403.519  Exclusive forum for determination of need.--On request by an applicant or on its own motion, the commission shall begin a proceeding to determine the need for an electrical power plant subject to the Florida Electrical Power Plant Siting Act. The commission shall publish a notice of the proceeding in a newspaper of general circulation in each county in which the proposed electrical power plant will be located. The notice shall be at least one-quarter of a page and published at least 45 days prior to the scheduled date for the proceeding. The commission shall be the sole forum for the determination of this matter, which accordingly shall not be raised in any other forum or in the review of proceedings in such other forum. In making its determination, the commission shall take into account the need for electric system reliability and integrity, the need for adequate electricity at a reasonable cost, and whether the proposed plant is the most cost-effective alternative available. The commission shall also expressly consider the conservation measures taken by or reasonably available to the applicant or its members which might mitigate the need for the proposed plant and other matters within its jurisdiction which it deems relevant. The commission's determination of need for an electrical power plant shall create a presumption of public need and necessity and shall serve as the commission's report required by s. 403.507(2)(a)2. An order entered pursuant to this section constitutes final agency action.