Tenn. Code Ann. § 68-201-202: Local ordinances

(a) Any city, town or county having a population of six hundred thousand (600,000) or more, according to the federal census of 1960 or any subsequent federal census, is authorized to enact, by its chief legislative body, ordinances or regulations not less stringent than part 1 of this chapter. A violation of any of the ordinances or enactments of the chief legislative body is punishable as a Class A misdemeanor.

(b) Actions taken in accordance with this section shall be conducted in accordance with the Major Energy Project Act of 1981, compiled in title 13, chapter 18, when the action involves a major energy project, as defined in § 13-18-102 .