(1) A utility must file a comprehensive, long-term portfolio management and electricity supply resource procurement plan by December 15 in each odd-numbered year.

(2) As necessary, a utility's periodic electricity supply cost tracking filings should include the information, analyses, and documentation recommended in these guidelines to support its request for cost recovery related to electricity supply cost additions or changes.

(3) A periodic cost tracking filing should document the status of on-going portfolio planning, management, and electricity supply resource procurement activities and include rolling three-year action plans. Action plans should include a discussion of activities involving transmission and distribution functions and services.

(4) The commission may implement a utility's periodic electricity supply cost recovery request on an interim basis, subject to retroactive adjustment, to allow adequate time to process such requests and render a final order.