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EXHIB{T A <br />TARIFF FOR GAS SERVICE ATMOS ENERGY CORP., <br />MID-TEX DIVISION <br />RIDER: <br />Rider WNA - Weather Normalization Adjustment <br />APPLICABLE TO: <br />Entire System <br />REVISION: <br />DATE: <br />EFFECTIVE DATE: <br />PAGE: 3 OF 3 <br />November 1, 2008 <br />Sample WNAFl Calculation: <br />(.0131 x (30-17) ) <br />1533 per Mcf = 1.2267 x <br />(1.14 + (.0131 x 17) ) <br />Where <br />i = Residential Single Block Rate Schedule <br />Ri = 1.2267 per MCF (Rate R- Final Order GUD No. 9670) <br />HSFi = .0131 (Residential - Abilene Area) <br />NDD = 30 HDD (Simple ten-year average of Actua) HDD for Abilene Area - 9/15/06 <br />-10/14/06) <br />ADD = 17 HDD (Actual HDD for Abilene Area - 9/15/06 -10/14/06) <br />Bli = 1.14 Mcf (Residential - Abilene Area) <br />22 <br />. . . . ._._.._...._.T.... . . <br />