(a) If after investigation and hearing the rates or rules and regulations of any electric public utility governed by this act are found unjust, unreasonable, unfair, unjustly discriminatory or unduly preferential, or in any way in violation of the provisions of this act, or of any of the laws of the state of Kansas, the commission shall have the power to establish, and order substituted therefor, such rates or rules and regulations as the commission determines to be just, reasonable and necessary. If it is found that any rule and regulation, practice or act, relating to any service performed or to be performed by such electric public utility for the public is in any respect unreasonable, unjust, unfair, unreasonably inefficient or insufficient, unjustly discriminatory or unduly preferential, or otherwise in violation of this act or of any of the laws of the state of Kansas, the commission may substitute therefor such other rules and regulations, practice, service or act as the commission determines to be just, reasonable and necessary. For the purposes of determining just and reasonable rates, the commission may adopt a policy of disallowing a percentage, not to exceed 50%, of utility dues, donations and contributions to charitable, civic and social organizations and entities, in addition to disallowing specific dues, donations and contributions which are found unreasonable or inappropriate.

(b) All orders and decisions of the commission whereby any rates, rules and regulations, practice or acts relating to any service performed or to be performed by any electric public utility for the public are altered, changed, modified or established shall be reduced to writing, and a copy thereof, duly certified, shall be served on the electric public utility affected thereby. Such order and decision shall become operative and effective within 30 days after such service. Such electric public utility, unless an action is commenced in a court of proper jurisdiction to set aside the findings, orders and decisions of the commission, or to review and correct the same, shall carry the provisions of such order into effect.