(b) A municipal corporation furnishing a public utility service or
services need not decrease its rates and charges for such service or
services on order of the public service commission unless such order is
issued upon notice and after hearing instituted upon the verified
complaint in writing of not less than twenty-five of the active
consumers as shown by the records of the utility, residing in the
territory in which the utility rate or rates referred to in said
complaint is or are applicable.