© 2021 Chamber of Turkish Electrical Engineers.Nowadays, with the increase in energy demand, many techniques penetrate into both the producer and consumer sides. One of the most important of these techniques is energy management. In this study, energy management, which is the umbrella term, is discussed as energy planning take as references ISO 50001, and optimal tariff management. Case studies are conducted for identifying optimal electricity tariffs. Results show that invoice costs can be saved at the rate of 2.93-3.71% by optimal tariff management that does not require any investment costs.