DAX to Evaluate Hourly time meter readings from cumulative readings

[garbafarhan]

Hi,

I have cumulative hourly meter readings (kWh) from 01/08/2018 00:00 to 31/08/2018 00:00 (https://1drv.ms/x/s!AntLmHOXlXNW0nkZHY4GZU8k3Mt5?e=bXWLuT)

Each of meter serial is unique and belongs to a certain feeder. what I want to achieve is to evaluate (using DAX column or a measure) for each meter in each feeder the hourly (kwh) from the cumulative i.e the difference between the hourly time steps readings. Thanks in advance.