Entergy Mississippi LLC

What This Utility Data Tells You

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.