11 Atmos Energy Corporation P.O. Box 223705 Dallas, TX 75222-3705 P 214-206-2568 l F 214-206-2126 [email protected]May 27, 2020 Kari French, Director Oversight and Safety Division Railroad Commission of Texas P. O. Box 12967 Austin, Texas 78711-2967 Re: Docket Compliance Filing GUD 10170 – WNA Report Dear Ms. French: Atmos Energy Corp, Mid-Tex Division (“Atmos” or “the Company”) hereby presents the Company’s 2019-2020 Weather Normalization (“WNA”) Report. Pursuant to Atmos Energy’s Weather Normalization Tariff (Rider WNA), this report demonstrates how the company calculated its’ WNA factors during the 2019-2020 heating season. Sincerely, Chris Felan Enclosure: WNA Report Cc: Mark Everts Chris Felan Vice President Rates & Regulatory Affairs
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11
Atmos Energy Corporation P.O. Box 223705 Dallas, TX 75222-3705 P 214-206-2568 l F 214-206-2126 [email protected]
May 27, 2020 Kari French, Director Oversight and Safety Division Railroad Commission of Texas P. O. Box 12967 Austin, Texas 78711-2967 Re: Docket Compliance Filing GUD 10170 – WNA Report Dear Ms. French: Atmos Energy Corp, Mid-Tex Division (“Atmos” or “the Company”) hereby presents the Company’s 2019-2020 Weather Normalization (“WNA”) Report. Pursuant to Atmos Energy’s Weather Normalization Tariff (Rider WNA), this report demonstrates how the company calculated its’ WNA factors during the 2019-2020 heating season. Sincerely,
Chris Felan Enclosure: WNA Report Cc: Mark Everts
Chris Felan Vice President Rates & Regulatory Affairs
Weather Normalization Adjustment Report
2020
Atmos Energy Corp. — Mid-Tex Division
June 1, 2020
Atmos Energy (Mid-Tex) WNA Report 2020
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Table of Contents
I. Introduction ........................................................................................................................................ 3
II. Computation of Weather Normalization Adjustment Factor ..................................................... 4
III. Monthly WNA Factors ...................................................................................................................... 5
All Incorporated Cities under the RRM Tariff……………………………………………………………………….5
All Incorporated Cities within the ATM-Coalition……………………………………………………………….8
City of Dallas…………………………………………………………………………………………………………………………..11
Appendix A - Weather Stations by City ............................................................................................... 14
Appendix B – WNA Tariff All Incorporated Cities under the RRM Tariff (11/01/2019) ............. 21
Appendix C – WNA Tariff Customers within City of Dallas (6/01/19) ......................................... 24
Appendix D – WNA Tariff Unincorporated Areas (12/11/2018) .................................................... 27
Appendix E – WNA Tariff All Incorporated Cities within the ATM Coalition (06/01/2019) ..... 30
Appendix F – Base Rate of Temperature Sensitive Sales ................................................................... 33
Appendix G – Heating Degree Day Data for All Incorporated Cities under the RRM Tariff ...... 35
Appendix H – Heating Degree Day Data for the City of Dallas ....................................................... 43
Appendix I – Heating Degree Data for Unincorporated Areas ........................................................ 51
Appendix J – Heating Degree Data for All Incorporated Cities within the ATM Coalition ......... 59
Appendix K – Rider WNA Calculation Instructions .......................................................................... 67
Appendix L – Sample Bill Calculation and WNA Worksheet .......................................................... 71
Atmos Energy (Mid-Tex) WNA Report 2020
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I. Introduction
Weather Normalization Adjustment (WNA) is standard within the natural gas utility industry and protects the customer and the natural gas provider. During the November through April billing periods, when customers’ bills are most sensitive to increased usage during a colder winter, residential and commercial customers will notice a line item called “Rider WNA” on their gas bill. The WNA refunds over-collections when weather is colder than normal and surcharges under collections when weather is warmer than normal. In this way, WNA helps remove variances on a customer’s bill caused by abnormal weather during the heating season. This report is intended to provide information on how WNA is calculated, and specifically the data that was used to calculate the Rider WNA on a customer’s bill during the 2019–2020 heating season. The report includes an explanation of how the WNA Factor is calculated (Section II), the monthly WNA Factors that resulted from the weather in the most recent heating season (Section III), the weather stations that are used for each city served by the Atmos Energy Mid-Tex Division (Appendix A), applicable WNA tariffs (Appendices B, C, D, and E) the base rates for temperature sensitive sales (Appendix F), normal and actual heating degree days for the prior year’s heating season (Appendices G, H, I, and J), and a sample bill calculation with step by step instructions for how to calculate the Rider WNA on a customer’s bill (Appendices K & L).
