You pay delivery system charges any time you use Oncor services. Oncor's delivery system charges (including the advance meter surcharge) are not a result of the installation of a DRG system. For information about pass-through charges from Oncor on your electric bill, you will need to contact your REP. Your REP should understand the components of Oncor's delivery service charges and should be able to explain them to you. If they do not, then your REP can contact Oncor for an explanation of the charges.