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AGL provides the USAGE data on a chart as hourly, daily, monthly etc.
I would like to know for the HOURLY chart, if the point of data showing kwh and $ applies to the next hour period or for the previous hour period.
So the useage data point at eg 7pm - is it for usage between 6pm-7pm, or is it for between 7pm-8pm?
The chart goes from 1200 midnight to 11pm, so it seems the data is for the next hour period.
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