Atmos Energy (Mid-Tex) WNA Report 2020
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II. Computation of Weather Normalization Adjustment Factor
The Weather Normalization Adjustment Factor (WNAF) is calculated to the nearest one-hundredth cent per unit of gas (Ccf) by the following formula: (HSF x (NDD-ADD) ) WNAF = R x (BL + (HSF x ADD) ) Where
WNAF = Weather Normalization Adjustment Factor expressed in dollars per Ccf R = base rate of temperature sensitive sales expressed in dollars per Ccf (i.e.,
consumption charge rate from customer’s bill) (see Appendix E) BL = base load sales as stated on applicable WNA tariff (see Appendices B, C
or D) HSF = heat sensitivity factor by weather station as stated on applicable WNA
tariff (see Appendices B, C and D) NDD = billing cycle normal heating degree days, calculated as the simple ten-
year average of actual heating degree days (see Appendix F, G and H) ADD = billing cycle actual heating degree days, calculated by taking 65°F minus
the average of the high and low temperature, when the average temperature is below 65°F (see Appendix F, G and H)
The Weather Normalization Adjustment is computed as: WNA = WNAF x q
Where
WNA = Rider WNA as shown on a customer’s bill q = relevant sales quantity expressed in Ccf (i.e., “Usage in CCF” from
customer’s bill)
Atmos Energy (Mid-Tex) WNA Report 2020
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III. Monthly WNA Factors
The following tables represent the factors used to calculate the Weather Normalization Adjustment Factors (WNAF) for each calendar month during the 2019-2020 WNA season. It should be noted that the WNA Factor used to calculate the “Rider WNA” on a customer’s bill will differ from those shown below, as the heating degree days (NDD and ADD) are based on the customer’s specific billing cycle and not the calendar month.
All Incorporated Cities under the RRM Tariff
Table 1. Abilene Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.17423 0.1489 9.77 297 373 -$0.0302 December 2019 $0.17423 0.1489 9.77 553 472 $0.0262 January 2020 $0.17423 0.1489 9.77 615 467 $0.0484 February 2020 $0.17423 0.1489 9.77 465 489 -$0.0075 March 2020 $0.17423 0.1489 9.77 237 155 $0.0648 April 2020 $0.17423 0.1489 9.77 87 138 -$0.0436
Table 2. Abilene Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09924 0.7036 88.49 297 373 -$0.0151 December 2019 $0.09924 0.7036 88.49 553 472 $0.0134 January 2020 $0.09924 0.7036 88.49 615 467 $0.0248 February 2020 $0.09924 0.7036 88.49 465 489 -$0.0039 March 2020 $0.09924 0.7036 88.49 237 155 $0.0290 April 2020 $0.09924 0.7036 88.49 87 138 -$0.0192
Table 3. Austin Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.17423 0.1537 9.04 215 283 -$0.0347 December 2019 $0.17423 0.1537 9.04 420 381 $0.0154 January 2020 $0.17423 0.1537 9.04 495 327 $0.0759 February 2020 $0.17423 0.1537 9.04 327 360 -$0.0137 March 2020 $0.17423 0.1537 9.04 170 62 $0.1557 April 2020 $0.17423 0.1537 9.04 43 70 -$0.0365
Atmos Energy (Mid-Tex) WNA Report 2020
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Table 4. Austin Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09924 1.0000 201.48 215 283 -$0.0139 December 2019 $0.09924 1.0000 201.48 420 381 $0.0066 January 2020 $0.09924 1.0000 201.48 495 327 $0.0315 February 2020 $0.09924 1.0000 201.48 327 360 -$0.0058 March 2020 $0.09924 1.0000 201.48 170 62 $0.0407 April 2020 $0.09924 1.0000 201.48 43 70 -$0.0099
