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TARIFF FOR GAS SERVICE <br />ATMOS ENERGY CORP., <br />M!D-TEX DIVISION <br />RIDER: <br />Rider WNA - Weather Normalization Adjustment <br />APPLICABLE T0: <br />Entire System <br />REVISION: <br />DATE: <br />EFFECTIVE DATE: <br />PAGE: 3 OF 3 <br />November 1, 2008 <br />Sample WNAF1 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 Actual 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 />