The Data Protection Act says that restrictions on the disclosure of personal data do not apply if the disclosure is required for the purpose of preventing, detecting or investigating offences, apprehending or prosecuting offenders or assessing or collecting any tax, duty or other moneys owed or payable to the State, a local authority or a health board.
So, the local authorities can request the data from the ESB, as I understand it, and ESB would be obliged by law to provide it.
Regards,
Fnergg