Minnesota Power. Summary of ARO and Cost to Retire Adjustments to 2017 Test Year Average ARO Asset 64,447,205 Remove from Steam Plant

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1 Volume V - ADJ-RB-1 Dockect No. E015/GR Page 1 of 4 Minnesota Power Summary of ARO and Cost to Retire Adjustments to 2017 Test Year 2017 Average ARO Asset 64,447,205 Remove from Steam Plant ARO Liability(2300) (115,344,084) Deferred Asset (1830) 27,779,664 Total Average (87,564,420) Reverse out of budget to increase rate base Average Decommissioning (10810) Steam 40,090,539 Wind 211,404 Total Average 40,301,943 Add back to increase Accumulated Depreciation Average ARO Accumulated Depreciation (10810) Steam 22,355,931 Wind 1,144,795 Total Average 23,500,726 Exclude from Accumulated Depreciation Enter as negative adjustment ARO Accretion (41199) 1,145,924 Exclude from Amortization/Accretion Expense ARO Depreciation Expense ARO Depreciation Expense (40300) (1,251,630) ARO Depreciation Expense (40310) 1,034,097 Total (217,533) Add back to increase Depreciation Expense Enter as postive adjustment Avg Cost to Retire Reclass Required under FAS 143 (Non Legal ARO) Increase (Decrease) to Accumulated Depreciation Hydro (9,918,745) Transmission 11,244,190 Distribution 26,124,869 General Plant (3,560,160) Total Average 23,890,154

2 Volume V - ADJ-RB-1 Dockect No. E015/GR Page 2 of 4 ARO Asset ARO Liability Expense Accumulated Reserve Depreciation Expense Expense Deferred Asset PP-ARO Decommissioning layer added 3,415,343 (3,415,343) Accretion (5,144,301) 5,144,301 Depreciation (3,516,658) 3,516,658 Deferral of Expense (4,219,278) 3,071,160 (2,884,307) 4,032,424 Reverse Wholesale Decom 673,248 (673,248) Amortization of Deferral YTD Actual/Budget Totals 54,017,540 0 (101,728,287) 0 925,024 (20,625,520) 0 36,821,325 (673,248) 632, ,663, layer added 20,859,330 (20,859,330) Accretion (6,372,264) 6,372,264 Depreciation (5,750,412) 5,750,412 Deferral of Expense (5,226,340) 5,709,605 (4,716,315) 4,233,050 Reverse Wholesale Decom 1,251,630 (1,251,630) Amortization of Deferral Budget 74,876,870 0 (128,959,881) 0 1,145,924 (26,375,932) 0 43,782,560 (1,251,630) 1,034, ,896, Average Balances Avg. Bal. 27,779,664 Depr & Amort Exp ARO Adjust Avg. Bal. 64,447,205 Avg. Bal. (115,344,084) Avg. Bal. (23,500,726) Avg. Bal. 40,301,943 Accretion Expense 1,145,924 Reduce Rate Base Depreciation Expense (1,251,630) (115,344,084) Depreciation Expense ,034,097 27,779,664 Amortization Expense 0 (87,564,420) 928,391 Test Year Adjustment: reverse out of budget Net Increase Rate Base Increase Rate Base Reduce Rate Base Total Impact of ARO on Rate Base 6,315,998 Increase This includes adjustments to plant in-service, accumulated depreciation reserve, deferred asset, and ARO liability Reduce Expense \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments - support\workpapers\rate base Adjustments\ADJ-RB-1b 2017 Adjustment - ARO Adjustments 10-26

