25 CFR § 175.200 - Why does BIA collect revenue from you and the other customers it serves, and how is that revenue used?
(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.