The Secretary is authorized and empowered, from the sums hereinbefore authorized, to make loans for rural electrification to persons, corporations, States, Territories, and subdivisions and agencies thereof, municipalities, peoples’ utility districts and cooperative, nonprofit, or limited-dividend associations, organized under the laws of any State or Territory of the United States, for the purpose of financing the construction and operation of generating plants, electric transmission and distribution lines or systems for the furnishing and improving of electric service to persons in rural areas, including by assisting electric borrowers to implement demand side management, energy efficiency and conservation programs, and on-grid and off-grid renewable energy systems, and loans, from funds available under section 903 of this title, to cooperative associations and municipalities for the purpose of enabling said cooperative associations, and municipalities to the extent that such indebtedness was incurred with respect to electric transmission and distribution lines or systems or portions thereof serving persons in rural areas, to discharge or refinance long-term debts owed by them to the Tennessee Valley Authority on account of loans made or credit extended under the terms of the Tennessee Valley Authority Act of 1933, as amended [16 U.S.C. 831 et seq.]: Provided, That the Secretary, in making such loans, shall give preference to States, Territories, and subdivisions and agencies thereof, municipalities, peoples’ utility districts, and cooperative, nonprofit, or limited-dividend associations, the projects of which comply with the requirements of this chapter.