3 Volume V - ADJ-RB-1 Dockect No. E015/GR Page 3 of 4 Minnesota Power ARO Budget Begin Bal New Liability New Bal Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Total Accretion End Liability Boswell 1-4 Bottom Ash Pond 5,972, ,943 6,245,538 31,173 31,267 31,360 31,454 31,549 31,643 31,738 31,834 31,929 32,025 32,121 32, ,310 6,625,848 Boswell Common Structure 4,021,917 3,884,586 7,906,503 32,753 32,851 32,950 33,049 33,148 33,247 33,347 33,447 33,547 33,648 33,749 33, ,586 8,306,089 Boswell Old Bottom Ash Pond 6,425,063 1,728,694 8,153,757 24,395 24,468 24,542 24,615 24,689 24,763 24,837 24,912 24,987 25,062 25,137 25, ,619 8,451,376 Boswell Scrubber Pond 15,632, ,168 16,468,951 83,422 83,672 83,923 84,175 84,428 84,681 84,935 85,190 85,445 85,702 85,959 86,217 1,017,748 17,486,699 Boswell Supernate Pond 7,040, ,073 7,721,353 38,900 39,017 39,134 39,251 39,369 39,487 39,605 39,724 39,843 39,963 40,083 40, ,580 8,195,933 Boswell Unit 1 Structures 1,809,320 1,188,689 2,998,009 15,190 15,236 15,281 15,327 15,373 15,419 15,465 15,512 15,558 15,605 15,652 15, ,318 3,183,327 Boswell Unit 2 Structures 1,787,354 1,188,689 2,976,043 14,881 14,926 14,970 15,015 15,060 15,106 15,151 15,196 15,242 15,288 15,334 15, ,548 3,157,591 Boswell Unit 3 Structures 6,539,545 1,515,523 8,055,068 41,122 41,245 41,369 41,493 41,618 41,743 41,868 41,993 42,119 42,246 42,372 42, ,688 8,556,756 Boswell Unit 4 Structures 3,364,097 3,440,788 6,804,885 38,819 38,935 39,052 39,169 39,287 39,405 39,523 39,642 39,760 39,880 39,999 40, ,592 7,278,477 Laskin Old Pond 11,206,072 1,460,058 12,666,130 54,600 54,764 54,928 55,093 55,258 55,424 55,590 55,757 55,924 56,092 56,260 56, ,120 13,332,250 Laskin New Pond 2,768, ,657 3,317,193 11,047 11,080 11,113 11,147 11,180 11,214 11,247 11,281 11,315 11,349 11,383 11, ,773 3,451,966 Laskin Structure 8,292,908-8,292,908 34,408 34,511 34,615 34,719 34,823 34,927 35,032 35,137 35,243 35,348 35,454 35, ,777 8,712,685 Bison 1A & 1B 2,755,335-2,755,335 9,897 9,927 9,956 9,986 10,016 10,046 10,076 10,107 10,137 10,167 10,198 10, ,743 2,876,078 Bison 2 & Bison 3 4,528,818-4,528,818 16,590 16,640 16,690 16,740 16,790 16,840 16,891 16,942 16,992 17,043 17,094 17, ,398 4,731,216 Bison 4 4,639,855-4,639,855 16,017 16,065 16,113 16,162 16,210 16,259 16,307 16,356 16,405 16,455 16,504 16, ,407 4,835,262 Tac. Ridge 787, ,341 2,869 2,878 2,886 2,895 2,904 2,912 2,921 2,930 2,939 2,947 2,956 2,965 35, ,343 Hibbard Structure 2,277,779 2,383,465 4,661,244 16,318 16,367 16,416 16,465 16,515 16,564 16,614 16,664 16,714 16,764 16,814 16, ,079 4,860,323 Tac. Harbor Cramer Ash Sites 1A/1B & 2A/2B 2,510,691-2,510,691 6,529 6,549 6,568 6,588 6,608 6,628 6,647 6,667 6,687 6,707 6,728 6,748 79,654 2,590,345 Taconite Harbor Ash Sites 3A and 3B 958, ,763 1,731 1,736 1,741 1,747 1,752 1,757 1,762 1,768 1,773 1,778 1,784 1,789 21, ,881 Taconite Harbor Structures 8,329,614 1,729,997 10,059,611 31,656 31,751 31,846 31,942 32,038 32,134 32,230 32,327 32,424 32,521 32,619 32, ,203 10,445,814 Total Accretion 101,648,666 20,859, ,507, , , , , , , , , , , , ,814 6,372, ,880,260 Amount allowed in expense - wholesale % 93,928 94,210 94,493 94,776 95,060 95,346 95,632 95,919 96,206 96,495 96,784 97,075 1,145,924 Retail % 428, , , , , , , , , , , ,739 5,226,340 Depreciation Boswell Laskin Bison Tac. Ridge Tac Harbor Tac Harbor Wind Wind Hibbard Ash Ponds Structure ARO Assets 21,076,510 11,102,124 10,451, ,181 1,991,452 2,510,033 6,213,125 54,017,540 Accumulated Depreciation 10,647,546 4,078, ,225 79, ,542 1,742,051 2,383,256 20,414,423 Net Book Value 10,428,964 7,023,937 9,545, ,565 1,412, ,982 3,829,869 33,603,117 New Assets 14,737,153 2,008, ,383,465-1,729,997 20,859,330 Total Assets After Adds 74,876,870 New Net Book Value 25,166,117 9,032,652 9,545, ,565 3,796, ,982 5,559,866 54,462,447 Avg. Monthly Rate 0.82% 1.67% 0.26% 0.31% 0.98% 1.85% 0.79% Monthly Depreciation 206, ,845 24,819 1,840 37,204 14,208 43, ,201 Multiplied by Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Total Depr Boswell 206, , , , , , , , , , , ,362 2,476, ,321 Laskin 150, , , , , , , , , , , ,845 1,810, ,517 Bison Wind 24,819 24,819 24,819 24,819 24,819 24,819 24,819 24,819 24,819 24,819 24,819 24, ,828 53,559 1 Tac. Ridge Wind 1,840 1,840 1,840 1,840 1,840 1,840 1,840 1,840 1,840 1,840 1,840 1,840 22,080 3,971 1 Hibbard 37,204 37,204 37,204 37,204 37,204 37,204 37,204 37,204 37,204 37,204 37,204 37, ,448 80,285 Taconite Harbor - Ash Ponds 14,208 14,208 14,208 14,208 14,208 14,208 14,208 14,208 14,208 14,208 14,208 14, ,496 30,660 2 Taconite Harbor - Structure 43,923 43,923 43,923 43,923 43,923 43,923 43,923 43,923 43,923 43,923 43,923 43, ,076 94,784 2 Total ARO Depreciation 479, , , , , , , , , , , ,201 5,750,412 1,034,097 Amount allowed in expense - wholesale % 86,175 86,175 86,175 86,175 86,175 86,175 86,175 86,175 86,175 86,175 86,175 86,172 1,034,097 Retail % 393, , , , , , , , , , , ,029 4,716,315 57,530 1 Wind 125,444 2 Tac Harbor Assumptions 1) No change to decommissioning cost estimates in ) No change to depreciable lives in ) Changed all decommissioning probabilities to 100% as of 1/1/2017 and changed all layers as needed. 8/31/16 Bal. Sep-Dec 16 12/31/16 Bal. Jan-Dec 17 12/31/17 Bal. Avg. Bal. ARO Accum. Depr. Balance by Location BEC 1 266, BEC 2 280, BEC 3 7,029, BEC 4 1,951, BEC Common 2,365, Total Boswell 10,291, , ,655, ,476,344 13,131, ,893,512 (1.00) Laskin 3,764, , ,281, ,810,140 6,091, ,186,560 Bison & Tac. Ridge Wind 876, , , ,908 1,304, ,144,795 Hibbard 519, , , ,448 1,024, ,766 Taconite Harbor - Ash Ponds & Structure 3,931, , ,125, ,572 4,822, ,474,093 Total Average ARO Accum. Depr. 19,382, ,242, ,625, ,750, ,375, ,500, Enter as negative adjustment Steam 22,355,931 Wind 1,144,795 Total 23,500,726 \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments - support\workpapers\rate base Adjustments\ADJ-RB-1c ARO Model-2017 Bud-Adj By Loc 10/31/2016

