The Secretary shall approve such applications submitted by a State energy agency as he determines to be in compliance with this section and with the requirements of the applicable State plan approved under section
6371c of this title. The Secretary shall state the reasons for his disapproval in the case of any application which he disapproves. Any application not approved by the Secretary may be resubmitted by the applicant at any time in the same manner as the original application and the Secretary shall approve such resubmitted application as he determines to be in compliance with this section and the requirements of the State plan. Amendments of an application shall, except as the Secretary may otherwise provide, be subject to approval in the same manner as the original application. All or any portion of an application under this section may be disapproved to the extent that funds are not available under this part to carry out such application or portion.