Me. Rev. Stat. tit. 20-A, § 3660

The courts of Maine shall have the same jurisdiction over the districts as though a Maine member district were a party instead of the interstate district. The service necessary to institute suit in Maine shall be made on the district by leaving a copy of the writ or other proceedings in hand or at the last and usual place of abode of one of the directors who resides in Maine, and by mailing a like copy to the clerk and to one other director by certified mail with return receipt requested.