25 CFR § 175.235
How does BIA include changes in purchased power costs in electric power rates?
February 24, 2021
When our cost of purchased power changes:
(a) We determine the effect of the change;
(b) We adjust the purchased power component of your bill accordingly;
(c) We add the purchased power adjustment to the existing electric power rate and put it into effect immediately;
(d) The purchased power adjustment remains in effect until we determine future adjustments are necessary;
(e) We must publish in the local newspaper and post at our office a notice of the purchase power adjustment and the basis for the adjustment; and
(f) Our decision to make a purchased power adjustment must be final.