Neb. Rev. Stat. § 14-107

The city council of a city of the metropolitan class may erect, construct, purchase, maintain, and operate subways or conduits, waterworks, gas works, electric light and power plants; provide and equip aerial landing fields; determine, fix, and charge rentals for subways and conduits; and fix rates to be charged by such enterprises, except as otherwise provided by law. The city council may adopt and promulgate and enforce all needful and proper rules and regulations in connection with the operation of any such enterprises.