Metering data is provided as series of **power values**. These values represent the average power transferred during value periods of 15 minutes (also known as quarter-hour values).

We provide messages for a month with time series per day.

- The duration is presented as a number of minutes.
- The number of value periods contained in a schedule is therefore the duration/15
- The number of value periods in a “normal” day is therefore (24*60) / 15 = 96.