Expansion planning is crucial for meeting increased load in remote industrial areas, and this study explores an alternative approach of utilizing a converter to source power from an external system with different electrical frequencies. The comprehensive availability model of the converter, including derating, will affect the evaluation of adding a new power source to the industrial system. This study compares the scenario where only the existing generator provides power to comprehensively assess the effects of incorporating converters into this remote electricity system. The paper suggests evaluating reliability through the area index, the load point index aggregation. Graphs based on the area index show how placing converters enhances reliability in each system area. Calculations are performed with the help of DlgSILENT and consider the generator reliability and transmission topology. Adding a converter to the radially connected area will drastically improve reliability. The addition of a converter will also increase the overall system reliability. Reliability calculation with N-2 contingency provides clear information on converter placement's impact in each area. The converter addition to the system also reduced the interruption cost of the test system from 10.9 MUSD/a to 4.66 MUSD/a.