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The purpose of this master thesis is to develop a billing system for Saab's energy use and to study the possibilities for improving energy efficiencies. The billing system is based on collected measurement data and is divided into different categories. Obtained measurement data refer to one year in a pandemic between the years 2020 and 2021, which affects the results due to employees working from home as offices are closed. Furthermore, energy use must be normalized to be able to compare the energy use despite the temperature difference each month. Thereafter, normalized energy use is divided with the area for each house. The average value calculated for offices is 133 kWh/m2 compared to the general average value at 110 kWh/m2 and entails a high cost. The swingtherm plant consumes the most energy per square meter, over 2000 kWh/m2. The billing system is developed in Excel and implemented in Space. The billing model affects all internal tenants within Saab's operations. The possibilities for improving energy efficiencies have been studied and analyzed. Effective measures that are highlighted is an increased awareness, a change in the individual's behavior, integration of drill hole system, FTX system and installation of heat recovery and LED lights.