How many customers does southwestern electric power company have? Southwestern Electric Power Company (SWEPCO) Profile 19,21,44,45. SWEPCO serves approximately 396,000 electric customers in a service area of some 25,000 square miles consisting of five Northwestern Louisiana parishes, Northeast Texas, and Western Arkansas.What are my payment options with southwestern electric? Here's a quick overview of your payment options: Manage your account and pay your bill with Southwestern Electric's online billing center. With our secure portal, you can view your billing and account history and make payments in your PJs from the comfort of your home.Where is southwestern power company located in louisiana? Southwestern Electric Power Company serves 543,400 customers in northwestern and central Louisiana, western Arkansas, East Texas and the Panhandle area of North Texas. Its headquarters are in Shreveport, La.How do i contact southwest gas customer service? See what Southwest Gas has to offer our residential customers. See what Southwest Gas has to offer our business customers. Call 911 and Southwest Gas immediately at 877-860-6020, whether you're a customer or not.