(a) If the daily demand for sour gas from gas wells for use in carbon black manufacture is less than the daily maximum allowable permitted in Section 87.052 of this code, the total daily volume of gas from gas wells from the sour gas area for use in carbon black manufacture shall be equal to the daily demand.
(b) The commission shall determine the daily demand and prorate it among all the sour gas wells in the area as provided in Section 87.052 of this code.