VOLUME I. Notice of Change in Rates Proposed Notices to Counties and Municipalities. Transmittal Letter. Index

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1 In the Matter of the Application of Minnesota Power for Authority to Increase Rates for Electric Utility Service in Minnesota VOLUME I Notice of Change in Rates Proposed Notices to Counties and Municipalities Transmittal Letter Index Statement Regarding Trade Secret Information Summary of Filing Notice of Change in Rates Completeness Checklist Proposed Notice to Counties and Municipalities Proposed Newspaper Publication List of Counties and Cities Certificate of Service Service List

2 In the Matter of the Application of Minnesota Power for Authority to Increase Rates for Electric Utility Service in Minnesota VOLUME II Petition for Interim Rates Supporting Schedules Tariff Pages Proposed Notices to Customers Index Notice & Petition for Interim Rates Schedule A (IR) Summary of Jurisdictional Revenue Deficiency, Rate Base and Operating Income Summary of Revenue Deficiency Summary of Rate Base (MN Jurisdiction and Total Company) A-1 (IR) A-2 (IR) Summary of Operating Income (MN Jurisdictional and Total Company) A-3 (IR) Operating Income Detail (MN Jurisdictional and Total Company) Summary of Adjustments to Rate Base for Test Year Summary of Adjustments to Operating Income for Test Year Description and Basis for Elements of Projected Rate Base and Operating Income Comparison of Interim and General Rates (Total Company) A-4 (IR) A-5 (IR) A-6 (IR) A-7 (IR) A-8 (IR) Schedule B (IR) Jurisdictional Cost of Service Studies (Comparison of Changes in Rate Base and Operating Income Docket No. E015/GR , Actual 2015, Projected 2016, and Test Year Interim Rates) Comparison of Changes in Jurisdictional Rate Base and Operating Income Comparison of Changes in Total Company Rate Base and Operating Income Description of Changes in Rate Base B-1 (IR) B-2 (IR) B-3 (IR)

3 Description of Changes in Operating Income Comparison of Changes in Jurisdictional Allocation Factors B-4 (IR) B-5 (IR) Schedule C (IR) Retail Class Cost Allocation, Test Year (Jurisdictional Cost of Service Studies) Test Year Interim Rate Cost of Service Projected 2016 Cost of Service Actual 2015 Cost of Service Final Ordered Cost of Service in Docket No. E015/GR C-1 (IR) C-2 (IR) C-3 (IR) C-4 (IR) Schedule D (IR) Rate of Return/Cost of Capital Rate of Return/Cost of Capital Summary Comparison of Capital Structure/Rate of Return Docket No. E015/GR and Interim Rates D-1 (IR) D-2 (IR) Schedule E (IR) Comparison of Revenue Comparison of Revenues Under Present and Proposed Interim Rates by Rate Class (Residential, General Service, LL&P, LP, Municipal Pumping, Lighting, Dual Fuel, etc.) Sales Forecast, Revenue, Cost of Service, and Rate Design Data Links E-1 (IR) E-2 (IR) Schedule F (IR) Annual Report See Volume IV, General Rates, Schedule F Schedule G (IR) Miscellaneous Advertising Expense Charitable Contributions Organization Dues Research Expense Economic and Community Development G-1 (IR) G-2 (IR) G-3 (IR) G-4 (IR) G-5 (IR) ii

4 Determination of Working Capital Requirements Development of Gross Revenue Conversion Factor Calculation of Conservation Cost Recovery Charge Summary of Rate Sheets Not Changed G-6 (IR) G-7 (IR) G-8 (IR) G-9 (IR) Schedule H (IR) Tax Summary of Federal and State Income Taxes Computation of Federal and State Income Taxes H-1 (IR) 11-2 (IR) Schedule I (IR) Employee Expenses See Volume IV, General Rates, Schedule I Interim Rate Tariff Pages Redlined and Clean Agreement and Undertaking Certification Proposed Notices to Customers iii

