; and (iv) any dwelling unit that— (I) was a low-income housing dwelling unit described in section 302(b)(1) of the Native American Housing Assistance and Self-Determination Act of 1996 ( 25 U.S.C. 4152(b)(1) ); and (II) is rented only to households with an income that is not more than 80 percent of the area median income. (5) Public housing agency The term public housing agency has the meaning given the term in section 3(b) of the United States Housing Act of 1937 ( 42 U.S.C. 1437a(b) ). (6) Renewable energy The term renewable energy means— (A) utility-, community-, and small-scale photovoltaic and thermal solar energy; (B) utility- and small-scale wind energy; (C) geothermal energy; (D) microturbine hydroelectricity; (E) energy efficiency; (F) building electrification; (G) energy storage; (H) microgrids; and (I) modern distribution grid infrastructure. (7) Secretary The term Secretary means the Secretary of Housing and Urban Development. (8) Subsidized housing resident-owned business The term subsidized housing resident-owned business means a business concern that— (A) provides economic opportunities, as defined in section 3(e) of the Housing and Urban Development Act of 1968 ( 12 U.S.C. 1701u(e) ); and (B) is owned by subsidized housing residents. (9) Zero-carbon home The term zero-carbon home means a highly energy-efficient home that produces on-site, or procures, enough carbon-free renewable energy to meet the total annual energy consumption of the home. 4. Congressional findings and sense of Congress for improved architectural design in government housing programs Section 4 of the Housing and Urban Development Act of 1968 ( 12 U.S.C. 1701v ) is amended to read as follows: 4. Improved architectural design in government housing programs (a) Findings Congress finds that— (1) if Federal aid is to make its full community-wide contribution toward improving our urban and rural environments, Federal aid must have a greater impact on improvements in architectural design