This function is to gather statistics year, week and yearly. See picture. It's shipped with the Centraline plugin clHVACEnergyManagement:CmTTB_Statistics

You can input 2 values, EnergyIn and PowerIn. Energy is a raising value for e.g. used kW/H Power is a current flow value.

Remember to set settings like below and set whether to use power or energy. If you want to reset statistics, set SYS-04 to 1 and save. Then set all input fields to desired value and press save. (This worked for me)