History of Gas Charges Due to the Operation of Rider 2 (Cents per Therm) Factors for Transportation Customers (Riders FST, SST, P, CFY and AGG) Non- Total Standby Standby Aggregation Commodity Commodity Hub Credit Gas Demand Commodity Balancing Storage Hub Credit 100% of Date Gas Charge Gas Charge Gas Charge 1 (1) Charge Charge (2) Charge (3) Gas Charge Gas Charge (4) Gas Charge 2 (1) AMIP February 1, 2018 27.94 4.53 (0.06) 32.41 24.14 n/a n/a 0.58 (0.02) n/a January 1, 2018 28.34 4.78 (0.16) 32.96 25.05 n/a n/a 0.61 (0.07) 37.86 See Footnotes on Last Page of Gas Charges History
History of Gas Charges Due to the Operation of Rider 2 (Cents per Therm) Factors for Transportation Customers (Riders FST, SST, P, CFY and AGG) Non- Total Standby Standby Aggregation Commodity Commodity Hub Credit Gas Demand Commodity Balancing Storage Hub Credit 100% of Date Gas Charge Gas Charge Gas Charge 1 (1) Charge Charge (2) Charge (3) Gas Charge Gas Charge (4) Gas Charge 2 (1) AMIP December 1, 2017 34.16 6.30 (0.14) 40.32 34.54 n/a n/a 0.91 (0.05) 28.35 November 1, 2017 27.79 6.02 0.00 33.81 31.47 n/a n/a 0.82 0.00 29.65 October 1, 2017 28.73 5.49 (0.01) 34.21 27.65 n/a n/a 0.69 0.00 27.78 September 1, 2017 31.04 4.98 (0.01) 36.01 25.20 n/a n/a 0.61 0.00 28.66 August 1, 2017 32.78 4.71 0.09 37.58 24.25 n/a n/a 0.58 0.01 28.14 July 1, 2017 35.39 4.53 0.09 40.01 23.94 n/a n/a 0.56 0.02 28.01 June 1, 2017 34.12 4.45 (0.11) 38.46 23.77 n/a n/a 0.56 (0.02) 27.92 May 1, 2017 32.63 4.42 (0.09) 36.96 24.03 n/a n/a 0.57 (0.02) 30.13 April 1, 2017 32.12 4.46 (0.30) 36.28 24.02 n/a n/a 0.56 (0.08) 29.56 March 1, 2017 36.26 3.80 (0.41) 39.65 22.50 n/a n/a 0.52 (0.15) 28.38 February 1, 2017 37.48 4.58 (0.24) 41.82 24.91 n/a n/a 0.59 0.47 28.11 January 1, 2017 34.01 5.28 (0.25) 39.04 27.69 n/a n/a 0.68 (0.10) 32.93 See Footnotes on Last Page of Gas Charges History
History of Gas Charges Due to the Operation of Rider 2 (Cents per Therm) Factors for Transportation Customers (Riders FST, SST, P, CFY and AGG) Non- Total Standby Standby Aggregation Commodity Commodity Hub Credit Gas Demand Commodity Balancing Storage Hub Credit 100% of Date Gas Charge Gas Charge Gas Charge 1 (1) Charge Charge (2) Charge (3) Gas Charge Gas Charge (4) Gas Charge 2 (1) AMIP December 1, 2016 31.39 7.06 (0.16) 38.29 41.62 n/a n/a 1.14 (0.06) 36.29 November 1, 2016 32.38 6.51 0.00 38.89 35.41 n/a n/a 0.95 0.00 24.14 October 1, 2016 30.02 6.04 0.00 36.06 31.10 n/a n/a 0.81 0.00 28.56 September 1, 2016 29.17 5.75 0.00 34.92 28.98 n/a n/a 0.75 0.00 28.89 August 1, 2016 24.06 5.53 (0.01) 29.58 27.87 n/a n/a 0.70 0.00 27.35 July 1, 2016 21.92 