Contract for use of facilities; increase in charges; duration of contract.

Sec. 20. Any 1 or more municipalities or other public corporations, either within or without an authority, may contract for the use of facilities from an authority operating under this act. The charges specified in a contract are subject to increase by the authority at any time in order to provide funds to meet the obligations of the project involved. A contract authorized under this section must be for a period of not more than 50 years.