Updated on 13/10/20: Missing smart meter readings or usage data on the online account are usually due to a temporary smart meter communication drop out. See this topic to diagnose meter comm issues with your Aclara or Honeywell/Elster(SMETS2) smart meter, and this topic for your Secure Liberty smart meter.
Half Hourly usage data missing (daily chart)
These section (which isn’t used in any of your billing or charges) is vulnerable to communication drop outs if something happens to prevent the meter sending your reading for that half hour period. For any missed half hourly periods, the usage will be averaged out once comms has been restored. This shows as a number of bars being the same size.
Daily usage data missing (monthly chart)
This section can also see communication drop outs, even if there’s half hourly data available that day. It needs a reading at around midnight to be able to populate that day’s usage. If you’re seeing missing usage on either meter for that day, see if any of the half hourly bars are missing for the end of the day. Communication is usually restored by itself, and any missed daily periods will be averaged out when this happens. This shows as a number of bars being the same size.
I, like a few others, have had ongoing problems with my daily usage for gas and electricity not displaying on certain days.
Last month there was no data for the last 6 days of June (i.e. from 25th to 30th) for both gas and electricity.
However, on the 1st July, the problem seemed to have resolved itself as the 'missing' data mysteriously appeared !