@Mushy This is likely tp be a combination of errors. I believe that the 30 day bill cost will only be correct after the new firmware has run for 30 days (as 'cost' was not recorded previously). So...

@Solla-topee Whilst I appreciate there are problems with the Tapo Plug Energy Monitoring 2.0 Update at present and that they are being investigated, can I ask a question that will become important at...

@Solla-topee Please consider exporting energy data for both external analysis and backup purposes should, for example a factory reset of the plug has to be done. A .csv export would be sufficient....

Logically I would expect the cost to be stored against each reading so that 'history' is not re-written when a rate change is introduced. If this is the case, then the figure could only calculate...

It actually appears worse than that... The Energy Monitor - Day is totally incorrect, as advised it shows yesterday, but only after the firmware update. The Energy Monitor - Month for October appears...