2008-002-ORD-APPROVING SETTLEMENT AGREEMENT BETWEEN ATMOS CITIES STEERING COMMITTEE AND ATMOS ENERGY CORP

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EXHIBIT A TARIFF FOR GAS SERVICE ATMOS ENERGY CORP., MID -TEX DIVISION RIDER: Rider RRM — Rate Review Mechanism APPLICABLE TO: Entire Mid -Tex Division REVISION DATE: EFFECTIVE DATE: PAGE: 1 of 5 February 1, 2008 RIDER RRM — RATE REVIEW MECHANISM Purpose: This mechanism is designed to provide annual earnings transparency. If, through the implementation of the provisions of this mechanism, it is determined that rates should be decreased or increased, then rates will be adjusted accordingly in the manner set forth herein. The rate adjustments implemented under this mechanism will reflect annual changes in the Company's cost of service and rate base. This adjustment will be authorized for an Initial Implementation Period. With the conclusion of the final rate adjustment, if any, for the Initial Implementation Period, each entity having original jurisdiction may revoke, amend, or approve Subsequent Implementation Period(s) for, the mechanism. Definitions a) The Annual Evaluation Date shall be the date the Company will make its annual filing under this mechanism. The Annual Evaluation Date shall be no later than March 1, of each year. This filing shall be effective in electronic form where practicable. The initial filing shall be made March 31, 2008. b) Audited Financial Data shall mean the Company's books and records related to the Company's Mid - Tex operating area and shared services operations. Audited Financial Data shall not require the schedules and information provided under this tariff to undergo a separate financial audit by an outside auditing firm similar to the Company's annual financial audit. c) The Evaluation Period is defined as the twelve month period ending December 31, of each calendar year. The initial Evaluation Period shall be calendar year 2007. d) The Rate Effective Period is defined as the earlier of the twelve month period for which rates determined under this mechanism will be in effect or subsequent rates are implemented. e) Per Connection Basis is defined as the average number of connections during the Evaluation Period. f) Initial Implementation Period is defined as the three (3) year period commencing with the Company's filing under this mechanism for the calendar year 2007, effective October 1, 2008, and shall conclude with the implementation of rate adjustments, if any, for the third Rate Effective Period. g) Subsequent Implementation Period is defined as any three (3) year period after the conclusion of the Initial Implementation Period. h) Final Order is defined as the most recent order establishing the Company's latest effective rates for the area in which the mechanism is implemented, and shall include municipal rate ordinances and resolutions. Rate Review Mechanism The Company shall file with each regulatory authority having original jurisdiction over the Company's rates the schedules specified below for the Evaluation Period, with the filing to be made by the Annual 23