Service.
Section 57
SEC. 57. Service. — Every order made by the NEA shall be served upon the person or public service entity affected thereby within ten (10) days from the time said order is filed, by personal delivery or by ordinary mail, upon the attorney of record or, in case there be no attorney of record upon the party interested; and in case a certified copy is sent by registered mail, the registry mail receipt shall be prima facie evidence of the receipt of such order by the public service entity in due course of mail.