Tenn. Code Ann. § 7-34-118

The powers conferred by this chapter shall be in addition and supplemental to, and the limitations imposed by this chapter shall not affect, the powers conferred by any other general, special or local law. Public works may be acquired, purchased, constructed, reconstructed, improved, bettered, and extended, and bonds may be issued under this chapter for such purposes, notwithstanding that any general, special or local law may provide for the acquisition, purchase, construction, reconstruction, improvement, betterment and extension of like public works, or the issuance of bonds for like purposes, and without regard to the requirements, restrictions, limitations or other provisions contained in any other general, special or local law, including, but not limited to, any requirement for the approval by the voters of any municipality.