Table 5. DFW Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.17423 0.2202 13.07 245 346 -$0.0434 December 2019 $0.17423 0.2202 13.07 512 456 $0.0189 January 2020 $0.17423 0.2202 13.07 559 456 $0.0348 February 2020 $0.17423 0.2202 13.07 412 443 -$0.0108 March 2020 $0.17423 0.2202 13.07 207 124 $0.0789 April 2020 $0.17423 0.2202 13.07 66 122 -$0.0538
Table 6. DFW Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09924 1.1385 184.64 245 346 -$0.0197 December 2019 $0.09924 1.1385 184.64 512 456 $0.0090 January 2020 $0.09924 1.1385 184.64 559 456 $0.0165 February 2020 $0.09924 1.1385 184.64 412 443 -$0.0051 March 2020 $0.09924 1.1385 184.64 207 124 $0.0288 April 2020 $0.09924 1.1385 184.64 66 122 -$0.0196
Table 7. Waco Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.17423 0.1470 8.77 250 328 -$0.0351 December 2019 $0.17423 0.1470 8.77 494 460 $0.0114 January 2020 $0.17423 0.1470 8.77 554 420 $0.0487 February 2020 $0.17423 0.1470 8.77 393 417 -$0.0088 March 2020 $0.17423 0.1470 8.77 213 105 $0.1143 April 2020 $0.17423 0.1470 8.77 68 100 -$0.0349
Atmos Energy (Mid-Tex) WNA Report 2020
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Table 8. Waco Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09924 0.7744 135.70 250 328 -$0.0154 December 2019 $0.09924 0.7744 135.70 494 460 $0.0053 January 2020 $0.09924 0.7744 135.70 554 420 $0.0223 February 2020 $0.09924 0.7744 135.70 393 417 -$0.0040 March 2020 $0.09924 0.7744 135.70 213 105 $0.0382 April 2020 $0.09924 0.7744 135.70 68 100 -$0.0115
Table 9. Wichita Falls Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.17423 0.1468 11.40 343 451 -$0.0356 December 2019 $0.17423 0.1468 11.40 669 559 $0.0301 January 2020 $0.17423 0.1468 11.40 698 549 $0.0414 February 2020 $0.17423 0.1468 11.40 544 567 -$0.0062 March 2020 $0.17423 0.1468 11.40 293 215 $0.0464 April 2020 $0.17423 0.1468 11.40 118 170 -$0.0366
Table 10. Wichita Falls Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09924 0.5943 117.90 343 451 -$0.0165 December 2019 $0.09924 0.5943 117.90 669 559 $0.0144 January 2020 $0.09924 0.5943 117.90 698 549 $0.0198 February 2020 $0.09924 0.5943 117.90 544 567 -$0.0030 March 2020 $0.09924 0.5943 117.90 293 215 $0.0187 April 2020 $0.09924 0.5943 117.90 118 170 -$0.0140
Atmos Energy (Mid-Tex) WNA Report 2020
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All Incorporated Cities within the ATM-Coalition
Table 11. Abilene Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14846 0.1201 9.77 289 373 -$0.0274 December 2019 $0.14846 0.1201 9.77 579 472 $0.0287 January 2020 $0.14846 0.1201 9.77 610 467 $0.0387 February 2020 $0.14846 0.1201 9.77 453 489 -$0.0094 March 2020 $0.14846 0.1201 9.77 245 155 $0.0565 April 2020 $0.14846 0.1201 9.77 79 138 -$0.0399
Table 12. Abilene Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09165 0.5737 99.33 289 373 -$0.0141 December 2019 $0.09165 0.5737 99.33 579 472 $0.0152 January 2020 $0.09165 0.5737 99.33 610 467 $0.0205 February 2020 $0.09165 0.5737 99.33 453 489 -$0.0050 March 2020 $0.09165 0.5737 99.33 245 155 $0.0251 April 2020 $0.09165 0.5737 99.33 79 138 -$0.0174
Table 13. Austin Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14846 0.1493 10.38 206 283 -$0.0324 December 2019 $0.14846 0.1493 10.38 425 381 $0.0145 January 2020 $0.14846 0.1493 10.38 493 327 $0.0622 February 2020 $0.14846 0.1493 10.38 325 360 -$0.0121 March 2020 $0.14846 0.1493 10.38 179 62 $0.1321 April 2020 $0.14846 0.1493 10.38 44 70 -$0.0277
Atmos Energy (Mid-Tex) WNA Report 2020
