The rule is 13 digit electric account number.

Due to the system upgrade, the 13 digit electric account number needs to be preceded by 320, from 10 digit to 13 digit. The query information shows that due to the system upgrade, it is necessary to add 320 before the original account number, from the original 10 to 13. Before the system upgrade, the electricity recharge business was suspended, and the Jiangsu electric power account was upgraded from 10 to 13, with only 65,438 complete digits. The 10 digit of the electric meter is the user number of the electric meter. If you want to know the user number of your electricity meter, you can call the power supply service hotline directly. If there is a power purchase invoice paid by the power business hall, the customer number on the invoice is the user number of the electric meter.