(1) Upon petition or its own motion, the commission may conduct a limited proceeding to consider and act upon any matter within its jurisdiction, including any matter the resolution of which requires a public utility to adjust its rates to consist with the provisions of this chapter. The commission shall determine the issues to be considered during such a proceeding and may grant or deny any request to expand the scope of the proceeding to include other matters.
(2) The commission may adopt rules for the determination of rates in full revenue requirement proceedings which rules provide for adjustments of rates based on revenues and costs during the period new rates are to be in effect and for incremental adjustments in rates for subsequent periods.
