Consumers Energy Company Credit B Interest Calculation Short Term Interest Rates Six Month Refund For Residential Gas Rates A and A 1

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1 Credit B Interest Calculation Short Term Interest Rates Six Month Refund For Residential Gas Rates A and A 1 Exhibit WAP 1 Page 1 of 2 Witness William A. Peloquin 1 Jan 2018 $ 3,168,806 $ 3,168,806 $ 1,584, % $ 2,339 $ 2,339 2 Feb 2018 $ 3,168,806 $ 6,116,230 $ 9,285,036 $ 6,226, % $ 8,053 $ 10,393 3 Mar 2018 $ 9,285,036 $ 4,855,024 $ 14,140,060 $ 11,712, % $ 17,063 $ 27,456 4 Apr 2018 $ 14,140,060 $ 4,612,782 $ 18,752,842 $ 16,446, % $ 25,671 $ 53,127 5 May 2018 $ 18,752,842 $ 2,309,652 $ 21,062,494 $ 19,907, % $ 33,738 $ 86,865 6 Jun 2018 $ 21,062,494 $ 874,755 $ 21,937,249 $ 21,499, % $ 36,113 $ 122,978 7 Jul 2018 $ 21,937, % $ 40,401 $ 163,379 8 Aug 2018 $ 21,937, % $ 49,713 $ 213,092 9 Sep 2018 $ 21,937, % $ 49,611 $ 262, Oct 2018 $ 21,937, % $ 52,817 $ 315, Nov 2018 $ 21,937, % $ 52,615 $ 368, Dec 2018 $ 21,937,249 $ (3,613,357) $ 18,323,892 $ 20,130, % $ 51,316 $ 419, Jan 2019 $ 18,743,342 $ (5,028,902) $ 13,714,441 $ 16,228, % $ 42,518 $ 461, Feb 2019 $ 13,714,441 $ (4,868,673) $ 8,845,768 $ 11,280, % $ 27,413 $ 489, Mar 2019 $ 8,845,768 $ (4,233,753) $ 4,612,016 $ 6,728, % $ 18,581 $ 507, Apr 2019 $ 4,612,016 $ (2,979,264) $ 1,632,752 $ 3,122, % $ 8,558 $ 516, May 2019 $ 1,632,752 $ (1,632,752) $ 0 $ 816, % $ 2,370 $ 518, Jan % % 19 Feb % % 20 Mar % % 21 Apr % % 22 May % % 23 Jun % % 24 Jul % % 25 Aug % % 26 Sep % % 27 Ocy % % 28 Nov % % mcf 29 Dec % % 21,046, % 30 Jan % % 29,291, % 31 Feb % % 28,357, % 32 Mar % % 24,659, % 33 Apr % % 17,352, % 34 May % % 9,510, % 130,218, %

2 Credit B Interest Calculation Overall Rate of Return Six Month Refund For Residential Gas Rates A and A 1 Exhibit WAP 1 Page 2 of 2 1 Jan 2018 $ 3,168,806 $ 3,168,806 $ 1,584, % $ 8,034 $ 8,034 2 Feb 2018 $ 3,168,806 $ 6,116,230 $ 9,285,036 $ 6,226, % $ 28,518 $ 36,551 3 Mar 2018 $ 9,285,036 $ 4,855,024 $ 14,140,060 $ 11,712, % $ 59,387 $ 95,939 4 Apr 2018 $ 14,140,060 $ 4,612,782 $ 18,752,842 $ 16,446, % $ 80,700 $ 176,639 5 May 2018 $ 18,752,842 $ 2,309,652 $ 21,062,494 $ 19,907, % $ 100,940 $ 277,579 6 Jun 2018 $ 21,062,494 $ 874,755 $ 21,937,249 $ 21,499, % $ 105,497 $ 383,076 7 Jul 2018 $ 21,937, % $ 111,231 $ 494,306 8 Aug 2018 $ 21,937, % $ 111,231 $ 605,537 9 Sep 2018 $ 21,937, % $ 107,643 $ 713, Oct 2018 $ 21,937, % $ 111,231 $ 824, Nov 2018 $ 21,937, % $ 107,643 $ 932, Dec 2018 $ 21,937,249 $ (3,712,662) $ 18,224,587 $ 20,080, % $ 101,819 $ 1,033, Jan 2019 $ 19,258,459 $ (5,167,109) $ 14,091,350 $ 16,674, % $ 84,549 $ 1,118, Feb 2019 $ 14,091,350 $ (5,002,477) $ 9,088,873 $ 11,590, % $ 53,080 $ 1,171, Mar 2019 $ 9,088,873 $ (4,350,107) $ 4,738,766 $ 6,913, % $ 35,056 $ 1,206, Apr 2019 $ 4,738,766 $ (3,061,142) $ 1,677,624 $ 3,208, % $ 15,742 $ 1,222, May 2019 $ 1,677,624 $ (1,677,624) $ (0) $ 838, % $ 4,253 $ 1,226, Jan % % 19 Feb % % 20 Mar % % 21 Apr % % 22 May % % 23 Jun % % 24 Jul % % 25 Aug % % 26 Sep % % 27 Ocy % % 28 Nov % % mcf 29 Dec % % 21,046, % 30 Jan % % 29,291, % 31 Feb % % 28,357, % 32 Mar % % 24,659, % 33 Apr % % 17,352, % 34 May % % 9,510, % ,218, %

