Neb. Rev. Stat. §§ 14-2139
A metropolitan utilities district shall pay to every city or village of any class, other than metropolitan, in which such district sells water or gas, or both, at retail, a sum equivalent to two percent of the annual gross revenue derived from all retail sales of water or gas, or both, sold by such district within the city or village, except that retail sales of gas shall not include the retail sale of natural gas used as vehicular fuel. Such sums shall be paid not later than the thirtieth day of January of the next succeeding year. Such cities or villages shall not levy or collect any license, occupation, or excise tax upon or from such district. All payments provided by this section shall be allocated by the district among the several utilities operated by it upon such basis as the district shall determine.
Neb. Rev. Stat. §§ 14-2139