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ATTACHMENT A ATMOS ENERGY CORPORATION MID-TEX DIVISION REVISION NO: 0 RIDER: GCR - GAS COST RECOVERY APPLICABLE TO: Entire Division EFFECTIVE DATE: 10101/2008 PAGE: 40 Applicable to Rate R, Rate C, and Rate I for all gas sales made by Company, and applicable to Rate R, Rate C, Rate 1, and Rate T for recovery of Pipeline System costs. The total gas cost recovery amount due is determined by adding the gas cost calculated in Section (a) below and the pipeline cost calculated in Section (b) below. The amount due for gas cost (Section (a)) is determined by multiplying the Gas Cost Recovery Factor (GCRF) by the Customer's monthly volume. For Customers receiving service under Rate R and Rate C, monthly volume will be calculated on a Mcf basis. For Customers receiving service under Rate 1, monthly volume will be calculated on an MMBtu basis and the quantities will be adjusted as necessary to recover actual gas costs. The amount due for pipeline cost (Section (b)) is determined by multiplying the Pipeline Cost Factor (PCF) by the Customer's monthly volume. For Customers receiving service under Rate R and Rate C, monthly volume will be calculated on an Mcf basis. For Customers receiving service under Rate I and Rate T, monthly volume will be calculated on an MMBtu basis and the quantities will be adjusted as necessary to recover actual gas costs. (a) Gas Cost Method of Calculation The monthly gas cost adjustment is calculated by the application of a Gas Cost Recovery Factor (GCRF), as determined with the following formula: GCRF = Estimated Gas Cost Factor (EGCF) + Reconciliation Factor (RF) + Taxes (TXS) EGCF = Estimated cost of gas, including lost and unaccounted for gas attributed to residential, commercial, and industrial sales, and any reconciliation balance of unrecovered gas costs, divided by the estimated total residential, commercial, and industrial sales. Lost and unaccounted for gas is limited to 5%. RF = Calculated by dividing the difference between the Actual Gas Cost Incurred, inclusive of interest over the preceding iwelve-month period ended June 30 and the Actual Gas Cost Billed over that same twelve-month period by the estimated total residential, commercial, and industrial sales for the succeeding October through June billing months. The interest rate to be used is the annual interest rate published by the PUC every December. The interest rate of 2008 is 4.69%. Actual Gas Cost Incurred = The sum of the costs booked in Atmos Energy Corp., Mid-Tex Division account numbers 800 through 813 and 858 of the FERC Uniform System of Accounts, including the net impact of injecting and withdrawing gas from storage. Also includes a credit or debit for any out-of-period adjustments or unusual or nonrecurring costs typically considered gas costs and a credit for amounts received as Imbalance Fees or Curtailment Overpull Fees. Actual Gas Gost Billed = EGCF multiplied by the monthly volumes billed to Residential, Commercial and Industrial Sales customers, less the total amount of gas cost determined to have been uncollectible and written off which remain unpaid for each month of the reconciliation period. Issued By: David J. Park Vice President, Rates and Regulatory Affairs Date Issued: 08/13/2008 w 000055