North carolina constitution
Article V
Section 10

In addition to other powers conferred upon them by law, municipalities owning or operating facilities for the generation, transmission or distribution of electric power and energy and joint agencies formed by such municipalities for the purpose of owning or operating facilities for the generation and transmission of electric power and energy (each, respectively, "a unit of municipal government") may jointly or severally own, operate and maintain works, plants and facilities, within or without the State, for the generation and transmission of electric power and energy, or both, with any person, firm, association or corporation, public or private, engaged in the generation, transmission or distribution of electric power and energy for resale (each, respectively, "a co-owner") within this State or any state contiguous to this State, and may enter into and carry out agreements with respect to such jointly owned facilities. For the purpose of financing its share of the cost of any such jointly owned electric generation or transmission facilities, a unit of municipal government may issue its revenue bonds in the manner prescribed by the General Assembly, payable as to both principal and interest solely from and secured by a lien and charge on all or any part of the revenue derived, or to be derived, by such unit of municipal government from the ownership and operation of its electric facilities; provided, however, that no unit of municipal government shall be liable, either jointly or severally, for any acts, omissions or obligations of any co-owner, nor shall any money or property of any unit of municipal government be credited or otherwise applied to the account of any co-owner or be charged with any debt, lien or mortgage as a result of any debt or obligation of any co-owner.