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EXHIBIT A <br />MID-TEX DIVISION <br />ATMOS ENERGY CORPORATION <br />RIDER: WNA — WEATHER NORMALIZATION ADJUSTMENT <br />APPLICABLE TO: ALL CUSTOMERS IN THE MID-TEX DIVISION UNDER THE RRM TARIFF <br />EFFECTIVE DATE: BillsIs Rendered on or aft n. er 11101 <br />w.. PAGE <br />� 12018 1 <br />Provisions for Adjustment <br />The Commodity Charge per Ccf (100 cubic feet) for gas service set forth in any Rate Schedules utilized <br />by the cities of the Mid -Tex Division service area for determining normalized winter period revenues shall <br />be adjusted by an amount hereinafter described, which amount is referred to as the 'Weather <br />Normalization Adjustment." The Weather Normalization Adjustment shall apply to all temperature <br />sensitive residential and commercial bills based on meters read during the revenue months of November <br />through April. The five regional weather stations are Abilene, Austin, Dallas, Waco, and Wichita Falls. <br />Com utation of Weather Normalization Ad'ustment <br />The Weather Normalization Adjustment Factor shall be computed to the nearest one-hundredth cent <br />per Ccf by the following formula: <br />(HSFi x (NDD-ADD) ) <br />WNAFi = Ri <br />(BLi + (HSFi x ADD) ) <br />Where <br />i = any particular Rate Schedule or billing classification within any such <br />particular Rate Schedule that contains more than one billing classification <br />WNAFi = Weather Normalization Adjustment Factor for the ith rate schedule or <br />classification expressed in cents per Ccf <br />Ri = Commodity Charge rate of temperature sensitive sales for the ith schedule or <br />classification. <br />HSFi = heat sensitive factor for the ith schedule or classification divided by the <br />average bill count in that class <br />NDD = billing cycle normal heating degree days calculated as the simple ten-year <br />average of actual heating degree days. <br />ADD = billing cycle actual heating degree days. <br />Bli = base load sales for the ith schedule or classification divided by the average <br />bill count in that class <br />The Weather Normalization Adjustment for the jth customer in ith rate schedule is computed as: <br />WNA; = WNAFi x qij <br />Where q;j is the relevant sales quantity for the jth customer in ith rate schedule. <br />