either number in the calculator to see what size fits.
Utility pages
Source: U.S. EIA Form 861 Reliability file. Data snapshot 2026-11-05.