Upon the face or back of each periodic and terminal billing for retail consumption of electric, gas, and water services, there shall appear a conspicuous notation of charges for fuel adjustment and a notation of the meter reading upon which the billing was computed, including the previous reading and consumption. Where a customer is on a voluntary "budget bill" or "levelized bill" agreement, the actual consumption for any period of time may be omitted until the annual anniversary account billing. The rates on which the bill was computed shall be made readily available to the customer upon demand; and a notation of where the rates can be obtained shall appear on the face of the bill.