IOU · Mississippi · EIA 12685
Entergy Mississippi LLC
IOU · Mississippi · 460K customers. According to the U.S. Energy Information Administration's EIA Form 861, reliability for 2023 shows SAIDI 1201 minutes/customer.
Reliability verdict
Entergy Mississippi LLC shows near-benchmark chronic reliability in 2023: 291 minutes SAIDI excluding major events (1201 minutes including them) across 460K customers.
- 1201 min
- SAIDI 2023
- 2.14
- SAIFI 2023
- 291 min
- SAIDI ex-MED
- 460K
- Customers
Chronic reliability judged on SAIDI excluding major event days when reported (IEEE 1366). Source: EIA Form 861 · August 2026.
Signature read: long interruption minutes vs the 911 utility cohort (>258 min tercile cut).
What long-outage Entergy Mississippi LLC filings show
Entergy Mississippi LLC is an investor-owned utility operating in Mississippi under EIA identifier 12685. It reports service to approximately 460,082 customer accounts and generated about $1.63 billion in annual electric revenue, with a service footprint spanning 238 ZIP codes. As an investor-owned utility, it operates under state public utility commission oversight that reviews rate cases and reliability performance.
In 2023, the average Entergy Mississippi LLC customer experienced 1201.2 minutes of power interruptions, a measure known as SAIDI, or System Average Interruption Duration Index. Excluding major weather events from that total, that lands within the usual 120–180 minute national benchmark band, roughly on par with typical U.S. distribution-utility performance. The SAIFI figure, which tracks average outage events per customer, came in at 2.14 for the same period, meaning customers statistically saw about 2 distinct interruptions that year. Strip out major event days (hurricanes, ice storms) and SAIDI falls to 291.4 minutes; the difference from the headline 1201.2 shows how much of the outage total came from weather rather than everyday grid issues.
The EIA dataset includes 4 years of continuous reporting (2020–2023) for Entergy Mississippi LLC, which lets you see whether reliability is trending up or down rather than judging from a single snapshot. SAIDI climbed from 999.1 to 1201.2 minutes over that window, a shift that can point to worsening weather exposure or delayed grid modernization.
Based on this utility's own EIA Form 861 reliability record -- baseline (major-event- excluded) outage duration, total outage duration, and outage frequency -- each benchmarked against every reporting utility nationwide. Not a measure of electricity rates or customer service, which this portal does not track.
1201 minutes per customer per year
Annual minutes without electric service (2023)
SAIDI by year (2020-2023)
Minutes per customer-year · EIA Form 861
Year-by-year SAIDI for Entergy Mississippi LLC from the same EIA filings as the table below. Lower is better; major-event years can spike the headline figure.
Entergy Mississippi LLC SAIDI trend
Entergy Mississippi LLC vs the nationwide SAIDI distribution
Where this utility's headline SAIDI sits among every EIA Form 861 utility with a reported figure
1,201 Higher than most fewer outage minutes than 5% of 911 utilities
Utilities nationwide, banded by latest reported SAIDI (minutes)
Each bar is a band; taller bars hold more utilities. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source U.S. EIA Form 861 reliability filings · August 2026
Price vs. reliability
Where Entergy Mississippi LLC sits on price vs. reliability
Among the 781 U.S. utilities large enough to report both revenue per customer and a recent outage record, Entergy Mississippi LLC charges more per customer than 88% of them, and is more reliable (lower SAIDI) than 6% of them, placing it in the quadrant where it pays more but is LESS reliable, a premium price without a reliability payoff. Revenue per customer and outage minutes are independent figures: paying more does not guarantee fewer outages.
Revenue per customer: $3,545/year · Latest SAIDI: 1201.2 minutes/year.
SAIDI 2023 breakdown: 1201.2 minutes
Reliability Trend (2020–2023)
| Year | SAIDI (min) | SAIDI nMED | SAIFI | Customers |
|---|---|---|---|---|
| 2020 | 999.1 | 230.9 | 2.279 | 461,025 |
| 2021 | 1374.0 | 281.9 | 2.438 | 464,740 |
| 2022 | 734.8 | 331.2 | 2.380 | 465,591 |
| 2023 | 1201.2 | 291.4 | 2.142 | 466,211 |
SAIDI nMED = SAIDI without major event days. Source: EIA Form 861.
Service Area
Entergy Mississippi LLC serves 238 ZIP codes in Mississippi.
Frequently Asked Questions
How reliable is Entergy Mississippi LLC?
Entergy Mississippi LLC had a SAIDI of 1201.2 minutes in 2023 including major weather events, but 291.4 minutes excluding them (the IEEE-standard measure of day-to-day reliability, the gap reflects a major storm that year, not chronic performance). Excluding major weather events, this is near the national average.
What type of utility is Entergy Mississippi LLC?
Entergy Mississippi LLC is classified as a IOU serving Mississippi.
How many customers does Entergy Mississippi LLC serve?
Entergy Mississippi LLC serves approximately 460,082 customers in Mississippi.
How has Entergy Mississippi LLC's reliability changed over time?
Entergy Mississippi LLC has 4 years of reliability data (2020-2023). This utility's SAIDI has stayed fairly flat over the period. Review the trend table above for year-by-year detail.
Utility Profile
- Type
- IOU
- State
- Mississippi
- Customers
- 460,082
- Annual Revenue
- $1.63B
- EIA ID
- 12685
Explore
Utilities with similar EIA profiles
Two cross-state peer sets for Entergy Mississippi LLC. Same-state SAIDI neighbors stay in Read-with below; these neighborhoods are nearest other-state utilities with at least 10,000 reported customers.
Similar customer count
Nearest utilities by Form 861 customers (460K here), outside Mississippi.
Similar chronic SAIDI
Nearest utilities by latest SAIDI minutes (1201.2 here), outside Mississippi, excluding the customer-peer set.
Source: U.S. Energy Information Administration Form 861 annual electric power industry survey · ZIP service territory: OpenEI. Disclaimer: informational only, not professional advice. See full disclaimer · methodology.