After the date of its inclusion in a district created wholly or in part to furnish electric light and power, the real property is subject to all of the taxes and charges imposed by the district and is liable for its proportionate share of existing general obligation bonded indebtedness of the district. The property is not liable for any taxes or charges levied or assessed before its inclusion in the district. Entry of the property into the district may not be subject to or contingent upon the payment or assumption of any penalty, toll or charge, other than any reasonable annexation charge which the board may fix and uniformly assess and the tolls and charges which are uniformly made, assessed or levied for the entire district. Any charge imposed must be computed in a manner that does not impose a new charge on the members of the district and must not penalize the members of the territory to be annexed.