(1) The commission will docket the utility's cost of service filings made pursuant to ARM 38.5.604 as a contested case proceeding regardless of whether the utility applies for a change in rates, and:

(a) If the utility does not file an application to change its rates, it shall file an application for summary closure of the docket.

(b) The commission will notice the application for summary closure in accordance with the provisions of the Montana Administrative Procedure Act and permit intervention as in any other contested case proceeding.

(c) Upon considering the application for summary closure, the commission will either grant or deny the application. If its decision is to deny the application it shall by order establish a procedure for hearing the claims of those parties opposing the application.