8. Cost adjustments. If the cost adjustments specified in subsection 7 exceed the cost relied upon by the commission in the original proceeding under this section by more than 20% of the original cost, the utility may not proceed with any construction of the proposed facilities, the commission's original certificate of public convenience and necessity notwithstanding. The commission, upon notification of the cost increase, shall:

A. Reopen its original decision concerning the facilities;

B. Make specific findings with regard to the need for the facilities to the same extent and with the same authority as if the company's petition for approval were before it; and

C. Except as modified in this section, retain all authority granted to it under section 1321.

9. Filing fee; waiver of fee. When a petition is filed under this section, the electric utility or utilities involved shall pay to the commission an amount equal to 2/100 of 1% of the estimated cost to erect, rebuild or relocate the facility provided that in the case of a petition filed under subsection 2, the fee shall be 4/100 of 1%. The utility may, at the time of the filing of notice of its intent to file the petition, or, in the case of lines subject to subsection 2, at the time of the filing of the petition, request the commission to waive all or a portion of the filing fee. The commission shall rule on the request for waiver within 30 days.

Filing fees paid as required under this subsection shall must be segregated, apportioned and expended by the commission for the purposes of this section. Any portion of the filing fee that is received from any utility and is not expended by the commission to process the petition for a certificate of public convenience and necessity shall must be returned to the utility.

10. Exemption from filing fees. Notwithstanding any other requirement in this section, the commission may, by rule, exempt from filing fees applications concerning transmission lines not associated with a major new generating facility or construction of small generating facilities, the review of which does not place an unusual burden on the commission's budget.