4 Volume V - ADJ-RB-1 Dockect No. E015/GR Page 4 of 4 MINNESOTA POWER JUST FOR DECOMMISSIONING ENTRIES Dif.-alloc. To tie to ARO Sherbert Sheet-Not Material Avg. Bal. per ARO Sherbert Sheet Total Decommissioinig By Location: 12/31/16 Bal Decomm. 12/31/17 Bal. Avg. Bal. BEC 1 1,505, ,439 2,224,071 1,864,852 (1,813) 1,863,039 BEC 2 1,484, ,228 2,215,785 1,850,171 (1,798) 1,848,373 BEC 3 9,321,567 1,455,756 10,777,323 10,049,445 (9,768) 10,039,677 BEC 4 9,146,873 1,887,888 11,034,761 10,090,817 (9,809) 10,081,008 BEC Common 2,690, ,573 3,080,490 2,885,704 (2,805) 2,882,899 Total Boswell 24,149,546 5,182,884 29,332,430 26,740,989 (25,993) 26,714,996 Laskin 8,793, ,611 9,597,053 9,195,248 (8,938) 9,186,310 Bison and Tac. Ridge Wind 169,288 84, , ,610 (206) 211,404 Hibbard 350, , , ,944 (439) 451,505 Taconite Harbor-Ash Ponds & Structure 3,397, ,120 4,084,925 3,741,365 (3,637) 3,737,728 Total Decommissioining by Location 36,860,536 6,961,236 43,821,772 40,341,156 (39,213) 40,301,943 Steam 40,090,539 Wind 211,404 Total 40,301,943 \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments - support\workpapers\rate base Adjustments\ADJ-RB-1d 2017 Bud Decom Adj by Loc DECOMM ENTRIES - 100% DECOMM 10/31/2016