5.13 (0.03) 27.02 26.68 n/a n/a 0.67 0.00 27.24 June 1, 2016 21.45 3.29 0.01 24.75 21.27 n/a n/a 0.49 0.00 24.55 May 1, 2016 18.97 4.87 0.09 23.93 26.07 n/a n/a 0.65 0.02 19.06 April 1, 2016 20.00 4.72 (0.09) 24.63 25.97 n/a n/a 0.65 (0.03) 19.02 March 1, 2016 22.98 4.95 0.15 28.08 27.14 n/a n/a 0.64 0.06 17.94 February 1, 2016 23.93 5.83 (0.23) 29.53 30.32 n/a n/a 0.73 (0.07) 19.94 January 1, 2016 21.97 5.45 (0.47) 26.95 28.70 n/a n/a 0.68 (0.14) 23.38 See Footnotes on Last Page of Gas Charges History
History of Gas Charges Due to the Operation of Rider 2 (Cents per Therm) Factors for Transportation Customers (Riders FST, SST, P, CFY and AGG) Non- Total Standby Standby Aggregation Commodity Commodity Hub Credit Gas Demand Commodity Balancing Storage Hub Credit 100% of Date Gas Charge Gas Charge Gas Charge 1 (1) Charge Charge (2) Charge (3) Gas Charge Gas Charge (4) Gas Charge 2 (1) AMIP December 1, 2015 23.97 6.15 (0.12) 30.00 37.61 n/a n/a 0.92 (0.04) 19.43 November 1, 2015 27.29 6.03 0.00 33.32 34.37 n/a n/a 0.83 0.00 21.41 October 1, 2015 30.25 6.16 0.00 36.41 33.67 n/a n/a 0.81 0.00 23.93 September 1, 2015 33.80 5.48 (0.03) 39.25 29.65 n/a n/a 0.68 0.00 26.94 August 1, 2015 34.15 4.78 0.11 39.04 26.93 n/a n/a 0.57 0.02 28.46 July 1, 2015 30.92 4.79 0.26 35.97 27.07 n/a n/a 0.58 0.04 28.34 June 1, 2015 30.04 4.08 0.06 34.18 25.13 n/a n/a 0.52 0.01 27.03 May 1, 2015 30.99 4.03 (0.34) 34.68 25.15 n/a n/a 0.52 (0.06) 28.10 April 1, 2015 30.10 4.72 0.52 35.34 26.77 n/a n/a 0.57 0.12 25.88 March 1, 2015 31.90 5.07 0.32 37.29 27.23 n/a n/a 0.59 0.09 29.00 February 1, 2015 26.31 5.38 (0.28) 31.41 28.44 n/a n/a 0.62 (0.09) 39.78 January 1, 2015 34.77 5.33 (0.34) 39.76 28.22 n/a n/a 0.61 (0.12) 30.41 See Footnotes on Last Page of Gas Charges History
History of Gas Charges Due to the Operation of Rider 2 (Cents per Therm) Factors for Transportation Customers (Riders FST, SST, P, CFY and AGG) Non- Total Standby Standby Aggregation Commodity Commodity Hub Credit Gas Demand Commodity Balancing Storage Hub Credit 100% of Date Gas Charge Gas Charge Gas Charge 1 (1) Charge Charge (2) Charge (3) Gas Charge Gas Charge (4) Gas Charge 2 (1) AMIP December 1, 2014 53.47 4.54 (0.09) 57.92 29.81 n/a n/a 0.68 (0.03) 34.88 November 1, 2014 46.31 5.29 0.00 51.60 34.86 n/a n/a 0.81 0.00 43.75 October 1, 2014 44.72 4.02 (0.01) 48.73 25.41 n/a n/a 0.58 0.00 38.35 September 1, 2014 65.28 3.88 (0.03) 69.13 24.67 n/a n/a 0.56 0.00 39.44 August 1, 2014 71.21 3.67 0.23 75.11 23.60 n/a n/a 0.56 0.03 39.18 July 1, 2014 83.35 2.58 0.34 86.27 19.87 n/a n/a 0.45 0.05 41.12 June 1, 2014 79.09 2.19 (0.25) 81.03 19.16 