Any new electric generating facility, the construction of which is completed after July 1, 2002, may be treated for purposes of section 32-71 as if it were located in an enterprise zone and used for commercial or retail purposes, provided an application for a permanent electric generating facility has been submitted to the Connecticut Siting Council on or after January 1, 2002, and prior to April 1, 2002. Notwithstanding the provisions of section 32-71, upon approval of such municipality’s legislative body, either before or after August 15, 2002, up to the full amount of either assessments or taxes may be fixed for the real and personal property of such electric generating facility both during and after the construction period, provided such assessments or taxes as so fixed represent an approximation of the commensurate portion of the projected tax liability of such facility based on a reasonable estimation of its fair market value as determined by the municipality upon the exercise of its best efforts.