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Table 14. Austin Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09165 0.8942 201.46 206 283 -$0.0139 December 2019 $0.09165 0.8942 201.46 425 381 $0.0067 January 2020 $0.09165 0.8942 201.46 493 327 $0.0275 February 2020 $0.09165 0.8942 201.46 325 360 -$0.0055 March 2020 $0.09165 0.8942 201.46 179 62 $0.0373 April 2020 $0.09165 0.8942 201.46 44 70 -$0.0081
Table15. DFW Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14846 0.2062 13.17 228 346 -$0.0427 December 2019 $0.14846 0.2062 13.17 511 456 $0.0157 January 2020 $0.14846 0.2062 13.17 557 456 $0.0288 February 2020 $0.14846 0.2062 13.17 405 443 -$0.0111 March 2020 $0.14846 0.2062 13.17 214 124 $0.0711 April 2020 $0.14846 0.2062 13.17 57 122 -$0.0519
Table 16. DFW Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09165 1.0046 183.71 228 346 -$0.0204 December 2019 $0.09165 1.0046 183.71 511 456 $0.0079 January 2020 $0.09165 1.0046 183.71 557 456 $0.0145 February 2020 $0.09165 1.0046 183.71 405 443 -$0.0056 March 2020 $0.09165 1.0046 183.71 214 124 $0.0269 April 2020 $0.09165 1.0046 183.71 57 122 -$0.0195
Table 17. Waco Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14846 0.1323 9.26 236 328 -$0.0343 December 2019 $0.14846 0.1323 9.26 497 460 $0.0104 January 2020 $0.14846 0.1323 9.26 550 420 $0.0394 February 2020 $0.14846 0.1323 9.26 386 417 -$0.0095 March 2020 $0.14846 0.1323 9.26 220 105 $0.0976 April 2020 $0.14846 0.1323 9.26 63 100 -$0.0323
Atmos Energy (Mid-Tex) WNA Report 2020
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Table 18. Waco Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09165 0.6398 124.57 236 328 -$0.0161 December 2019 $0.09165 0.6398 124.57 497 460 $0.0052 January 2020 $0.09165 0.6398 124.57 550 420 $0.0194 February 2020 $0.09165 0.6398 124.57 386 417 -$0.0046 March 2020 $0.09165 0.6398 124.57 220 105 $0.0352 April 2020 $0.09165 0.6398 124.57 63 100 -$0.0115
Table 19. Wichita Falls Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14846 0.1278 11.62 330 451 -$0.0331 December 2019 $0.14846 0.1278 11.62 671 559 $0.0256 January 2020 $0.14846 0.1278 11.62 690 549 $0.0327 February 2020 $0.14846 0.1278 11.62 531 567 -$0.0081 March 2020 $0.14846 0.1278 11.62 296 215 $0.0393 April 2020 $0.14846 0.1278 11.62 106 170 -$0.0364
Table 20. Wichita Falls Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.09165 0.5226 114.97 330 451 -$0.0165 December 2019 $0.09165 0.5226 114.97 671 559 $0.0132 January 2020 $0.09165 0.5226 114.97 690 549 $0.0168 February 2020 $0.09165 0.5226 114.97 531 567 -$0.0042 March 2020 $0.09165 0.5226 114.97 296 215 $0.0171 April 2020 $0.09165 0.5226 114.97 106 170 -$0.0150
Atmos Energy (Mid-Tex) WNA Report 2020
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City of Dallas
Table 21. DFW Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.14351 0.2208 13.75 228 346 -$0.0415 December 2019 $0.14351 0.2208 13.75 511 456 $0.0152 January 2020 $0.14351 0.2208 13.75 559 456 $0.0285 February 2020 $0.14351 0.2208 13.75 413 443 -$0.0085 March 2020 $0.14351 0.2208 13.75 207 124 $0.0639 April 2020 $0.14351 0.2208 13.75 66 122 -$0.0436
Table 22. DFW Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.08284 1.0478 214.83 228 346 -$0.0177 December 2019 $0.08284 1.0478 214.83 511 456 $0.0069 January 2020 $0.08284 1.0478 214.83 559 456 $0.0129 February 2020 $0.08284 1.0478 214.83 413 443 -$0.0038 March 2020 $0.08284 1.0478 214.83 207 124 $0.0209 April 2020 $0.08284 1.0478 214.83 66 122 -$0.0142
Unincorporated Areas
Table 23. Abilene Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.18653 0.1324 11.27 289 373 -$0.0342 December 2019 $0.18653 0.1324 11.27 579 472 $0.0358 January 2020 $0.18653 0.1324 11.27 610 467 $0.0483 February 2020 $0.18653 0.1324 11.27 453 489 -$0.0117 March 2020 $0.18653 0.1324 11.27 245 155 $0.0699 April 2020 $0.18653 0.1324 11.27 79 138 -$0.0493
