(2) Any investigation, hearing or other proceeding involving the issuance of an order of the commission that has not been finally determined when a transfer of any interests of a person is effected may be continued and finally determined, notwithstanding any such transfer of interest. Any order issued in such investigation, hearing or other proceeding is binding upon the successors in interest. [1971 c.655 §54; 1973 c.776 §31; 1987 c.447 §93; 1995 c.733 §71]