n/a n/a 0.43 (0.05) 46.43 May 1, 2014 83.21 2.30 (0.93) 84.58 19.61 n/a n/a 0.43 (0.18) 45.91 April 1, 2014 116.89 1.67 0.59 119.15 16.96 n/a n/a 0.36 0.14 47.18 March 1, 2014 91.33 1.66 0.37 93.36 15.22 n/a n/a 0.31 0.10 93.50 February 1, 2014 47.90 4.32 (0.39) 51.83 23.27 n/a n/a 0.55 (0.12) 119.46 January 1, 2014 43.53 4.73 (0.53) 47.73 24.83 n/a n/a 0.60 (0.16) 79.27 (1) Hub Credit Gas Charge (HCGC 1 ) applies to Retail and CFY customers. Hub Credit Gas Charge (HCGC 2 ) applies to Large Volume Transportation customers. (2) As of May 1, 2012 the Standby Demand Charge is equal to the effective monthly Demand Gas Charge as filed with the Illinois Commerce Commission. From January 28, 2010 through April 30, 2012 the Standby Demand Charge was 86% of the effective monthly Demand Gas Charge. From August 1, 2008 through January 27, 2010 the Standby Demand Charge was 87% of the effective monthly Demand Gas Charge. Prior to August 1, 2008, the Standby Demand Charge was 50% of the effective monthly Demand Gas Charge. (3) As of January 28, 2010 the Standby Commodity Charge is based on Daily and Average Monthly Index Prices (AMIP) based on published citygate prices in Platt's "Gas Daily". As a result, the Standby Commodity Charge is no longer reported under Rider 2. August 1, 2008 through January 27, 2010: Standby Commodity Charge was the Commodity Gas Charge plus 13% of the Non-Commodity Gas Charge. Prior to August 1, 2008, Standby Commodity Charge was the Commodity Gas Charge plus 50% of the Non-Commodity Gas Charge excluding the Transition Surcharge. (4) As of May 1, 2012 the Storage Gas Charge replaces the Aggregation Balancing Gas Charge for Rider CFY and the Standby Demand Charge for Rider SST. (5) Preliminary See Footnotes on Last Page of Gas Charges History
BTU Factors in Effect (Number of Therms Per 100 Cubic Feet of Gas) Calendar Years 2008 Through Present Date 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Jan. 1 1.012 1.011 1.012 1.008 1.010 1.011 1.018 1.026 1.034 1.035 1.037 Feb. 1 1.012 1.013 1.011 1.008 1.010 1.012 1.018 1.028 1.035 1.035 1.037 Mar. 1 1.012 1.014 1.010 1.008 1.010 1.012 1.019 1.029 1.036 1.035 Apr. 1 1.012 1.014 1.010 1.008 1.010 1.013 1.021 1.030 1.036 1.035 May 1 1.011 1.014 1.009 1.008 1.010 1.014 1.022 1.032 1.036 1.035 Jun. 1 1.011 1.014 1.009 1.008 1.010 1.015 1.023 1.032 1.036 1.035 Jul. 1 1.011 1.013 1.009 1.009 1.010 1.015 1.023 1.033 1.035 1.036 Aug. 1 1.011 1.013 1.008 1.009 1.011 1.016 1.023 1.033 1.035 1.036 Sep. 1 1.011 1.013 1.008 1.009 1.011 1.016 1.023 1.034 1.035 1.037 Oct. 1 1.011 1.013 1.008 1.010 1.011 1.016 1.024 1.034 1.035 1.037 Nov. 1 1.011 1.013 1.008 1.010 1.011 1.016 1.024 1.034 1.035 1.037 Dec. 1 1.011 1.013 1.008 1.010 1.011 1.017 1.025 1.034 1.035 1.036
