Self-reading allows you to have actual consumption on your bill, instead of estimated consumption, as long as it is sent correctly and during the periods reported on the last bill received.
How can I report self-reading?
You can report your meter self-reading free of charge:
What numbers do I need to provide for self-reading?
For direct-reading meters you must send only the black numbers
For clock meters you must provide the black clock numbers starting with the thousands (X1000), then the hundreds (X100), tens (X10) and finally the units.