Any public agency participating in an agreement authorizing the joint exercise of governmental powers pursuant to this chapter may exercise its power of eminent domain to acquire interests in property, under provisions of law then in effect and applicable to the public agency, for the use of the entity created to carry out the agreement, provided that the power of eminent domain is not used to acquire interests in property which is part of a system of facilities in existence, under construction, or planned, for the generation, transmission or sale of electric power, or for the transmission, transportation, or sale of natural gas. In the exercise of the power of eminent domain, the public agency shall proceed in the manner provided by chapter 6B. Any interests in property acquired are acquired for a public purpose, as defined in chapter 6A, of the condemning public agency, and the payment of the costs of the acquisition may be made pursuant to the agreement or to any separate agreement between the public agency and the entity or the other public agencies participating in the entity or any of them. Upon payment of costs, any property acquired is the property of the entity.