Table 24. Abilene Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.10494 1.5905 135.40 289 373 -$0.0192 December 2019 $0.10494 1.5905 135.40 579 472 $0.0202 January 2020 $0.10494 1.5905 135.40 610 467 $0.0272 February 2020 $0.10494 1.5905 135.40 453 489 -$0.0066 March 2020 $0.10494 1.5905 135.40 245 155 $0.0393 April 2020 $0.10494 1.5905 135.40 79 138 -$0.0277
Atmos Energy (Mid-Tex) WNA Report 2020
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Table 25. Austin Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.18653 0.1658 11.51 206 283 -$0.0408 December 2019 $0.18653 0.1658 11.51 425 381 $0.0182 January 2020 $0.18653 0.1658 11.51 493 327 $0.0781 February 2020 $0.18653 0.1658 11.51 325 360 -$0.0152 March 2020 $0.18653 0.1658 11.51 179 62 $0.1661 April 2020 $0.18653 0.1658 11.51 44 70 -$0.0348
Table 26. Austin Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.10494 0.9314 170.24 206 283 -$0.0173 December 2019 $0.10494 0.9314 170.24 425 381 $0.0082 January 2020 $0.10494 0.9314 170.24 493 327 $0.0342 February 2020 $0.10494 0.9314 170.24 325 360 -$0.0068 March 2020 $0.10494 0.9314 170.24 179 62 $0.0502 April 2020 $0.10494 0.9314 170.24 44 70 -$0.0108
Table 27. DFW Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.18653 0.1887 13.47 228 346 -$0.0527 December 2019 $0.18653 0.1887 13.47 511 456 $0.0195 January 2020 $0.18653 0.1887 13.47 557 456 $0.0357 February 2020 $0.18653 0.1887 13.47 405 443 -$0.0138 March 2020 $0.18653 0.1887 13.47 214 124 $0.0859 April 2020 $0.18653 0.1887 13.47 57 122 -$0.0627
Table 28. DFW Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.10494 0.9850 123.81 228 346 -$0.0263 December 2019 $0.10494 0.9850 123.81 511 456 $0.0099 January 2020 $0.10494 0.9850 123.81 557 456 $0.0182 February 2020 $0.10494 0.9850 123.81 405 443 -$0.0070 March 2020 $0.10494 0.9850 123.81 214 124 $0.0378 April 2020 $0.10494 0.9850 123.81 57 122 -$0.0275
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Table 29. Waco Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.18653 0.1362 9.24 236 328 -$0.0434 December 2019 $0.18653 0.1362 9.24 497 460 $0.0131 January 2020 $0.18653 0.1362 9.24 550 420 $0.0497 February 2020 $0.18653 0.1362 9.24 386 417 -$0.0119 March 2020 $0.18653 0.1362 9.24 220 105 $0.1241 April 2020 $0.18653 0.1362 9.24 63 100 -$0.0411
Table 30. Waco Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.10494 1.0142 93.86 236 328 -$0.0230 December 2019 $0.10494 1.0142 93.86 497 460 $0.0070 January 2020 $0.10494 1.0142 93.86 550 420 $0.0266 February 2020 $0.10494 1.0142 93.86 386 417 -$0.0064 March 2020 $0.10494 1.0142 93.86 220 105 $0.0611 April 2020 $0.10494 1.0142 93.86 63 100 -$0.0202
Table 31. Wichita Falls Weather Station – Residential WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.18653 0.1264 11.24 330 451 -$0.0418 December 2019 $0.18653 0.1264 11.24 671 559 $0.0322 January 2020 $0.18653 0.1264 11.24 690 549 $0.0412 February 2020 $0.18653 0.1264 11.24 531 560 -$0.0083 March 2020 $0.18653 0.1264 11.24 296 215 $0.0497 April 2020 $0.18653 0.1264 11.24 106 170 -$0.0461
Table 32. Wichita Falls Weather Station – Commercial WNA Factors
Month R HSF BL NDD ADD WNAF November 2019 $0.10494 0.9253 110.38 330 451 -$0.0223 December 2019 $0.10494 0.9253 110.38 671 559 $0.0173 January 2020 $0.10494 0.9253 110.38 690 549 $0.0221 February 2020 $0.10494 0.9253 110.38 531 560 -$0.0045 March 2020 $0.10494 0.9253 110.38 296 215 $0.0254 April 2020 $0.10494 0.9253 110.38 106 170 -$0.0232
