The authority shall not operate or construct any project for profit except insofar as any such profit will inure to the benefit of the public. It shall fix rates, fees, tolls and other charges consistent with this declaration of policy such as will produce revenues only in amounts sufficient, together with all other revenues of the authority, to pay all costs and meet all obligations and other requirements described in this subsection.
Ala. Code § 11-50A-18 (1975)