; and (ii) to make distributed renewable generation facilities cost competitive with other sources of renewable electricity generation. (C) Facilities placed in service after enactment (i) In general For any renewable generation facility placed in service after the date of enactment of this section, subparagraph (B) shall not apply for the first 10 years after the date on which the facility is placed in service. (ii) Initial period For each year during the 10-year period described in clause (i), the Commission shall issue to the facility the same number of Federal renewable electricity credits per megawatt hour as are issued to that facility in the year in which the facility is placed in service. (iii) Subsequent period After the 10-year period described in clause (i), the Commission shall issue Federal renewable electricity credits to the facility in accordance with subparagraph (B). (5) Credits based on qualified hydropower For purposes of this subsection, the number of Federal renewable electricity credits issued for qualified hydropower shall be calculated— (A) based solely on the increase in average annual generation directly resulting from the efficiency improvements or capacity additions described in subsection (b)(6)(A); and (B) using the same water flow information used to determine a historic average annual generation baseline for the hydroelectric facility, as certified by the Commission. (6) Generation from mixed renewable and nonrenewable resources If electricity is generated using both a renewable energy resource and an energy source that is not a renewable energy resource (such as cofiring of renewable biomass and fossil fuel), the Commission shall issue Federal renewable electricity credits based on the proportion of the electricity that is attributable to the renewable energy resource. (7) Prohibition against double-counting The Commission shall ensure that— (A) no Federal renewable electricity credit is used more than once for compliance with this section