5 Minnesota Power Cost to Retire balances: Volume 5 - ADJ-RB-2 Page 1 of 1 COR balances 12/31/2015 9/30/2015 Current Current Balance Prior Qtr Balance Entry 22,072, ,905, ,167, if positive then post as a credit to the 2540 account Wind (242,769.83) Bal. Without Wind 22,315, Wind has ARO shouldn't be in these balances - has been removed in 2016 Run Depr Regulatory Liability Saved Filter Run for the three months of the quarter: Jan-Mar Apr-Jun Jul-Sept Oct-Dec Print a copy of this page from the previous quarter Print a copy of the Depr 1135 report from the previous quarter These are scanned and saved here: \\ims01\softrun\maximo\doclinks\ap\ap_vouchers MP > Select the appropriate year per SFAS No. 143, the portion of Cost to Retire in Accumulated Depreciation on non-legal obligations is rquired to be reclassified to a Regulatory Liability account. 12/31/ /31/2016 Balance Est Entry Est. Balance Hydro (7,668,745.03) (1,500,000.00) (9,168,745.03) Transmission 9,594, ,100, ,694, Distribution 23,724, ,600, ,324, General Plant (3,335,160.00) (150,000.00) (3,485,160.00) Total 22,315, ,050, ,365, /31/ /31/17 Est. Balance Est Entry Est. Balance Hydro (9,168,745.03) (1,500,000.00) (10,668,745.03) Transmission 10,694, ,100, ,794, Distribution 25,324, ,600, ,924, General Plant (3,485,160.00) (150,000.00) (3,635,160.00) Total 23,365, ,050, ,415, COR/ARO RECLASS BY LOCATION: Increase (Decrease) 12/31/15 Bal. Est. 12/31/16 Bal. to Accum. Depr. Hydro (7,668,745.03) (9,168,745.03) 1,500, Transmission 9,594, ,694, (1,100,000.00) Distribution 23,724, ,324, (1,600,000.00) General Plant (3,335,160.00) (3,485,160.00) 150, Total 22,315, ,365, (1,050,000.00) Addition to Accumulated Depreciation Reserve Avg. Cost to Retire COR/ARO RECLASS BY LOCATION: Increase (Decrease) Reclass Required under Est. 12/31/16 Bal. Est. 12/31/17 Bal. to Accum. Depr. FAS143 Hydro (9,168,745.03) (10,668,745.03) 1,500, (9,918,745.03) Transmission 10,694, ,794, (1,100,000.00) 11,244, Distribution 25,324, ,924, (1,600,000.00) 26,124, General Plant (3,485,160.00) (3,635,160.00) 150, (3,560,160.00) Total 23,365, ,415, (1,050,000.00) 23,890, Addition to Accumulated Depreciation Reserve Check 23,890, \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments - support\workpapers\adj-rb-2 AvgCost to RetireReclass-FAS 143 by Loc COR Adjust by Location 10/30/2016