3 IRM Interest Expense Calculation Short Term Interest Rates Six Month Refund From Residential Gas Rates A and A 1 Exhibit WAP 2 Page 1 of 2 1 Jan 2018 $ 115,253 $ 115,253 $ 57, % $ 85 $ 85 2 Feb 2018 $ 115,253 $ 116,204 $ 231,457 $ 173, % $ 224 $ Mar 2018 $ 231,457 $ 114,942 $ 346,399 $ 288, % $ 421 $ Apr 2018 $ 346,399 $ 114,305 $ 460,704 $ 403, % $ 630 $ 1,360 5 May 2018 $ 460,704 $ 114,644 $ 575,348 $ 518, % $ 878 $ 2,238 6 Jun 2018 $ 575,348 $ 114,342 $ 689,690 $ 632, % $ 1,062 $ 3,300 7 Jul 2018 $ 689, % $ 1,270 $ 4,571 8 Aug 2018 $ 689, % $ 1,319 $ 5,890 9 Sep 2018 $ 689, % $ 1,324 $ 7, Oct 2018 $ 689, % $ 1,417 $ 8, Nov 2018 $ 689, % $ 1,418 $ 10, Dec 2018 $ 689,690 $ (116,854) $ 572,836 $ 631, % $ 1,386 $ 11, Jan 2019 $ 584,270 $ (116,854) $ 467,416 $ 525, % $ 1,192 $ 12, Feb 2019 $ 467,416 $ (116,854) $ 350,562 $ 408, % $ 863 $ 13, Mar 2019 $ 350,562 $ (116,854) $ 233,708 $ 292, % $ 703 $ 14, Apr 2019 $ 233,708 $ (116,854) $ 116,854 $ 175, % $ 420 $ 14, May 2019 $ 116,854 $ (116,854) $ (0) $ 58, % $ 149 $ 14, Jan % % 19 Feb % % 20 Mar % % 21 Apr % % 22 May % % 23 Jun % % 24 Jul % % 25 Aug % % 26 Sep % % 27 Ocy % % 28 Nov % % 29 Dec % % 30 Jan % % 31 Feb % % 32 Mar % % 33 Apr % % 34 May % %

4 IRM Interest Expense Calculation Overall Rate of Return One Month Refund For Residential Gas Rates A and A 1 Exhibit WAP 2 Page 2 of 2 Witness: William A. Pedloquin 1 Jan 2018 $ 115,253 $ 115,253 $ 57, % $ 292 $ Feb 2018 $ 115,253 $ 116,204 $ 231,457 $ 173, % $ 794 $ 1,086 3 Mar 2018 $ 231,457 $ 114,942 $ 346,399 $ 288, % $ 1,465 $ 2,551 4 Apr 2018 $ 346,399 $ 114,305 $ 460,704 $ 403, % $ 1,980 $ 4,531 5 May 2018 $ 460,704 $ 114,644 $ 575,348 $ 518, % $ 2,627 $ 7,158 6 Jun 2018 $ 575,348 $ 114,342 $ 689,690 $ 632, % $ 3,104 $ 10,262 7 Jul 2018 $ 689, % $ 3,497 $ 13,759 8 Aug 2018 $ 689, % $ 3,497 $ 17,256 9 Sep 2018 $ 689, % $ 3,384 $ 20, Oct 2018 $ 689, % $ 3,497 $ 24, Nov 2018 $ 689, % $ 3,384 $ 27, Dec 2018 $ 689,690 $ (120,067) $ 569,623 $ 629, % $ 3,193 $ 30, Jan 2019 $ 600,337 $ (120,067) $ 480,269 $ 540, % $ 2,740 $ 33, Feb 2019 $ 480,269 $ (120,067) $ 360,202 $ 420, % $ 1,925 $ 35, Mar 2019 $ 360,202 $ (120,067) $ 240,135 $ 300, % $ 1,522 $ 36, Apr 2019 $ 240,135 $ (120,067) $ 120,068 $ 180, % $ 884 $ 37, May 2019 $ 120,068 $ (120,067) $ 0 $ 60, % $ 304 $ 38, Jan % % 19 Feb % % 20 Mar % % 21 Apr % % 22 May % % 23 Jun % % 24 Jul % % 25 Aug % % 26 Sep % % 27 Ocy % % 28 Nov % % 29 Dec % % 30 Jan % % 31 Feb % % 32 Mar % % 33 Apr % % 34 May % %

