; (B) geothermal resources, including a geothermal heat pump; or (C) any other source the Secretary determines appropriate for purposes of this section. (5) Secondary school The term secondary school has the meaning given such term in section 8101 of the Elementary and Secondary Education Act of 1965 ( 20 U.S.C. 7801 ). (6) Secretary The term Secretary means the Secretary of Energy. (g) Authorization of appropriations There are authorized to be appropriated to the Secretary $10,000,000 for each of fiscal years 2019 through 2023 for purposes of carrying out this section.