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ATTACHMENT A TARfFF FOR GAS SERVICE ATMOS ENERGY CORP., MID-TEX DIVISION RIDER: Rider WNA - Weather Normalization Adjustment APPLICABLE TO: Entire System (except Environs areas and the City of Dallas) REVISION: DATE: EFFECTIVE DATE: 11/01/2008 PAGE: 1 OF 2 RIDER WNA - Weather Normalization Adiustment Provisions for Adjustment The base rate per Mcf (1,000,000 Btu) for gas service set forth in any Rate Schedules utilized by the cities of the Mid-Tex Division service area for determining normalized winter period revenues shall be adjusted by an amount hereinafter described, which amount is referred to as the "Weather Normalization Adjustment." The Weather Normalization Adjustment shall apply to all temperature sensitive residential, and commercial bills based on meters read during the revenue months of November through April. The five regional weather stations are Abilene, Austin, Dallas, Waco, and Wichita Falls. Computation of Weather Normalization Adjustment The Weather Normalization Adjustment Factor shall be computed to the nearest one-hundredth cent per Mcf by the following formula: (HSFi x (NDD-ADD) ) WNAFi = Ri (BLi + (HSFi x ADD) ) Where = any particular Rate Schedule or billing classification within any such particular Rate Schedule that contains more than one billing classification WNAFi = Weather Normalization Adjustment Factor for the ith rate schedule or classification expressed in cents per Mcf Ri = base rate of temperature sensitive sales for the ith schedule or classification approved by the entity exercising original jurisdiction. H5Fi = heat sensitive factor for the ith schedule or classification calculated as the slope of the linear regression of average sales per bill (Mco and actual heating degree days by month for the test year by schedule or classification and weather station as part of the RRM filing. NDD = billing cycle normal heating degree days caiculated as the simple ten-year average of actual heating degree days. ADD = billing cycle actual heating degree days. Bli = base load sales for the ith schedule or classification calculated as the y- intercept of the linear regression of average sales per bill (Mcfl and actual heating degree days by month for the test year by schedule or classification and weather station as part of the RRM filing. The Weather Normalization Adjustment for the jth customer in ith rate schedule is computed as: WNA; = WNAF; x q;j - 000061