Atmos Energy (Mid-Tex) WNA Report 2020
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Appendix A - Weather Stations by City
Atmos Energy (Mid-Tex) WNA Report 2020
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City Name Weather Station City Name Weather Station Abbott DFW Blooming Grove DFW Abilene Abilene Blossom Wichita Falls Addison DFW Blue Mound DFW Alba DFW Blue Ridge Wichita Falls Albany Abilene Blum DFW Aledo DFW Bogata Wichita Falls Allen DFW Bonham Wichita Falls Alma DFW Bowie Wichita Falls Alvarado DFW Boyd DFW Alvord Wichita Falls Brashear DFW Angus DFW Brazos Bend DFW Anna Wichita Falls Bremond Waco Annona Wichita Falls Bridgeport DFW Anson Abilene Bristol DFW Archer City Wichita Falls Bronte Abilene Argyle DFW Brookston Wichita Falls Arlington DFW Brownsboro DFW Arp DFW Brownwood Abilene Arthur City Wichita Falls Bruceville Waco Athens DFW Bruceville Eddy Waco Aubrey Wichita Falls Brushy Creek Austin Aurora DFW Bryan Austin Austin Austin Buckholts Austin Avalon DFW Buffalo Waco Avery Wichita Falls Buffalo Gap Abilene Avoca Abilene Burkburnett Wichita Falls Azle DFW Burleson DFW Bagwell Wichita Falls Burnet Austin Baird Abilene Byers Wichita Falls Balch Springs DFW Caddo Mills DFW Ballinger Abilene Caldwell Austin Bandera Austin Calvert Waco Bangs Abilene Cameron Austin Bardwell DFW Campbell DFW Barry DFW Canton DFW Bartlett Austin Carbon Abilene Bartonville DFW Carey Wichita Falls Bedford DFW Carlsbad Abilene Bellevue Wichita Falls Carrollton DFW Bellmead Waco Cashion Community Wichita Falls Bells Wichita Falls Cayuga DFW Belton Austin Cedar Hill DFW Ben Wheeler DFW Cedar Park Austin Benbrook DFW Celeste Wichita Falls Benjamin Wichita Falls Celina Wichita Falls Bertram Austin Center Point Austin Beverly Hills Waco Centerville Waco Blackwell Abilene Chandler DFW Blanket Abilene Chapel Hill DFW
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City Name Weather Station City Name Weather Station
Before calculating your Rider WNA adjustment, you will need a copy of your Atmos Energy bill in question. If you don’t already have a copy of your bill, you can retrieve a copy from the Atmos Energy Account Center at atmosenergy.com. If you have already registered your account online, just click the login button in the upper left corner of the screen. If you have not registered your account online, now is a great time to do so. Just click register.
If the bill is for a residential or commercial customer and is from a billing period between November 2019 and April 2020, it should include a Rider WNA line under “Current Gas Charge Total”. This report will assist you in verifying this Rider WNA adjustment amount.
Step 2. Identify weather station
Next identify which weather station applies for the city where your gas meter is located. You can find this in Appendix A. Simply look for your city in the first column. Once you find your city, note the weather station listed in the second column. It will be one of the following: Abilene, Austin, DFW, Waco, or Wichita Falls.
Step 3. Identify Base Load (BL) and Heat Sensitivity Factors (HSF)
Several of the factors in the WNA calculations are dependent on which tariff is applicable to you. If you are a customer in an incorporated city other than Dallas, you will use the tariffs included in Appendix B & E. If you are a customer in the City of Dallas, you will use the tariff in Appendix C. If you are a customer in an unincorporated area, you will use the tariff in Appendix D.