Recovery Adjustment Under Rider 11 Incremental Costs for Environmental Actvities (Cents Per Therm) Calendar Years 2008 Through Present Date 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 Jan. 1 3.26 2.74 0.86 0.19 0.34 1.64 2.05 1.62 1.39 2.39 1.51 Feb. 1 3.23 2.72 0.88 0.20 0.32 1.71 2.17 1.60 1.38 2.35 1.47 Mar. 1 3.40 2.46 0.48 0.29 0.25 2.01 2.14 1.40 1.56 2.32 Apr. 1 2.90 2.48 0.52 0.29 0.25 2.02 2.13 1.36 1.67 2.23 May 1 3.09 2.31 0.52 0.31 0.28 2.00 2.19 1.34 1.81 2.09 Jun. 1 3.01 2.20 0.29 0.35 0.45 2.08 2.01 1.38 1.96 1.89 Jul. 1 3.22 2.04 0.37 0.31 0.49 2.11 1.99 1.43 1.88 1.92 Aug. 1 3.22 1.68 0.37 0.33 0.54 2.21 1.99 1.38 1.92 1.90 Sep. 1 3.24 1.54 0.29 0.32 1.00 1.99 1.96 1.38 2.03 1.83 Oct. 1 3.29 1.31 0.27 0.32 1.05 2.00 1.94 1.36 2.20 1.68 Nov. 1 3.06 1.22 0.25 0.33 1.29 1.96 1.88 1.33 2.31 1.56 Dec. 1 2.75 0.88 0.19 0.34 1.58 2.04 1.67 1.37 2.30 1.61
Adjustments Under Rider EEP (Dollars per Customer per Month) From Inception Through Present To Classification No. 1 Classification No. 2 5/1/2008 12/31/2008 0.45 2.27 1/1/2009 6/30/2009 0.29 1.51 7/1/2009 6/30/2010 0.44 2.28 7/1/2010 10/21/2010 0.45 2.31 10/22/2010 6/30/2011 0.47 2.34 10/1/2011 6/30/2012 (0.51) (0.78) 1/1/2014 1/31/2014 0.17 1.57
Infrastructure Cost Recovery (Percentage Applied to ICR Base Rate Revenues) Inception Through Present From To Percentage Charge Percentage Remand Refund 4/1/2011 12/31/2011 0.0117 1/1/2012 6/30/2012 0.0000 7/1/2012 3/31/2013 0.0054
Adjustments Under Rider UEA (Dollars per Customer per Month) Inception Through Present Classification No. 1 Heating Classification No. 1 Non-Heating Classification No. 2 Classification No. 4 Classification No. 8 From To Sales Transp. Sales Transp. Sales Transp. Sales Transp. Sales Transp. 4/1/2010 5/31/2010 1.12 0.42 1.12 0.42 2.05 0.42 18.13 18.13 6/1/2010 12/31/2010 0.80 0.70 0.80 0.70 1.44 0.41 13.35 13.35 1/1/2011 5/31/2011 (0.32) 0.28 (0.32) 0.28 (0.61) (0.01) (4.78) (4.78) 6/1/2011 5/31/2012 (0.65) (0.10) (0.65) (0.10) (1.04) (0.46) (6.71) (6.71) 6/1/2012 5/31/2013 (0.72) (0.20) (0.72) (0.20) (1.10) (0.57) (3.50) (3.50) 6/1/2013 5/31/2014 (0.46) (0.25) (0.46) (0.25) (0.94) (0.50) (1.39) (1.39) 6/1/2014 5/31/2015 (0.54) (0.29) (0.54) (0.29) (2.41) (1.18) 122.88 122.88 6/1/2015 8/31/2015 (1.15) (0.27) (0.09) (0.08) (3.22) (1.08) (131.81) (131.81) 9/1/2015 5/31/2016 (1.17) (0.27) (0.09) (0.07) (3.25) (1.06) (130.61) (130.61) 6/1/2016 8/31/2016 2.14 0.94 0.23 0.06 2.38 1.06 (0.64) (0.64) 9/1/2016 5/31/2017 2.10 0.94 0.23 0.06 2.22 1.06 (3.31) (3.31) 6/1/2017 8/31/2017 1.57 0.76 0.22 0.07 1.76 0.87 9/1/2017 5/31/2018 1.48 0.72 0.22 0.07 1.77 0.88 1.40 1.40
