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Transporter will refund or carry forward , for each calendar year , any difference between the revenues received by Transporter and the costs incurred by Transporter as a result of cashing-out Shipper imbalances . Transporter 's accepted bid for release of firm capacity or the posting specified in Section 20.3 ( a ) will constitute an exhibit to the Service Agreement between Transporter and the Replacement Shipper or Prearranged Replacement Shipper . Such sales shall be made under rates , terms and conditions mutually agreed upon between Transporter and purchasers , provided , however , that all such sales shall be fully interruptible and shall be curtailable pro rata without regard to underlying transportation arrangements made by purchasers . In addition , Releasing Shipper may terminate the release of capacity to a Replacement Shipper or Prearranged Replacement Shipper if such Shipper fails to pay all of the amount of any bill for service under the executed capacity release Service Agreement upon at least one week of notice to Transporter and such Shipper .