The park or community owner and the gas or electric corporation shall develop a cost for the transfer of the gas or electric system that reflects the factors in Section 2793, indemnity and liability issues, and any other factors as the parties may mutually agree upon, and to which the gas or electric corporation’s ratepayers are indifferent. The parties may agree on a schedule for phasing in facilities to meet expected load increases and betterments, and the costs associated with those activities.