; (2) to promote innovation and new models of retrofitting low-income homes through new Federal partnerships with covered organizations that leverage substantial donations, donated materials, volunteer labor, homeowner labor equity, and other private sector resources; (3) to assist the covered organizations in demonstrating, evaluating, improving, and replicating widely the model low-income energy retrofit programs of the covered organizations; and (4) to ensure that the covered organizations make the energy retrofit programs of the covered organizations self-sustaining by the time grant funds have been expended. (b) Definitions In this section: (1) Covered organization The term covered organization means an organization that— (A) is described in section 501(c)(3) of the Internal Revenue Code of 1986 and exempt from taxation under 501(a) of that Code