(a) All public utilities shall file with the Commission copies of contracts with any affiliated or subsidiary holding, managing, operating, constructing, engineering, financing or purchasing company or agency, and when requested by the Commission, copies of contracts with any person selling service of any kind. The Commission may disapprove, after hearing, any such contract if it is found to be unjust or unreasonable, and made for the purpose or with the effect of concealing, transferring or dissipating the earnings of the public utility. Such contracts so disapproved by the Commission shall be void and shall not be carried out by the public utility which is a party thereto, nor shall any payments be made thereunder. Provided, however, that in the case of motor carriers of passengers this subsection shall apply only to such contracts as the Commission shall request such carriers to file.
(b) No public utility shall pay any fees, commissions or compensation of any description whatsoever to any affiliated or subsidiary holding, managing, operating, constructing, engineering, financing or purchasing company or agency for services rendered or to be rendered without first filing copies of all proposed agreements and contracts with the Commission and obtaining its approval. Provided, however, that this subsection shall not apply to motor carriers of passengers. (1931, c. 455; 1933, c. 134, s. 8; c. 307, s. 17; 1941, c. 97; 1963, c. 1165, s. 1.)