; (xi) operational flexibility to respond to changes in demand for electricity and to complement integration with intermittent renewable energy; or (xii) improved resilience; and (B) a fusion reactor. ; and (2) by adding at the end the following: (7) Institution of higher education The term institution of higher education has the meaning given the term in section 101(a) of the Higher Education Act of 1965 ( 20 U.S.C. 1001(a) ). . 3. Nuclear energy research, development, demonstration, and commercial application programs (a) Reactor concepts research, development, and demonstration Section 952 of the Energy Policy Act of 2005 ( 42 U.S.C. 16272 ) is amended to read as follows: 952. Reactor concepts research, development, demonstration, and commercial application (a) Sustainability program for light water reactors (1) In general The Secretary shall carry out a program of research, development, demonstration, and commercial application to support existing operating nuclear power plants which shall address technologies to modernize and improve, with respect to such plants— (A) reliability; (B) capacity; (C) component aging; (D) safety; (E) physical security and security costs; (F) plant lifetime; (G) operations and maintenance costs, including by utilizing risk-informed systems analysis; (H) the ability for plants to operate flexibly; (I) nuclear hybrid energy system applications described in subsection (c); (J) efficiency; (K) environmental impacts; and (L) resilience. (2) Authorization of appropriations There are authorized to be appropriated to the Secretary to carry out the program under this subsection— (A) $55,000,000 for fiscal year 2021; (B) $57,750,000 for fiscal year 2022; (C) $60,637,500 for fiscal year 2023; (D) $63,669,375 for fiscal year 2024