; (C) to the maximum extent practicable, expand photovoltaic solar energy availability to— (i) geographical areas, throughout the United States and within States, territories, and Indian tribal land, with— (I) low photovoltaic solar penetration; or (II) a higher cost burden with respect to the deployment or installation of photovoltaic solar electricity generating facilities; (ii) rural communities; (iii) Indian tribes; and (iv) other underserved areas, including Appalachian and Alaska Native communities; (D) take into account the warranty period and quality of the applicable photovoltaic solar electricity generating facility equipment and any necessary interconnecting equipment; and (E) ensure that all calculations for estimated household energy savings are based solely on electricity offsets from the photovoltaic solar electricity generating facilities. (d) Loan and grant agreements (1) In general As a condition of receiving a loan or grant under this section, an eligible entity shall enter into a loan or grant agreement, as applicable, with the Secretary. (2) Requirements A loan or grant agreement under this subsection shall— (A) require the eligible entity— (i) to use the assistance provided under this section only in accordance with this section; (ii) to install such quantity of solar systems with such defined capacity target (expressed in megawatts) as may be established by the Secretary, taking into consideration the costs associated with carrying out loan or grant obligations in the areas in which the solar systems will be developed; (iii) to use the assistance in a manner that leverages other sources of funding (other than loans or grants under this section), including private or public funds, in developing the solar projects; and (iv) to establish loan terms, if applicable, that maximize the benefit to the low-income households, and households in disadvantaged communities, receiving solar energy from the eligible entity