PT PLN (Persero) Rayon Semarang Timur is one of the public services sector, which is currently receiving a lot of attention and complaints from its consumers. One of the efforts of PT PLN (Persero) in dealing with complaints was to launch an application, the Integrated Complaints Applications (APKT). The implementation the Integrated Complaints Applications (APKT) serves to facilitate its consumers to let the company know their. This study used descriptive analysis. This study uses the theory of DeLone & McLean, it is the analysis of the success of the application system. The purposes of this study are to describe the Integrated Complaints Applications (APKT) and to analyze the success of the application system as well as its obstacles that occur in the Integrated Complaints Applications (APKT). The application systems are rated with the six dimensions. There are: system quality, information quality, service quality, use, user satisfaction, and net benefit. The Integrated Complaints Applications (APKT) is applied successfully at PT PLN (Persero) Rayon Semarang Timur because its can facilitate the work of employees in handling complaint.