A contract for the construction of a public building or for the major renovation of a public building shall require the use of clean renewable energy technology. The building shall have installed a minimum of one kilowatt of clean renewable energy technology for every one thousand (1,000) square feet of gross floor area subject to Subsection (b) below. Ground mounted clean renewable energy technology on or directly adjacent to the building lot may be used to meet this requirement. The Purchasing Agent shall limit the size of the clean renewable energy technology installation if the upfront cost of the installation is projected to exceed two percent (2%) of the projected total cost of the new building or renovation unless the expenditures have been transferred to the project under Section 10A-158.05(b), in which case the expenditures upfront cost shall be limited to four percent (4%) of the projected total cost.