Designing and construction of highly reliable substation is very important because substation is an essential part of electrical system as it appropriately adjusts electrical voltage level for particular usage. To further enhance reliability of substation, Substation Automation Systems, usually called SAS, is invented to reduce communication time and human error during operation and maintenance. However, the cost of substation construction and SAS implementation is remarkably high. Also, the benefit of SAS to each configuration of substation is not equal. For this reason, economical worth of SAS implementation needs to be investigated. This thesis proposes the method to evaluate automated substation considering economical worth of SAS implementation to each configuration of substation in which all load points are equally important. Comparison of economical worth between substation with and without SAS implementation is presented. The economical worth of non-automated and automated substation is represented by NPV (Net Present Value) and IRR (Internal Rate of Return). The key factor which SAS helps improve the reliability of substation is the reduction of switching time of equipment in substation so that the healthiness of all load points can be quickly restored.