5 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, VOLUME III Direct Testimony in Support of Change in Rates David J. McMillan Rate Case Overview Patrick L. Cutshall Capital Structure, Cost of Capital, and Retirement Plan Accounting Robert B. Hevert Return on Equity Herbert G Minke, III Regulatory Accounting Steven W. Morris Budgeting, Cost Allocations, and Expenses Joshua J. Skelton Generation Christopher E. Fleege Transmission & Distribution Nicole R. Johnson Employee Compensation and Benefits Julie I. Pierce Sales Forecast and Asset-Based Wholesale Energy Margins Michael A. Perala Large Power Customer Demand and Forecasting Leann S. Oehlerking-Boes Fuel Clause Adjustment Jamie L. Jago Tax Matters Stewart J. Shimmin Jurisdictional Costs and Class Cost of Service Study Tina S. Koecher Customer Solutions Marcia A. Podratz Revenue Requirements, Rate Design, and Annual Rate Review Mechanism

6 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, Volume IV Information Requirements Schedule A Summary of Jurisdictional Revenue Deficiency, Rate Base and Operating Income Summary of Revenue Deficiency A-1 Summary of Rate Base for Actual, Projected and Test Year A-2 Summary of Operating Income for Actual, Projected and Test Year A-3 Comparison of Changes to Operating Income for Last Actual Fiscal Year, Projected Year, & Test Year A-4 Summary of Adjustments Rate Base for Test Year A-5 Summary of Adjustments to Operating Income for Test Year A-6 Description & Basis for Elements of Projected Rate Base & Operating Income A-7 Schedule B Jurisdictional Cost of Service Studies Test Year General Rate Cost of Service B-1 Projected 2016 Cost of Service B-2 Actual 2015 Cost of Service B-3 Comparison of Changes in Jurisdictional Allocation Factors B-4

7 Comparison of Changes in Jurisdictional Rate Base and Operating Income B-5 Comparison of Changes in Total Company Rate Base and Operating Income B-6 Schedule C Retail Class Cost Allocation, Test Year 2017 Cost of Service Study, including Summary of Rate Base & Income at Present & Proposed Rates by Retail Rate Class C-1 Schedule D Rate of Return/Cost of Service Rate of Return/Cost of Capital Summary D-1 Embedded Cost of Long-Term Debt D-2 Schedule E Comparison of Revenue Comparison of Revenues under Present & Proposed General Rates by Rate Class (Residential, General Service, LL&P, LP, Municipal Pumping, Lighting, Dual Fuel, etc.) E-1 Sales Forecast, Revenue, Cost of Service & Rate Design Date Links E-2 Schedule F Annual Report Schedule G Miscellaneous Advertising Expense G-1 Charitable Contributions G-2 Organization Dues G-3 Research Expense G-4

8 Economic & Community Development G-5 Determination of Working Capital Requirements G-6 Development of Gross Revenue Conversion Factor G-7 Calculation of Conservation Cost Recovery Charge G-8 Summary of Rate Sheets Not Changed & Rate Sheets Cancelled G-9 Schedule H Tax Summary of Federal and State Income Taxes H-1 Computation of Federal and State Income Taxes 11-2 Schedule I Employee Expenses Tariff Pages for Change in Rates Redlined Cleaned

9 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 4 ADJ RB 5 ADJ RB 6 ADJ RB 7 ADJ RB 8 ADJ RB 9 ADJ RB 10 Asset Retirement Obligation Cost to Retire ARO Reclass Boswell 3 Environmental Project Continuing Cost Recovery Riders Aircraft and Hanger Boswell Life Extension OPEB Exclude Prepaid Pension Cash Working Capital O&M Adjustments Prorata ADIT Adjustments to Income Statement ADJ IS 1 Asset Retirement Obligation (ARO) ADJ IS 2 Boswell 3 Environment Project Adjustment ADJ IS 3 Remove Total Rider Revenue Budgets ADJ IS 4 Add Total Rider Revenue Cash ADJ IS 5 Continuing Cost Recovery Riders ADJ IS 6 Aircraft Expense ADJ IS 7 Boswell Life Extension ADJ IS 8 AIP Above 20% Base Comp ADJ IS 9 100% LTICP ADJ IS-10 SERP ADJ IS 11 To Match CIP budget with Trennial Filing ADJ IS 12 50% Economic Development ADJ IS 13 Charitable Contributions 50% Allowed & MPUC Policy Statement Page 1 of 7