6 Summary BEC 3 Retrofit Projects Project costs went over the limit when project went into service 11/2/2009 Total Project Cost 238,231, Project Costs to be Excluded Expected Depr Exp to be Excluded Project Costs to Date Expected Depr Exp Actual thru June 2016 May ,095, , , Oct ,380, , , Nov , , ,283, Total ,036, , ,487, ,036, , ,487, Jan. Oct ,036, , ,487, Nov Dec ,231, ,172, ,231, , ,487, ,231, ,487, ,231, , ,487, ,231, ,487, ,231, , ,487, ,231, ,487, ,231, , ,743, unrecoverable ,231, ,487, ,231, , ,103, ,042, ,231, ,487, ,231, , ,231, ,487, ,231, , /2 year ,231, ,487, ,231, , , ,231, ,487, ,231, , ,231, ,487, ,231, , ,231, ,487, ,231, , BUDGET AMOUNTS TO BE EXCLUDED ,231, ,487, ,231, , ,231, ,487, ,231, , PLANT IN SERVICE 15,231, ,231, ,487, ,231, , PLANT IN SERVICE 15,231, ,231, ,487, ,231, , AVERAGE PLANT IN SERVICE 15,231, ,231, ,487, ,231, , ,231, ,487, ,231, , Depreciation Expense 610, ,231, ,487, ,231, , ,231, ,487, ,231, , ACCUMULATED DEPRECIATION 4,347, ,231, ,487, ,231, , ACCUMULATED DEPRECIATION 4,958, ,231, ,487, ,231, , AVERAGE ACCUMULATED DEPRECIATION 4,652, ,231, ,487, ,231, , ,231, ,487, ,231, , ,231, ,487, ,231, , ,231, ,487, ,231, , ,231, ,092, ,231, , ,231, ,231, Unrecoverable Amount Allowed Recovery On 223,000, Unrecoverable Check s/b zero \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments support\workpapers\rate base Adjustments\ADJ RB 3 BEC BUD RATE CASE ADJUSTS 10/31/ :11 AM Volume 5 - ADJ-RB-3 Page 1 of 1

