15-ATMOS GAS RATE REVIEW MECHANISM (RRM) TARIFF

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ATMOS ENERGY CORPORATION MID-TEX DIVISION Attachment "A" RATE SCHEDULE: RRM - Rate Review Mechanism APPLICABLE TO: ALL AREAS IN THE MID-TEX DIVISION EXCEPT THE CITY OF DALLAS CUSTOMERS EFFECTIVE DATE: Bills Rendered on and after October 15, 2013 PAGE 2 OF 6 Test Period adjusted for known and measurable items and prepared consistent with the rate making treatments approved in the Final Order. Known and measurable adjustments shall be limited to those changes that have occurred prior to the Filing Date. OM may be adjusted for atypical and non-recurring items. Shared Services allocation factors shall be recalculated each year based on the latest component factors used during the Test Period, but the methodology used will be that approved in the Final Order. DEP = depreciation expense calculated at depreciation rates approved by the Final Order. RI = return on investment calculated as the Company's pretax return multiplied by rate base at Test Period end. Rate base is prepared consistent with the rate making treatments approved in the Final Order, except that no post Test Period adjustments will be permitted. Pretax return is the Company's weighted average cost of capital before income taxes. The Company's weighted average cost of capital is calculated using the methodology from the Final Order including the Company's actual capital structure and long term cost of debt as of the Test Period end (adjusted for any known and measurable changes) and the return on equity from the Final Order. However, in no event will the percentage of equity exceed 55%. Regulatory adjustments due to prior regulatory rate base adjustment disallowances will be maintained. Cash working capital will be calculated using the lead/lag days approved in the Final Order. With respect to pension and other postemployment benefits, the Company will record a regulatory asset or liability for these costs until the amounts are included in the next annual rate adjustment implemented under this tariff. Each year, the Company's filing under this Rider RRM will clearly state the level of pension and other postemployment benefits recovered in rates. TAX = income tax and taxes other than income tax from the Test Period adjusted for known and measurable changes occurring after the Test Period and before the Filing Date, and prepared consistent with the rate making treatments approved in the Final Order. CD = interest on customer deposits. ADJ = Downward adjustment to the overall, System-Wide test year cost of service in the amount of $3,000,000.00, adjusted by a percentage equal to the total percentage increase in base-rate revenue sought pursuant to this tariff. 65