; and (iv) to establish loan terms, if applicable, that maximize the benefit to the low-income households receiving solar energy from the eligible entity; (B) require the Secretary to rescind any amounts provided to the eligible entity that are not used during the 2-year period beginning on the date on which the amounts are initially distributed to the eligible entity, except in any case in which the eligible entity has demonstrated to the satisfaction of the Secretary that a longer period, not to exceed 3 years after the date of initial distribution, is necessary to deliver proposed services; (C) for a loan provided under this section, establish— (i) an interest rate equal to the then-current cost of funds to the Department of the Treasury for obligations of comparable maturity to the loan; and (ii) a payout time that maximizes the savings to customers during the effective period of the agreement; and (D) contain such other terms as the Secretary may require to ensure compliance with the requirements of this section. (e) Use An eligible entity shall use a loan or grant provided under this section only for the following activities, for the purpose of developing new photovoltaic solar projects in the United States for low-income households and individuals who otherwise would likely be unable to afford or purchase photovoltaic solar systems: (1) Photovoltaic solar equipment and installation To pay the costs of— (A) solar equipment, including only photovoltaic solar equipment and storage and all hardware or software components relating to safely producing, monitoring, and connecting the system to the electric grid or onsite storage; and (B) installation, including all direct labor associated with installing the photovoltaic solar equipment. (2) Job training To fund onsite job training and community or volunteer engagement, including— (A) only job training costs directly associated with the solar projects funded under this section