; (B) secure and maintain agreements for the utilization or sequestration of captured carbon dioxide; and (C) upon completion, demonstrate carbon capture technologies on a power system producing not less than 100 megawatts of power. (6) Cost sharing The Secretary shall require cost sharing under this subsection in accordance with section 988. (g) Definition of power system In this section, the term power system means any electricity generating unit that utilizes fossil fuels to generate electricity provided to the electric grid or directly to a consumer. (h) Authorization of appropriations For activities under this section, there are authorized to be appropriated to the Secretary— (1) $300,000,000 for fiscal year 2019; (2) $315,000,000 for fiscal year 2020; (3) $330,750,000 for fiscal year 2021; (4) $347,288,000 for fiscal year 2022; and (5) $364,652,000 for fiscal year 2023. . (b) GAO study (1) In general The Comptroller General of the United States shall conduct a study of the Department’s successes, failures, practices, and improvements in carrying out demonstration projects for carbon capture technologies for power systems. In conducting the study, the Comptroller General shall consider, at a minimum— (A) applicant and contractor qualifications; (B) project management practices at the Department; (C) economic or market changes and other factors impacting project viability; (D) completion of third-party agreements, including power purchase agreements and carbon dioxide offtake agreements; (E) regulatory challenges