Any city of the second class or village is hereby authorized and empowered to enter into a contract for the furnishing of electricity, power, steam or other product of any system or plant, owned and operated by such city or village, to any person or corporation, if the furnishing of such electricity, power, steam or other product shall not interfere with the proper purposes for which the lighting, heating, waterworks or other plant of such city or village was intended.
Neb. Rev. Stat. §§ 17-901