By rule and after hearing, the Director of the State Department of Energy may adopt a schedule of reasonable fees that the State Department of Energy may require of applicants for a grant for a renewable energy production system under ORS § 469B.250 to 469B.265 or for tax credit certification under ORS § 315.326. Before the adoption or revision of the fees, the department shall estimate the total cost of the program to the department. The fees shall be used to recover the anticipated cost of administering and enforcing the provisions of ORS § 469B.250 to 469B.265, including filing, investigating, granting and rejecting applications for grant or tax credit certification and ensuring compliance with ORS § 315.326, 315.329 and 469B.250 to 469B.265 and shall be designed not to exceed the total cost estimated by the department. Any excess fees shall be held by the department and shall be used by the department to reduce any future fee increases. The fee may vary according to the size and complexity of the system. The fee is not considered part of the cost of the system for which a grant is being sought. [2011 c.730 § 31]