Maryland Commercial Law Section 17-303

      The following funds held by any utility are presumed abandoned:

            (1)      Any deposit made by a subscriber with a utility to secure payment for, or any sum paid in advance for, utility services to be furnished in the State, less any lawful deduction, that has remained unclaimed by the person who appears on the records of the utility as entitled to it for more than 3 years after the termination of the services for which the deposit or advance payment was made;

            (2)      Any sum which a utility has been ordered to refund and which was received for utility services rendered in the State, together with any interest on it, less any lawful deduction, that has remained unclaimed by the person appearing on the records of the utility as entitled to it for more than 3 years after the date it became payable in accordance with the final determination or order providing for the refund; and

            (3)      Any sum paid to a utility for a utility service, which service has not been rendered within 3 years of the payment.