5 Credit B Interest Expense Calculation Short Term Interest Rate One Month Refund For Residential Gas Rates A and A 1 Exhibit WAP 3 Page 1 of 2 1 Jan 2018 $ 3,168,806 $ 3,168,806 $ 1,584, % $ 2,339 $ 2,339 2 Feb 2018 $ 3,168,806 $ 6,116,230 $ 9,285,036 $ 6,226, % $ 8,053 $ 10,393 3 Mar 2018 $ 9,285,036 $ 4,855,024 $ 14,140,060 $ 11,712, % $ 17,063 $ 27,456 4 Apr 2018 $ 14,140,060 $ 4,612,782 $ 18,752,842 $ 16,446, % $ 25,671 $ 53,127 5 May 2018 $ 18,752,842 $ 2,309,652 $ 21,062,494 $ 19,907, % $ 33,738 $ 86,865 6 Jun 2018 $ 21,062,494 $ 874,755 $ 21,937,249 $ 21,499, % $ 36,113 $ 122,978 7 Jul 2018 $ 21,937, % $ 40,401 $ 163,379 8 Aug 2018 $ 21,937, % $ 41,953 $ 205,331 9 Sep 2018 $ 21,937, % $ 42,101 $ 247, Oct 2018 $ 21,937, % $ 45,057 $ 292, Nov 2018 $ 21,937, % $ 45,105 $ 337, Dec 2018 $ 21,937,249 $ (21,937,249) $ $ 10,968, % $ 24,080 $ 361, Jan % % 14 Feb % % 15 Mar % % 16 Apr % % 17 May % % 18 Jun % % 19 Jul % % 20 Aug % % 21 Sep % % 22 Oct % % 23 Nov % % 24 Dec % %

6 Credit B Interest Expense Calculation Overall Rate of Return One Month Refund From Residential Gas Rates A and A 1 Exhibit WAP 3 Page 2 of 2 1 Jan 2018 $ 3,168,806 $ 3,168,806 $ 1,584, % $ 8,034 $ 8,034 2 Feb 2018 $ 3,168,806 $ 6,116,230 $ 9,285,036 $ 6,226, % $ 28,518 $ 36,551 3 Mar 2018 $ 9,285,036 $ 4,855,024 $ 14,140,060 $ 11,712, % $ 59,387 $ 95,939 4 Apr 2018 $ 14,140,060 $ 4,612,782 $ 18,752,842 $ 16,446, % $ 80,700 $ 176,639 5 May 2018 $ 18,752,842 $ 2,309,652 $ 21,062,494 $ 19,907, % $ 100,940 $ 277,579 6 Jun 2018 $ 21,062,494 $ 874,755 $ 21,937,249 $ 21,499, % $ 105,497 $ 383,076 7 Jul 2018 $ 21,937, % $ 111,231 $ 494,306 8 Aug 2018 $ 21,937, % $ 111,231 $ 605,537 9 Sep 2018 $ 21,937, % $ 107,643 $ 713, Oct 2018 $ 21,937, % $ 111,231 $ 824, Nov 2018 $ 21,937, % $ 107,643 $ 932, Dec 2018 $ 21,937,249 $ (21,937,249) $ $ 10,968, % $ 55,615 $ 987, Jan % % 14 Feb % % 15 Mar % % 16 Apr % % 17 May % % 18 Jun % % 19 Jul % % 20 Aug % % 21 Sep % % 22 Oct % % 23 Nov % % 24 Dec % %

7 IRM Interest Expense Calculation Short Term Interest Rate One Month Refund For Residential Gas Rates A and A 1 Exhibit WAP 4 Page 1 of 2 1 Jan 2018 $ 115,253 $ 115,253 $ 57, % $ 85 $ 85 2 Feb 2018 $ 115,253 $ 116,204 $ 231,457 $ 173, % $ 224 $ Mar 2018 $ 231,457 $ 114,942 $ 346,399 $ 288, % $ 421 $ Apr 2018 $ 346,399 $ 114,305 $ 460,704 $ 403, % $ 630 $ 1,360 5 May 2018 $ 460,704 $ 114,644 $ 575,348 $ 518, % $ 878 $ 2,238 6 Jun 2018 $ 575,348 $ 114,342 $ 689,690 $ 632, % $ 1,062 $ 3,300 7 Jul 2018 $ 689, % $ 1,270 $ 4,571 8 Aug 2018 $ 689, % $ 1,319 $ 5,890 9 Sep 2018 $ 689, % $ 1,324 $ 7, Oct 2018 $ 689, % $ 1,417 $ 8, Nov 2018 $ 689, % $ 1,418 $ 10, Dec 2018 $ 689,690 $ (689,690) $ $ 344, % $ 757 $ 10, Jan % % 14 Feb % % 15 Mar % % 16 Apr % % 17 May % % 18 Jun % % 19 Jul % % 20 Aug % % 21 Sep % % 22 Ocy % % 23 Nov % % 24 Dec % %

