Feature request: report summary of data range


I don't know if addressed before, but I would like to do a report of kwh consumed in a date range.

For example I will like to see my electric bill compared to mesured with openenergymonitor, so I would like a report which lets me select my feed and dates for example from 15Jun to 14July, and it will summarize the ammount of kwh measured and could say the daily consumed or something like that.

Maybe I can modify a module, anyone can give me a clue??.