(a) There is hereby provided, to each pensioner, annuitant and retiree of any retirement plan other than the Employees' Retirement System whose retirement is based upon service to an employer participating in the Employees' Retirement System under Section 36-27-6, and whose effective date of retirement is prior to October 1, 1989, a cost-of-living increase of ten percent of his current monthly benefit; provided, however, such increase shall not be less than $20.00 nor more than $50.00 per month.

(b) There is hereby provided, to each pensioner whose retirement is based upon service to an employer participating in the Employees' Retirement System under Section 36-27-6, but who retired prior to such employer's participation in the said Employees' Retirement System and who receives a monthly allowance from the Employees' Retirement System a cost-of-living increase of ten percent of his current monthly benefit; provided, however, such increase shall not be less than $20.00 nor more than $50.00 per month.

(c) No person whose retirement is from a unit participating under Section 36-27-6, shall be entitled to the increased benefits provided in subsections (a) and (b) of this section unless such employee elects to come under the provisions of this section. Any employer making such election must bear the cost of the cost-of-living increases paid to its former employees pursuant to this section. Any employer participating under Section 36-27-6 may elect to come under the provisions of this section at the beginning of any subsequent fiscal year and such employer may not be required to pay said cost-of-living increase retroactively.

(d) The provisions of this section are supplemental. It shall be construed in pari materia with other laws regulating and providing for the payment of retirement benefits to the retired members of the Employees' Retirement System of Alabama; however, those laws or parts of laws which are in direct conflict or inconsistent therewith are hereby repealed to the extent of such conflict.