Tennessee Code Title 6. Cities and Towns § 6-33-107

(1) The planning, development, construction, acquisition, or operation of any public improvement, utility, or facility;

(2) A common public service;

(3) Having the same individuals serve as officers or employees in more than one (1) political subdivision or federal or state agency, or any of these subdivisions or agencies, on a part-time basis in each;

(4) The construction or operation of federally-owned utilities and other property on behalf of the federal government;

(5) The acquisition by gift or by transfer or by purchase of federal property and if by purchase for the financing of its acquisition;

(6) Entering into contracts relating to acceptance of payments in lieu of taxes or state, federal, or other contributions; and

(7) The furnishing of services to the federal government and its designees, outside the city limits as well as within.