Sumter Electric Cooperative, Inc. (SECO Energy) Sumter Electric Cooperative, Inc. (SECO Energy) Search | Advanced Search | New Members | Coupons and Discounts | All Categories   Other >> Electric Power Distribution Sumter Electric Cooperative, Inc. (SECO Energy) PO Box 301Sumterville, FL 33585 352-793-3801 | fax: (352) 793-6603 Visit Site