Find the Base Use/Heat Use Factors table in the applicable tariff. Next, find the row that applies to the weather station you identified in step 2. If you are a residential customer, you will use the Base Use and Heat Use Factors in the first two columns, while commercial customers will use these factors from the last two columns.
Note the base use factor as BL and the heat use factor as HSF.
Step 4. Identify Base Rate (R)
Base rate information can be found in Appendix F. Identify the applicable base rate by referencing Table F-1 (incorporated cities under the RRM Tariff), Table F-2 (incorporated cities within the ATM Coalition) Table F-3 (City of Dallas) and Table F-4 (unincorporated areas), for the correct billing period (month when bill was issued) and customer type (residential or commercial). For verification, this rate should match the rate on your bill under “CURRENT GAS CHARGE TOTAL” next to “CONSUMP CHRG”.
Step 5. Calculate heating degree days (NDD and ADD).
The heating degree days are based on the actual days included in your billing period. On your bill, note the “from” and “to” service dates in the table in on the right side of the bill. Heating degree data can be found in Appendix G & J for customers in an incorporated city other than Dallas and Appendix H if you are a customer in the City of Dallas and Appendix I for customers in unincorporated areas. Once you locate the correct appendix, add the Normal Heating Degree Days (NDD) from the day before the first date of the billing period (i.e., FROM) to the day before the last date of the billing period (i.e., TO).
Note this total Normal Heating Degree Days as NDD.
Then add the Actual Heating Degree Days (ADD) from the day before the first date of the billing period (i.e., FROM) to the day before the last date of the billing period (i.e., TO).
Note this total Actual Heating Degree Days as ADD.
Step 6. Calculate WNA Factor
The WNA Factor can be calculated using the formula in Section II using each of these factors (BL, HSF, R, NDD, ADD)
Step 7. Identify Sales Quantity of Natural Gas (q)
From your applicable bill, find the “ACTUAL USAGE IN CCF” number in the table on the right.
Note this relevant sales quantity as q.
Step 8. Calculate Rider WNA
The Rider WNA amount can be calculated by multiplying the WNA Factor calculated in Step 6 by the relevant sales quantity (q) identified in Step 7.
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WNA WORKSHEET
Step 1. Get copy of Atmos Energy bill in question
Step 2. Identify weather station (Appendix A)
Weather station is .
Step 3. Identify Base Load (BL) and Heat Sensitivity Factors (HSF) (Appendix B, C, D, D.1 or E)
BL =
HSF=
Step 4. Identify Base Rate (R) (Appendix F)
R= $ /Ccf
Step 5. Calculate heating degree days (NDD and ADD) (Appendix G, H, I, I.1 or J)
NDD =
ADD =
Step 6. Calculate WNA Factor
(HSF x (NDD-ADD) ) WNAF = R x (BL + (HSF x ADD) )
WNAF = $ /Ccf
Step 7. Identify Sales Quantity of Natural Gas (q) (Customer bill in question)
q = Ccf
Step 8. Calculate Rider WNA
Rider WNA = $
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Appendix L – Sample Bill Calculation and WNA Worksheet
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Atmos Energy Sample Bill
Atmos Energy (Mid-Tex) WNA Report 2020
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WNA WORKSHEET
Step 1. Get copy of Atmos Energy bill in question
Step 2. Identify weather station (Appendix A)
Weather station is Wichita Falls .
Step 3. Identify Base Load (BL) and Heat Sensitivity Factors (HSF) (Appendix B, C, D, D.1 or E)
BL = 11.40
HSF= 0.14680
Step 4. Identify Base Rate (R) (Appendix F)
R= $0.17423/Ccf
Step 5. Calculate heating degree days (NDD and ADD) (Appendix G, H, I, I.1 or J)
Billing cycle is 1/4/2020 through 2/4/2020 (subtract one day from start/end date for NDD and ADD calculations).
NDD = 719
ADD = 546
Step 6. Calculate WNA Factor
((HSF x (NDD-ADD)) WNAF = R x ((BL + (HSF x ADD)) ((0.1468 x (719 - 546)) WNAF = 0.04071 x (11.40 + (0.1468 x 546)) WNAF = $0.0483314/Ccf Step 7. Identify Sales Quantity of Natural Gas (q) (Customer bill in question)