The directors and officers of any public utility as defined in § 56-232 shall file with the Commission a record of all officers and directorships and all sources of income in excess of $25,000 per year arising from voting securities in all other corporations which to the knowledge of the director or officer furnishes fuel with a value in excess of $50,000 per year to the public utility. Such records for the past year shall be filed or made current on or before September 1 of each year.