CPE can be found on any electricity bill, regardless of the supplier with whom you have contracted the delivery service. Alternatively, if you do not have an invoice, you may request, that information from your electricity distributor network operator in the region to which the address of the location to be supplied belongs.
In most cases, this is EDP Distribuição, so you should contact the Technical Assistance Line 808 100 100 and indicate the serial number of the meter that is present in your electric meter.