10 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Continued ADJ IS 14 Advertising Expense Adjustment: MPUC Policy Statement, and Sample Advertisement ADJ IS 15 Organizational Dues Adjustment: MPUC Policy Statement and Adjustment ADJ IS 16 Board of Directors Expenses ADJ IS 17 Employee Expense Removed ADJ IS 18 Lobbying Expense Deducted ADJ IS 19 Investor Relations 50% ADJ IS 20 Net 2010 & 2017 Rate Case Expense Credit & Amortization ADJ IS 21 Duluth Ordinance Assessment (DOA) ADJ IS 22 Reverse CIP Adjustment ADJ IS 23 Total CIP ADJ IS 24 CCRC Adjustment ADJ IS 25 CARE Adjustment ADJ IS 26 FAC Budget with Lag ADJ IS 27 FAC Base Cost Per kwh (no Lag) ADJ IS 28 LP Contract Normalization ADJ IS 29 Remove Def Rate Case Expense ADJ IS 30 Budget Corrections ADJ IS 31 Misc Revenue Adjusts Budget to E-Schedule General Only Adjustments ADJ IS 32 ADJ IS 33 ADJ IS 34 ADJ IS 35 Cloquet Energy Center TG5 Amortization Medicare Part D Amortization Rider Internal Cost Recover in O&M Amortization of Deferred Storm Cost Page 2 of 7

11 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Continued Rate Base RB 1 RB 2 RB 3 RB 4 RB 5 RB 6 RB 7 RB 8 RB 9 RB 10 RB 11 RB 12 RB 13 RB 14 RB 15 RB 16 RB 17 RB 18 RB 19 RB 20 RB 21 RB 22 RB 23 RB 24 RB Capital Expenditures 2017 Cost of Plant 2017 CWIP 2017 Accumulated Depreciation and Amortization 2017 Working Capital 2017 Workers Comp Deposit 2017 Unamort WPPI Transm Amort 2017 Unamort UMWI Transaction Cost 2017 Customer Advances 2017 Customer Deposits 2017 Other Deferred Credits Hibbard 2017 Wind Performance Deposit 2017 Accumulated Deferred Income Tax 2017 AFUDC Rate 2016 Cost of Plant 2016 CWIP 2016 Accumulated Depreciation and Amortization 2016 Working Capital 2016 Workers Comp Deposit 2016 Unamort WPPI Transm Amort 2016 Unamort UMWI Transaction Cost 2016 Customer Advances 2016 Customer Deposits 2016 Other Deferred Credits Hibbard 2016 Wind Performance Deposit Page 3 of 7

12 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, Docket No. E015/GR INDEX - VOLUME V Workpapers Continued RB 26 RB 27 RB 28 RB 29 RB 30 RB 31 RB 32 RB 33 RB 34 RB 35 RB 36 RB 37 RB 38 RB 39 RB Accumulated Deferred Income Tax 2016 AFUDC Rate 2015 Cost of Plant 2015 CWIP 2015 Accumulated Depreciation and Amortization 2015 Working Capital 2015 Workers Comp Deposit 2015 Unamort WPPI Transm Amort 2015 Unamort UMWI Transaction Cost 2015 Customer Advances 2015 Customer Deposits 2015 Other Deferred Credits Hibbard 2015 Wind Performance Deposit 2015 Accumulated Deferred Income Tax 2015 AFUDC Rate Income Statement IS 1 IS 2 IS 2A IS 3 IS 4 IS 5 IS 6 IS 7 IS 8 IS Operating Revenues Unadjusted 2107 Test Year O&M General Rates 2017 Test Year O&M Interim Rates 2017 Labor Only O&M 2017 Depreciation Expense Unadjusted 2017 Amortization Expense Unadjusted 2017 Property Taxes Unadjusted 2017 Payroll Taxes Unadjusted 2017 Environmental Taxes Unadjusted 2017 Income Taxes, ITC and AFUDC Unadjusted Page 4 of 7

