Tenn. Code Ann. § 42-3-118: Supplementary authority

(a) The powers conferred by this chapter are in addition to the powers conferred by any other law, and are not in substitution for such powers, and the limitations imposed by this chapter shall not affect powers conferred by any other law.

(b) The powers granted by this chapter may be exercised without regard to requirements, restrictions, or procedural provisions contained in any other law or chapter, except as expressly provided in this chapter.

(c) In addition to the general and special powers conferred by this chapter, every authority is authorized to exercise such powers as are necessarily incidental to the exercise of such general and special powers.