Does Southern Federal Power Serve My AEP Texas Central ZIP Code? Southern Federal Power offers residential electricity plans in many South Texas ZIP codes served by the AEP Texas Central Division. To check your location, visit SouthernFederal.com, enter the ZIP code for your service address and review the plans currently available. A matching ZIP code is only the first step. Utility boundaries do not always follow ZIP-code or city boundaries. Your complete service address provides the final confirmation that AEP Texas Central serves the location. What Is the AEP Texas Central Service Area? AEP Texas is a regulated Transmission and Distribution Utility, commonly [...]