8 IRM Interest Expense Calculation Overall Rate of Return Six Month Refujnd From Residential Gas Rates A and A 1 Exhibit WAP 4 Page 2 of 2 1 Jan 2018 $ 115,253 $ 115,253 $ 57, % $ 292 $ Feb 2018 $ 115,253 $ 116,204 $ 231,457 $ 173, % $ 794 $ 1,086 3 Mar 2018 $ 231,457 $ 114,942 $ 346,399 $ 288, % $ 1,465 $ 2,551 4 Apr 2018 $ 346,399 $ 114,305 $ 460,704 $ 403, % $ 1,980 $ 4,531 5 May 2018 $ 460,704 $ 114,644 $ 575,348 $ 518, % $ 2,627 $ 7,158 6 Jun 2018 $ 575,348 $ 114,342 $ 689,690 $ 632, % $ 3,104 $ 10,262 7 Jul 2018 $ 689, % $ 3,497 $ 13,759 8 Aug 2018 $ 689, % $ 3,497 $ 17,256 9 Sep 2018 $ 689, % $ 3,384 $ 20, Oct 2018 $ 689, % $ 3,497 $ 24, Nov 2018 $ 689, % $ 3,384 $ 27, Dec 2018 $ 689,690 $ (689,690) $ $ 344, % $ 1,749 $ 29, Jan % % 14 Feb % % 15 Mar % % 16 Apr % % 17 May % % 18 Jun % % 19 Jul % % 20 Aug % % 21 Sep % % 22 Ocy % % 23 Nov % % 24 Dec % %

9 Exhibit WAP 5 Page 1 of 1 Consumers Energy Company CREDIT B and CREDIT B IRM SURCHARGES IRM IRM TOTAL IRM REFUND INTEREST IRM RATE PER AMOUNT EXPENSE REFUND CUSTOMERS CUSTOMER 6 month short term interest $ 689,690 $ 14,761 $ 704,451 9,886,684 $ (0.07) 6 month overall rate of return $ 689,690 $ 38,088 $ 727,778 9,886,684 $ (0.07) 1 month short term interest $ 689,690 $ 10,805 $ 700,495 1,647,781 $ (0.43) 1 month overall rate of return $ 689,690 $ 29,269 $ 718,959 1,647,781 $ (0.44) CREDIT B CREDIT B TOTAL CREDIT B REFUND INTEREST CREDIT B RATE AMOUNT EXPENSE REFUND Mcf PER Mcf 6 month short term interest $ 21,937,249 $ 518,890 $ 22,456, ,218,464 $ (0.1724) 6 month overall rate of return $ 21,937,249 $ 1,226,552 $ 23,163, ,218,464 $ (0.1779)

10 STATE OF MICHIGAN BEFORE THE MICHIGAN PUBLIC SERVICE COMMISSION In the matter on the Commission's own motion, to consider changes in the rates of all of the Michigan rate-regulated electric, steam, and natural gas utilities to reflect the effects of the federal Tax Cuts and Jobs Act of 2017: Consumers Energy Company filed an application for determination of natural gas Credit B as described in Order U / Case No. U PROOF OF SERVICE On September 11, 2018, an electronic copy of the Residential Customer Group Exhibits 1-5 (WAP-1 through WAP-5) in corrected order and with corrected exhibit titles was served on the following : Name/Party Administrative Law Judge Hon. Sharon Feldman Consumers Energy Company Bret A. Totoraitis Theresa A. G. Staley Association of Businesses Advocating Tariff Equity Bryan A. Brandenburg Attorney General Bill Schuette Celeste Gill Michigan Public Service Commission Staff Daniel Sonneveldt Emily A. Jefferson Address feldmans@michigan.gov mpscfilings@cmsenergy.com bret.totoraitis@cmsenergy.com theresa.staley@cmsenergy.com bbrandenburg@clarkhill.com gillc1@michigan.gov sonneveldtd@michigan.gov jeffersone1@michigan.gov 1

11 The statements above are true to the best of my knowledge, information and belief. PUBLIC LAW RESOURCE CENTER PLLC Dated: October 8, 2018 Carol A. Dane Public Law Resource Center PLLC University Office Place 333 Albert Avenue, Suite 425 East Lansing, MI Direct Dial: (517)