(a) Under regulations adopted by the commission, every intrastate oil or gas pipeline carrier shall file with the commission, within the time and in the form designated by the commission, all rates, tariffs, charges, classifications, rules, regulations, terms, and conditions pertaining to service provided under the certificate, and shall maintain copies on file at its principal business office and at places designated by the commission, available to, and subject to inspection by, the general public on demand.
(b) The commission may reject the filing of all or part of a tariff that does not comply with the form or filing regulations of the commission or that is not consistent with this chapter or the regulations of the commission. A tariff or provision rejected by the commission is void.
(c) In its tariff filed with the commission under (a) of this section, a natural gas pipeline carrier may charge separate rates for firm transportation service and for interruptible transportation service. A natural gas pipeline carrier
(1) may, in addition, impose a reservation fee or similar charge for reservation of capacity in a natural gas pipeline as a condition of providing firm transportation service; the reservation fee or charge imposed by the carrier may not include any variable costs or fixed costs that are not attributable to the provision of firm transportation service;
(2) may not impose a reservation fee or similar charge for reservation of capacity in a natural gas pipeline for interruptible transportation service.