During the construction period of a qualifying power generation facility, the exemption provided in § 10-35-1.5 shall be as follows:
(1) For the first legal assessment date after the construction date of the power generation facility, as provided in § 10-35-9, upon all value in excess of ten percent of the amount provided in § 10-35-1.5;
(2) For the second legal assessment date after the construction date of the power generation facility, as provided in § 10-35-9, upon all value in excess of twenty percent of the amount provided in § 10-35-1.5; and
(3) For the third and subsequent legal assessment dates after the construction date of the power generation facility, as provided in § 10-35-9, upon all value in excess of thirty percent of the amount provided in § 10-35-1.5.