How does BIA include changes in purchased power costs in electric power rates?

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.