13 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Continued IS 10 IS 11 IS 12 IS 13 IS 14 IS 15 IS 16 IS 17 IS 18 IS 19 IS 20 IS 21 IS 22 IS 23 IS 24 IS 25 IS 26 IS 27 IS Operating Revenues Projected 2016 O&M Projected 2016 Labor Only O&M Projected 2016 Depreciation Expense Projected 2016 Amortization Expense Projected 2016 Property Taxes Projected 2016 Payroll Taxes Projected 2016 Environmental Taxes Projected 2016 Income Taxes, ITC and AFUDC Projected 2015 Operating Revenues Actual 2015 O&M Actual 2015 Labor Only O&M Actual 2015 Depreciation Expense Actual 2015 Amortization Expense Actual 2015 Property Taxes Actual 2015 Payroll Taxes Actual 2015 Environmental Taxes Actual 2015 Income Taxes, ITC and AFUDC Actual Research Expense MPUC Policy Statement Cost of Capital PLC 1 Minnesota Power Capital Structure Determination PLC 2 S&P Global Ratings for ALLETE 2016 PLC 3 S&P Corporate Methodology PLC 4 Moody's Ratings for ALLETE 2016 PLC 5 Moody's Rating Methodology Page 5 of 7

14 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Continued Cost of Service COS 1 COS 2 COS 3 COS 4 COS 5 COS COSS Per Budget (Peak & Average) 2017 COSS 1CP 2017 COSS 12CP 2017 COSS 3Winter MISO CP 2017 COSS 3Summer MISO CP 2017 COSS 3Winter and Summer MISO CP COS Reconciliation RECON-1 RECON-2 RECON-3 RECON-4 RECON-5 RECON FERC Income Statement to COSS per Budget and Workpapers 2016 FERC Income Statement to COSS and Workpapers 2015 GAAP General Ledger to FERC Balance Sheet 2015 GAAP General Ledger to FERC Income Statement 2015 FERC Balance Sheet to COSS and Workpapers 2015 FERC Income Statement COSS and Workpapers Allocation Factors AF 1 AF 2 AF 3 AF 4 AF 5 AF 6 AF Jurisdictional Demand and Energy Allocation Factors 2016 Jurisdictional Demand and Energy Allocation Factors 2015 Jurisdictional Demand and Energy Allocation Factors 2017 D-01 & D-02 Single CP Demand Allocation 2017 D-01 & D month CP Demand Allocation 2017 D-01 & D-02 3 Winter MISO CP Demand Allocation 2017 D-01 & D-02 3 Summer MISO CP Demand Allocation Page 6 of 7

15 In the Matter of the Application of Minnesota Power for Authority to Increase Electric Service Rates in Minnesota, INDEX - VOLUME V Workpapers Continued AF 8 AF 9 AF 10 AF D-01 & D-02 3 Summer and Winter MISO CP Demand Allocation 2017 Jurisdictional & Class Customer Allocation 2016 Jurisdictional & Class Customer Allocation 2015 Jurisdictional & Class Customer Allocation Fuel Clause FC Average Fuel and Purchased Energy Cost Rate Design RD 1 RD 2 RD 3 RD Voltage Discount Cost Support Service Extension Cost Grid Project 2017 Lighting Cost Study Other Distribution Plant Study 0 2 Hevert Workpapers Page 7 of 7

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