Adjustments Under Rider UEA-GC (Uncollectible Factor) Inception Through Present From To 1/21/2012 6/26/2013 6/27/2013 1/27/2015 1/28/2015 Classification No. 1 Non-Heating Classification No. 1 Heating Classification No. 2 Classification No. 4 0.0341 0.0341 0.0157 0.0000 0.0461 0.0372 0.0139 0.0001 0.0508 0.0288 0.0123 0.0000
Adjustments Under Rider VBA (Cents per Therm) From To 2010 Through Present Classification No. 1 Classification No. 1 Heating Non-Heating Classification No. 2 Sales Transp. Sales Transp. Sales Transp. 1/1/2010 1/31/2010 0.78 0.44 0.78 0.44 1.51 0.65 2/1/2010 2/28/2010 0.02 0.55 0.02 0.55 0.88 (0.22) 3/1/2010 3/31/2010 (0.83) (0.83) (0.83) (0.83) (1.19) (1.19) 4/1/2010 4/30/2010 (2.03) (4.17) (2.03) (4.17) (4.77) (4.66) 5/1/2010 5/31/2010 9.94 7.80 9.94 7.80 0.73 0.84 6/1/2010 6/30/2010 16.27 14.13 16.27 14.13 9.86 9.97 7/1/2010 7/31/2010 9.87 7.73 9.87 7.73 1.38 1.49 8/1/2010 8/31/2010 (4.34) (6.48) (4.34) (6.48) (2.20) (2.09) 9/1/2010 9/30/2010 2.02 (0.12) 2.02 (0.12) (0.74) (0.63) 10/1/2010 10/31/2010 1.19 (0.95) 1.19 (0.95) (0.13) (0.02) 11/1/2010 11/30/2010 2.43 0.29 2.43 0.29 0.90 1.01 12/1/2010 12/31/2010 1.82 (0.32) 1.82 (0.32) 0.76 0.87 1/1/2011 1/31/2011 1.07 1.07 1.07 1.07 0.94 0.94 2/1/2011 2/28/2011 (2.90) (2.90) (2.90) (2.90) (2.62) (2.62) 3/1/2011 3/31/2011 (2.77) (2.77) (2.77) (2.77) (2.39) (2.39) 4/1/2011 4/30/2011 (2.37) (2.37) (2.37) (2.37) (3.39) (3.39) 5/1/2011 5/31/2011 (3.26) (3.26) (3.26) (3.26) (5.10) (5.10) 6/1/2011 6/30/2011 1.16 1.16 1.16 1.16 (0.48) (0.48) 7/1/2011 7/31/2011 (1.25) (1.25) (1.25) (1.25) (4.15) (4.15) 8/1/2011 8/31/2011 (17.40) (17.40) (17.40) (17.40) (8.03) (8.03) 9/1/2011 9/30/2011 1.29 1.29 1.29 1.29 (1.60) (1.60) 10/1/2011 10/31/2011 1.13 1.13 1.13 1.13 (0.61) (0.61) 11/1/2011 11/30/2011 1.55 1.55 1.55 1.55 0.11 0.11 12/1/2011 12/31/2011 0.51 0.51 0.51 0.51 (0.12) (0.12) 1/1/2012 1/31/2012 0.58 0.58 0.58 0.58 0.80 0.80 2/1/2012 2/29/2012 1.40 1.40 1.40 1.40 1.04 1.04 3/1/2012 3/31/2012 0.00 0.00 0.00 0.00 0.00 0.00 4/1/2012 12/31/2012 0.56 0.56 0.56 0.56 0.54 0.54 4/1/2013 12/31/2013 2.74 2.74 2.74 2.74 1.36 1.36 4/1/2014 12/31/2014 (3.93) (3.93) (3.25) (3.25) (2.32) (2.32) 4/1/2015 12/31/2015 (5.17) (5.17) 0.15 0.15 (2.56) (2.56) 4/1/2016 12/31/2016 (0.47) (0.47) 2.83 2.83 (0.87) (0.87) 4/1/2017 12/31/2017 0.62 0.62 2.31 2.31 (0.11) (0.11) In the event of a discrepancy, documents on file with the Illinois Commerce Commission would supersede the information above.
