Except as otherwise provided in this section, each electric utility that owns all or part of an asset which has been classified as surplus by an electric utility pursuant to NRS 704.7338 or reclassified as surplus by the Commission pursuant to NRS 704.7339 shall carry out the surplus asset retirement plan filed pursuant to NRS 704.734. The Commission may, for good cause, extend the projected final sale date or otherwise amend the surplus asset retirement plan.