Maryland Code, Public Utilities § 3-203

(1) unconstitutional;

(2) outside the statutory authority or jurisdiction of the Commission;

(3) made on unlawful procedure;

(4) arbitrary or capricious;

(5) affected by other error of law; or

(6) if the subject of review is an order entered in a contested proceeding after a hearing, unsupported by substantial evidence on the record considered as a whole.