construction, acquisition, and replacement of (i) the transmission system, including facilities and structures appurtenant thereto, and (ii) additions, improvements, and betterments thereto (hereinafter in this chapter referred to as “transmission system”);

operation, maintenance, repair, and relocation, to the extent such relocation is not provided for under subsection (1) above, of the transmission system;

electrical research, development, experimentation, test, and investigation related to construction, operation, and maintenance of transmission systems and facilities;

marketing of electric power;

transmission over facilities of others and rental, lease, or lease-purchase of facilities;

purchase of electric power (including the entitlement of electric plant capability) (i) on a short-term basis to meet temporary deficiencies in electric power which the Administrator is obligated by contract to supply, or 1 (ii) if such purchase has been heretofore authorized or is made with funds expressly appropriated for such purchase by the Congress, (iii) if to be paid for with funds provided by other entities for such purpose under a trust or agency arrangement, or (iv) on a short term basis to meet the Administrator’s obligations under section 4(h) of the Pacific Northwest Electric Power Planning and Conservation Act [16 U.S.C. 839b(h)];

defraying emergency expenses or insuring continuous operation;

paying the interest on, premiums, discounts, and expenses, if any, in connection with the issuance of, and principal of all bonds issued under section 838k(a) of this title, including provision for and maintenance of reserve and other funds established in connection therewith;

making such payments to the credit of the reclamation fund or other funds as are required by or pursuant to law to be made into such funds in connection with reclamation projects in the Pacific Northwest: Provided, That this clause shall not be construed as permitting the use of revenues for repayment of costs allocated to irrigation at any project except as otherwise expressly authorized by law;

making payments to the credit of miscellaneous receipts of the Treasury for all unpaid costs required by or pursuant to law to be charged to and returned to the general fund of the Treasury for the repayment of the Federal investment in the Federal Columbia River Power System from electric power marketed by the Administrator;

acquiring such goods and services, and paying dues and membership fees in such professional, utility, industry, and other societies, associations, and institutes, together with expenses related to such memberships, including but not limited to the acquisitions and payments set forth in the general provisions of the annual appropriations Act for the Department of Energy, as the Administrator determines to be necessary or appropriate in carrying out the purposes of this chapter; and

making such payments, as shall be required to carry out the purposes and provisions of the Pacific Northwest Electric Power Planning and Conservation Act [16 U.S.C. 839 et seq.].