Much like Old Man River that "just keeps rolling along" Entergy Mississippi keeps electricity flowing across the Magnolia state. With a physical presence in 45 of the state's 82 counties, the utility provides electricity to about 440,000 residential, business, and institutional customers (roughly 16% of electric customers in Mississippi) throughout the western half of its namesake state. Residential customers account for more than 90% of the company's client base. Entergy Mississippi is a subsidiary of the Louisiana-based utility holding company Entergy.