0000001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 0000002 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 0000003 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 0000004 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000005 - Statement - Condensed Consolidated Balance Sheets (unaudited) link:presentationLink link:calculationLink link:definitionLink 0000006 - Statement - Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000007 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 0000008 - Statement - Condensed Consolidated Statements of Equity (unaudited) link:presentationLink link:calculationLink link:definitionLink 0000009 - Statement - Condensed Consolidated Statements of Equity (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 0000010 - Disclosure - Management's Statement: link:presentationLink link:calculationLink link:definitionLink 0000011 - Disclosure - Regulatory Matters: link:presentationLink link:calculationLink link:definitionLink 0000012 - Disclosure - Commitments, Contingencies and Guarantees: link:presentationLink link:calculationLink link:definitionLink 0000013 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 0000014 - Disclosure - Financing: link:presentationLink link:calculationLink link:definitionLink 0000015 - Disclosure - Earnings Per Share: link:presentationLink link:calculationLink link:definitionLink 0000016 - Disclosure - Risk Management and Derivatives: link:presentationLink link:calculationLink link:definitionLink 0000017 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 0000018 - Disclosure - Other Comprehensive Income: link:presentationLink link:calculationLink link:definitionLink 0000019 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 0000020 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 0000021 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 0000022 - Disclosure - Selected Balance Sheet Information: link:presentationLink link:calculationLink link:definitionLink 0000023 - Disclosure - Subsequent Events: link:presentationLink link:calculationLink link:definitionLink 0000024 - Disclosure - Management's Statement (Policies) link:presentationLink link:calculationLink link:definitionLink 0000025 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 0000026 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 0000027 - Disclosure - Financing (Tables) link:presentationLink link:calculationLink link:definitionLink 0000028 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 0000029 - Disclosure - Risk Management and Derivatives: (Tables) link:presentationLink link:calculationLink link:definitionLink 0000030 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 0000031 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:calculationLink link:definitionLink 0000032 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 0000033 - Disclosure - Business Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 0000034 - Disclosure - Selected Balance Sheet Information (Tables) link:presentationLink link:calculationLink link:definitionLink 0000035 - Disclosure - Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 0000036 - Disclosure - Regulatory Matters: Winter Storm Uri (Details) link:presentationLink link:calculationLink link:definitionLink 0000037 - Disclosure - Regulatory Matters: Tax Cut and Jobs Act (Details) link:presentationLink link:calculationLink link:definitionLink 0000038 - Disclosure - Regulatory Matters: Rate Review (Details) link:presentationLink link:calculationLink link:definitionLink 0000039 - Disclosure - Commitments, Contingencies and Guarantees: Agreement under Blockchain Interruptible Service Tariff (Details) link:presentationLink link:calculationLink link:definitionLink 0000040 - Disclosure - Commitments, Contingencies and Guarantees: Power Sales Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 0000041 - Disclosure - Commitments, Contingencies and Guarantees: GT Resources, LLC v Black Hills Corp (Details) link:presentationLink link:calculationLink link:definitionLink 0000042 - Disclosure - Commitments, Contingencies and Guarantees: Power Purchase Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 0000043 - Disclosure - Commitments, Contingencies and Guarantees: Transmission Service Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 0000044 - Disclosure - Revenue: Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 0000045 - Disclosure - Financing: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 0000046 - Disclosure - Financing: Revolving Credit Facility and CP Program (Details) link:presentationLink link:calculationLink link:definitionLink 0000047 - Disclosure - Financing: Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 0000048 - Disclosure - Financing: Equity (Details) link:presentationLink link:calculationLink link:definitionLink 0000049 - Disclosure - Earnings Per Share: Earnings Per Share Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 0000050 - Disclosure - Earnings Per Share: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 0000051 - Disclosure - Risk Management and Derivatives: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 0000052 - Disclosure - Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) link:presentationLink link:calculationLink link:definitionLink 0000053 - Disclosure - Risk Management and Derivatives: Derivatives Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 0000054 - Disclosure - Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 0000055 - Disclosure - Fair Value Measurements: Schedule of Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 0000056 - Disclosure - Fair Value Measurements: Other Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 0000057 - Disclosure - Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 0000058 - Disclosure - Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 0000059 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 0000060 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 0000061 - Disclosure - Business Segment Information: (Details) link:presentationLink link:calculationLink link:definitionLink 0000062 - Disclosure - Business Segment Information: Segment and Corporate Assets (Details) link:presentationLink link:calculationLink link:definitionLink 0000063 - Disclosure - Business Segment Information: Information Relating to Segment Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 0000064 - Disclosure - Selected Balance Sheet Information: Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 0000065 - Disclosure - Selected Balance Sheet Information: Changes to Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 0000066 - Disclosure - Selected Balance Sheet Information: Materials and Supplies (Details) link:presentationLink link:calculationLink link:definitionLink 0000067 - Disclosure - Selected Balance Sheet Information: Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink