Tenn. Code Ann. § 7-53-104: Corporations acting jointly

(a) The authorities and powers conferred in this chapter upon corporations created under this chapter may be exercised by two (2) or more such corporations acting jointly.

(b) Two (2) or more municipalities may, by acting jointly, incorporate a public corporation to effectuate the purposes of this chapter. When two (2) or more municipalities incorporate such a public corporation, each and every requisite pertaining to the application for incorporation, qualifications of applicants, certificate of incorporation, amendment of certificate and the manner of pledging municipal credit through the submission by referendum election shall be incumbent in like manner upon each municipality joining in the creation of this public corporation. An officer of a municipality or the city manager or other comparable chief administrative officer of a municipality, but not any other employee, may serve as a director of a corporation that is jointly incorporated by two (2) or more municipalities. Notwithstanding § 7-53-301 , the term of office of any director of the corporation who is an officer or employee of a municipality may be coextensive with the period of time that the director serves as an officer or employee of the municipality.