Ala. Code § 11-44B-19
All laws relating to the school board, library board, hospital board, industrial development boards or authorities, housing authorities, medical clinic boards, plumbers or electricians boards or other technical boards, planning board, zoning board, park or recreation board, municipally owned public utility, other boards and agencies and any municipally owned service enterprise, including inter-alia, electric, gas and water boards, agencies, etc., and any board, authority, agency, etc., given such independent status as the same may apply and be in effect at the time when the municipality shall elect to be governed by the provisions of this article, shall continue in full force and effect and without interruption or change as to the establishment of conduct of any such authority, board, or agency until otherwise provided by law.
Ala. Code § 11-44B-19 (1975)