resources constructed, completed, or acquired after
December 5, 1980, by a customer, an entity acting on behalf of such customer, or political subdivision served by the customer which reduce the obligation of the Administrator to acquire resources under this chapter. Such resources shall be renewable resources or multipurpose projects or other resources which are not inconsistent with the plan or, in the absence of a plan, not inconsistent with the criteria of
section 839b(e)(1) of this title and the considerations of
section 839b(e)(2) of this title.