7 Volume 5 - ADJ-RB-4 Page 1 of 2 RIDER CWIP & PLANT IN SERVICE RATE CASE ADJUSTS SEE FILE (PATH AT BOTTOM OF THE SHEET) FOR SUPPORT FOR THE #S ON THESE SCHS (Rate Case Rider Adjustments for Accumulated Depreciation and Depreciation Expense were provided separately from the Rates Dept.) Grand Total 12/31/16 Balance 12/31/17 Balance Average Balance CWIP (Excludes Contra Amounts) 40,309, ,938, ,623, Retail Contra (1,615,476.65) (7,366,492.95) (4,490,984.80) FERC Contra (349,906.72) (2,058,880.44) (1,204,393.58) Total CWIP (Including Contra Amounts) 38,343, ,512, ,928, AFDC Debt included in the above 772, ,606, ,689, AFDC Equity included in the above 2,200, ,716, ,958, Plant In Service (Excludes Contra Amounts) 2,914, ,119, ,016, Retail Contra (64,823.09) (673,873.16) (369,348.13) FERC Contra Total Plant In Service (Including Contra Amounts) 2,849, ,445, ,647, AFDC Debt included in the above 16, , , AFDC Equity included in the above 48, , , Steam Summary Transmission Summary 12/31/16 Balance 12/31/17 Balance Average Balance 12/31/16 Balance 12/31/17 Balance Average Balance CWIP (Excludes Contra Amounts) 2,868, ,137, ,002, CWIP (Excludes Contra Amounts) 34,625, ,800, ,213, Retail Contra (117,623.82) (338,479.39) (228,051.61) Retail Contra (1,270,534.88) (6,991,135.31) (4,130,835.10) FERC Contra (25,790.13) (74,214.76) (50,002.45) FERC Contra (360,994.84) (2,021,543.93) (1,191,269.39) Total CWIP (Including Contra Amounts) 2,724, ,724, ,724, Total CWIP (Including Contra Amounts) 32,993, ,788, ,890, Plant In Service (Excludes Contra Amounts) Plant In Service (Excludes Contra Amounts) 569, ,722, ,646, Retail Contra Retail Contra (14,610.00) (160,920.54) (87,765.27) FERC Contra FERC Contra Total Plant In Service (Including Contra Amounts) Total Plant In Service (Including Contra Amounts) 554, ,561, ,558, Hydro Summary Distribution Summary 12/31/16 Balance 12/31/17 Balance Average Balance 12/31/16 Balance 12/31/17 Balance Average Balance CWIP (Excludes Contra Amounts) 2,815, ,407, CWIP (Excludes Contra Amounts) Retail Contra (190,439.70) (95,219.85) Retail Contra FERC Contra FERC Contra Total CWIP (Including Contra Amounts) 2,625, ,312, Total CWIP (Including Contra Amounts) Plant In Service (Excludes Contra Amounts) 7,744, ,872, Plant In Service (Excludes Contra Amounts) 1,779, ,019, ,899, Retail Contra (462,739.53) (231,369.77) Retail Contra (41,847.85) (41,847.85) (41,847.85) FERC Contra FERC Contra Total Plant In Service (Including Contra Amounts) 7,281, ,640, Total Plant In Service (Including Contra Amounts) 1,737, ,977, ,857, Solar Summary General Plant Summary 12/31/16 Balance 12/31/17 Balance Average Balance 12/31/16 Balance 12/31/17 Balance Average Balance CWIP (Excludes Contra Amounts) CWIP (Excludes Contra Amounts) Retail Contra Retail Contra FERC Contra FERC Contra Total CWIP (Including Contra Amounts) Total CWIP (Including Contra Amounts) Plant In Service (Excludes Contra Amounts) 206, , , Plant In Service (Excludes Contra Amounts) 358, , , Retail Contra Retail Contra (8,365.24) (8,365.24) (8,365.24) FERC Contra FERC Contra Total Plant In Service (Including Contra Amounts) 206, , , Total Plant In Service (Including Contra Amounts) 350, , , * No continuing riders for Wind or Intangible Plant \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments support\workpapers\adj RB Adjustment Rider Rate Case Adjusts Detail excl. Contra revised 10/30/2016

