All grants, renewals, extensions or amendments of public utility franchises, whether it be so provided in the ordinance or not, shall be subject to the right of the city:
(a) To require proper and adequate extensions of plant and service, and the maintenance of the plant and fixtures at the highest practicable standard of efficiency;
(b) To establish reasonable standards of service and quality of products and prevent unjust discrimination in service or rates;
(c) To prescribe the form of accounts and at reasonable times to examine and audit the accounts and other records of such public utilities;
(d) To impose other reasonable regulations conducive to the safety, welfare and accommodation of the public.
Every public utility franchise hereafter granted shall be subject to the terms and conditions of this Charter, whether such terms and conditions are specifically mentioned in the franchise or not. No exclusive franchise or extension or renewal thereof shall ever be granted.