(a) Effective October 1, 2011, the maximum exemption period for a qualifying industrial or research enterprise described in paragraph e. of subdivision (10) of subsection (a) of Section 40-9B-3, which is owned by a utility described in Section 37-4-1(7)a., shall be 10 years applied as follows:

(1) With respect to land, the abatement shall begin with the first October 1 lien date following commencement of the project, and the abatement shall be for a total of 10 years.

(2) With respect to each portion of real property construction work in progress which was not taxable on the prior October 1 lien date, the abatement for the portion shall begin with the first October 1 lien date on which the construction work in progress becomes taxable, and the abatement shall be for a total of 10 years.

(3) With respect to each item of tangible personal property, the abatement shall begin with the first October 1 lien date on which the item of tangible personal property becomes taxable, and the abatement shall be for a total of 10 years.

(b) Effective October 1, 2011, the maximum exemption period for a qualifying industrial or research enterprise described in paragraph e. of subdivision (10) of subsection (a) of Section 40-9B-3 which is owned by an entity organized under Chapter 6 of Title 37, or by an authority both organized and existing pursuant to Chapter 50A of Title 11, and subject to the payments required to be made in lieu of ad valorem, sales, use, license, and severance taxes imposed by Section 11-50A-7, shall be 20 years applied as follows:

(1) With respect to land, the abatement shall begin with the first October 1 lien date following commencement of the project, and the abatement shall be for a total of 20 years.

(2) With respect to each portion of real property construction work in progress which was not taxable on the prior October 1 lien date, the abatement for that portion shall begin with the first October 1 lien date on which the construction work in progress becomes taxable or subject to payments required to be made in lieu of taxes, and the abatement shall be for a total of 20 years.

(3) With respect to each item of tangible personal property, the abatement shall begin with the first October 1 lien date on which the item of tangible personal property becomes taxable or subject to payments required to be made in lieu of taxes, and the abatement shall be for a total of 20 years.

(c) The abatements of ad valorem taxes and payments in lieu thereof allowed by Act 2008-275 shall become effective for projects for which statements of intent are filed after December 31, 2011, and any such abatements shall be granted for 10 years. No ad valorem taxes or payments in lieu thereof shall be abated for periods prior to January 1, 2012. The other abatements allowed by Act 2008-275 shall become effective after December 31, 2011.