Idaho Code § 61-701
It is hereby made the duty of the commission to see that the provisions of the constitution and statutes of this state affecting public utilities, the enforcement of which is not specifically vested in some other officer or tribunal, are enforced and obeyed, and that violations thereof are promptly prosecuted and penalties due the state therefor recovered and collected and to this end it may sue in the name of the people of the state of Idaho. Upon the request of the commission, it shall be the duty of the attorney general or the prosecuting attorney of the proper county, to aid in any investigation, hearing or trial had under the provisions of this act and to institute and prosecute actions or proceedings for the enforcement of the provisions of the constitution and statutes of this state affecting the public utilities and for the punishment of all violations thereof.
Idaho Code § 61-701