Entergy Mississippi, Inc. operates as a regulated electric utility serving approximately 450,000 customers across 45 counties in Mississippi through the delivery of electricity generation, transmission, and distribution services; retail electric sales; and related energy management solutions. The company offers core products and services including base-load power generation from natural gas, coal, and nuclear facilities; high-voltage transmission infrastructure; local distribution networks; and customer programs for energy efficiency, demand response, and renewable integration such as solar interconnections. Entergy Mississippi functions within the electric utilities industry, targeting residential, commercial, industrial, and municipal customers primarily in central, southern, and southwestern Mississippi regions. Founded in 1924 as Mississippi Power & Light Company and headquartered in Jackson, Mississippi, it operates as a subsidiary of Entergy Corporation.
In recent developments, Entergy Mississippi completed a significant expansion of its solar portfolio with the addition of over 200 megawatts of new capacity through multiple utility-scale projects in 2024 and 2025, supporting Mississippi's clean energy transition. The company secured regulatory approval for a multi-year rate plan in late 2023 that facilitates grid modernization investments exceeding $1 billion, including advanced metering infrastructure and storm hardening measures. Additionally, Entergy Mississippi entered strategic partnerships with technology providers for battery energy storage systems and collaborated on federal grants for transmission upgrades amid growing data center demand in the Southeast.