(a) To specify what costs may be used for determining a public utility’s rate base, which balance the interests of consumers and investors;
(b) To prescribe the time period for measuring a public utility’s rate base;
(c) To specify allowable operating expenses, provided, however, that the commission shall exclude from a public utility’s allowable operating expenses any interest such utility paid, or credited, to its consumers in connection with refunds in a rate proceeding in which its rates were finally determined to be excessive;
(d) To determine accurately the capital costs of a public utility;
(e) To define specific costs which may be included by a public utility in its monthly fuel adjustment clause retail billings;
(f) To define specific costs which may be included by a public utility distributing gas in its monthly purchased gas adjustments retail billings;
(g) To prescribe minimal uniform standards of service for various classes of public utilities; and
(h) To provide for any other rules and regulations deemed by the commission to be appropriate for carrying out the provisions of this chapter.