8 Volume 5 - ADJ-RB-4 Page 2 of 2 Minnesota Power Summary of Continuing Rider Project Depreciation and Accumulated Depreciation Adjustments to Test Year Total Avg Dec-16 Jan-17 Feb-17 Mar-17 Apr-17 May-17 Jun-17 Jul-17 Aug-17 Sep-17 Oct-17 Nov-17 Dec Renewable Resources Rider Thomson Projects Total Accumulated Depreciation 5,656 2,828 Depreciation Expense 5,656 5,656 Camp Ripley Projects Total Accumulated Depreciation 2,134 6,403 10,672 14,941 19,209 23,478 27,747 32,016 36,284 40,553 44,822 49,091 53,360 27,747 Depreciation Expense 2,134 4,269 4,269 4,269 4,269 4,269 4,269 4,269 4,269 4,269 4,269 4,269 4,269 51,225 Cummunity Solar Garden Project Total Accumulated Depreciation 1,720 2,408 3,097 3,785 4,473 5,161 5,849 6,537 7,225 7,914 8,602 9,290 9,978 5,849 Depreciation Expense ,258 Total Renewable Resources Rider Total Accumulated Depreciation 3,855 8,812 13,769 18,725 23,682 28,639 33,596 38,553 43,510 48,467 53,424 58,381 68,994 36,424 Depreciation Expense 2,823 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 10,613 65,139 Transmission Cost Recovery Rider Total Accumulated Depreciation 2,101 6,304 11,930 5,965 Depreciation Expense 3,101 4,203 5,626 12,930 Total Depreciation Adjustments Total Accumulated Depreciation 3,855 8,812 13,769 18,725 23,682 28,639 33,596 38,553 43,510 48,467 55,525 64,685 80,924 42,389 Depreciation Expense 2,823 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 4,957 8,058 9,160 16,239 78,069

9 Volume 5 - ADJ-RB-5 Page 1 of 1 Aircraft and Aircraft Hanger 2017 BUDGET AMOUNTS TO BE EXCLUDED Plant In Service Accum Depr 2017 Depr Exp Est. 12/31/2016 4,562, ,196, Est. 12/31/2017 4,562, ,243, , Average Bal. 4,562, ,219, \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments support\workpapers\adj RB 5 Aircraft&Hangar Rate Case Adj Summary 10/30/2016 4:19 PM

10 MINNESOTA POWER PRODUCTION PLANT COMPARISON OF PRESENT AND PROPOSED REMAINING LIVES Budget Proposed Rates, Proposed Lives, and 2017 Proposed Rates, BEC lives extended to Decrease in 2017 Estimated Estimated 100% Decomm. Probabilities 2050, and 100% Decomm. Probabilities Depr Expense Depreciable Depreciation Remaining Salvage 2017 Remaining Salvage 2017 & Accum Depr Plant Balance Reserve Life Value Annual Life Value Annual & Increase in 12/31/16 12/31/16 (01/01/17) (01/01/17) Accrual (01/01/17) (01/01/17) Accrual Depreciable Basis Boswell Energy Center: 1,357,038, ,528,973 56,381,038 27,804,433 (28,576,605) Unit No. 1 45,902,029 29,611, % 2,942, % 692,452 (2,250,468) Unit No. 2 41,645,460 27,543, % 2,679, % 630,461 (2,048,998) Unit No ,127, ,615, % 18,112, % 9,588,793 (8,523,372) Unit No ,443, ,597, % 24,991, % 13,965,772 (11,025,609) Common 197,920, ,162, % 7,655, % 2,926,955 (4,728,158) The BEC4 Rate Case Adjustment would decrease 2017 Budget Depreciation Expense and 2017 Budget Accumulated Depreciation at 12/31/17 by the above amounts Accumulated Depreciation Accumulated Depreciation (28,576,605) Average Accumulated Depreciation (14,288,303) Volume 5 - ADJ-RB-6 Page 1 of Depreciation Expense (28,576,605) \\users\~sshimmin$\private\2016 Retail Rate Case\Inputs to COS\2017 Adjustments - support\workpapers\adj-rb Adjustment - 100PercDecom & BECLifeExt Depr Impact SteamCompLives All BEC Life Ext 10/30/2016

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20 Volume V - ADJ-RB-10 Dockect No. E015/GR Page 1 of 1

In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, Docket No.

In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Adjustments to Rate Base ADJ RB 1 ADJ RB 2 ADJ RB 3 ADJ RB