Adjustments Under Rider EOA (Dollar per Therm) Inception Through Present From To Classification No. 1 Classification No. 2 Classification Nos. 4, 5, 7 and 8 7/1/2011 5/31/2012 0.0079 0.0081 0.0036 6/1/2012 8/31/2012 0.0096 0.0171 0.0102 9/1/2012 10/31/2012 0.0061 0.0180 0.0116 11/1/2012 5/31/2013 0.0107 0.0175 0.0114 6/1/2013 8/31/2013 0.0129 0.0341 0.0274 9/1/2013 5/31/2014 0.0086 0.0359 0.0262 6/1/2014 7/31/2014 0.0105 0.0203 0.0151 8/1/2014 8/31/2014 0.0109 0.0219 0.0145 9/1/2014 5/31/2015 0.0052 0.0074 (0.0064) 6/1/2015 8/31/2015 0.0092 0.0197 0.0141 9/1/2015 5/31/2016 0.0047 0.0158 0.0095 6/1/2016 8/31/2016 0.0103 0.0279 0.0205 9/1/2016 5/31/2017 0.0094 0.0248 0.0157 6/1/2017 12/31/2017 0.0075 0.0121 0.0046 1/1/2018 5/31/2018 0.0134 0.0214 0.0136
Rider SSC - Storage Charge (Cents per Therm) From Inception Through Present To Storage Banking Charge(1) Storage Charge(2) 1/21/2012 5/31/2012 0.550 4.234 6/1/2012 5/31/2013 0.550 4.121 6/1/2013 6/26/2013 0.550 3.920 6/27/2013 7/31/2013 0.490 3.514 8/1/2013 12/31/2013 0.490 3.734 1/1/2014 5/31/2014 0.490 3.771 6/1/2014 7/31/2014 0.510 3.524 8/1/2014 1/27/2015 0.510 2.714 1/28/2015 2/25/2015 0.570 3.121 2/26/2015 5/31/2015 0.560 3.079 6/1/2015 7/31/2015 0.530 3.514 8/1/2015 5/31/2016 0.530 3.224 6/1/2016 7/31/2016 0.570 3.704 8/1/2016 5/31/2017 0.570 4.284 6/1/2017 7/31/2017 0.610 3.889 8/1/2017 5/31/2018 0.610 4.429 (1) Per therm of storage capacity (2) Per therm of gas delivered
Qualifying Infrastructure Plant 2016 Through Present From To Percentage 1/1/2016 1/31/2016 2.78% 2/1/2016 2/29/2016 3.04% 3/1/2016 3/31/2016 4.27% 4/1/2016 4/30/2016 6.66% 5/1/2016 5/31/2016 8.70% 6/1/2016 6/30/2016 9.17% 7/1/2016 7/31/2016 10.09% 8/1/2016 8/31/2016 10.63% 9/1/2016 9/30/2016 10.69% 10/1/2016 10/31/2016 8.43% 11/1/2016 11/30/2016 6.99% 12/1/2016 12/31/2016 5.31% 1/1/2017 1/31/2017 4.97% 2/1/2017 2/28/2017 5.10% 3/1/2017 3/31/2017 6.16% 4/1/2017 4/30/2017 8.83% 5/1/2017 5/31/2017 11.08% 6/1/2017 6/30/2017 12.54% 7/1/2017 7/31/2017 13.63% 8/1/2017 8/31/2017 14.10% 9/1/2017 9/30/2017 14.09% 10/1/2017 10/31/2017 11.54% 11/1/2017 11/30/2017 9.29% 12/1/2017 12/31/2017 7.74% 1/1/2018 1/31/2018 6.98% 2/1/2018 2/28/2018 6.88%