Usage is measured in Half Hourly increments.
In your supplied data file the first reading for the day is from 00:00 till 00:30.
Agl seems to be implying that your usage is from 00:00 till 01:00.
Checking my File shows this to be true (except that it is wrong because I am in SA and they do not allow for the time difference).
To be correct the chart should start at 01:00 and finish at 00:00 (23:59 to be technically correct) thus showing your usage for the hour.
So the answer to your question is:
At data point 7pm it is showing usage from 7pm till 8pm
Cheers Neil
Cheers Neil
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