(a) The revenue we collect from you and the other customers is authorized by 25 U.S.C. § 385c (60 Stat. 895, as amended by 65 Stat. 254).

(b) The revenue we collect may be used to:

(1) Pay for operation and maintenance of the utility;

(2) Maintain Reserve Funds to:

(i) Make repairs and replacements to the utility;

(ii) Defray emergency expenses;

(iii) Ensure the continuous operation of the power system; and

(iv) Pay other allowable expenses and obligations to the extent required or permitted by law.