Certificates with a limited duration may be renewed during or at the end of the period, after opportunity for hearing held according to the criteria for the granting of an original certificate in section 504 of this title and after the Commission has made the finding required by that section. As part of the renewal proceedings, the Commission shall hold a public hearing in each county served pursuant to the certificates which are the subject of the renewal proceedings. (Added 1987, No. 271 (Adj. Sess.), § 7, eff. June 21, 1988; amended 1999, No. 157 (Adj. Sess.), § 11.)