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 1 OF 6 I. Applicability Applicable to Residential, Commercial, Industrial, and Transportation tariff customers in the Mid-Tex Division of Atmos Energy Corporation ("Company") except such customers within the City of Dallas. This Rate Review Mechanism ("RRM") provides for an annual adjustment to the Company's Rate Schedules R, C, I and T("Applicable Rate Schedufes"). Rate calculations and adjustments required by this tariff shall be determined on a System-Wide cost basis. II. Definitions "Test Period" is defined as the twelve months ending December 31 of each preceding calendar year. The "Effective Date" is the date that adjustments required by this tariff are applied to customer bills. The annual Effective Date is June 1. The 2013 filing Effective Date is October 15, 2013. Unless otherwise noted in this tariff, the term "Final Order" refers the final order issued by the Railroad Commission of Texas in GUD 10170. The term "System-Wide" means all incorporated and unincorporated areas served by the Company. "Review Period" is defined as the period from the Filing Date until the Effective Date. The "Filing Date" is as early as practicable but no later than March 1 of each year with the exception of 2013, which shall have a Filing Date of July 15, 2013. The last annua� Effective Date is June 1, 2017. III. Calculation The RRM shall calculate an annual, System-Wide cost of service ("COS") that will be used to adjust applicable rate schedules prospectively as of the Effective Date. The annual cost of service will be calculated according to the following formula: COS=OM+DEP+RI+TAX+CD-ADJ 1�i�1 iL�� OM = all reasonable and necessary operation and maintenance expenses from the � .�.