0001001 - Document - Cover Page link:presentationLink link:calculationLink link:definitionLink 1001002 - Statement - Condensed Consolidated Statements of Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1002003 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) link:presentationLink link:calculationLink link:definitionLink 1003004 - Statement - Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1004005 - Statement - Condensed Consolidated Balance Sheets (unaudited) link:presentationLink link:calculationLink link:definitionLink 1005006 - Statement - Condensed Consolidated Balance Sheets (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1006007 - Statement - Condensed Consolidated Statements of Cash Flows (unaudited) link:presentationLink link:calculationLink link:definitionLink 1007008 - Statement - Condensed Consolidated Statements of Equity (unaudited) link:presentationLink link:calculationLink link:definitionLink 1008009 - Statement - Condensed Consolidated Statements of Equity (unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 2101101 - Disclosure - Management's Statements: link:presentationLink link:calculationLink link:definitionLink 2202201 - Disclosure - Management's Statement (Policies) link:presentationLink link:calculationLink link:definitionLink 2103102 - Disclosure - Regulatory Matters: link:presentationLink link:calculationLink link:definitionLink 2304301 - Disclosure - Regulatory Matters (Tables) link:presentationLink link:calculationLink link:definitionLink 2405401 - Disclosure - Regulatory Matters (Details) link:presentationLink link:calculationLink link:definitionLink 2406402 - Disclosure - Regulatory Matters: Winter Storm Uri (Details) link:presentationLink link:calculationLink link:definitionLink 2407403 - Disclosure - Regulatory Matters: Tax Cut and Jobs Act (Details) link:presentationLink link:calculationLink link:definitionLink 2408404 - Disclosure - Regulatory Matters: Rate Review (Details) link:presentationLink link:calculationLink link:definitionLink 2109103 - Disclosure - Commitments, Contingencies and Guarantees: link:presentationLink link:calculationLink link:definitionLink 2410405 - Disclosure - Commitments, Contingencies and Guarantees: Power Sales Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2411406 - Disclosure - Commitments, Contingencies and Guarantees: GT Resources, LLC v Black Hills Corp (Details) link:presentationLink link:calculationLink link:definitionLink 2412407 - Disclosure - Commitments, Contingencies and Guarantees: Power Purchase Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2413408 - Disclosure - Commitments, Contingencies and Guarantees - Transmission Service Agreements (Details) link:presentationLink link:calculationLink link:definitionLink 2114104 - Disclosure - Revenue: link:presentationLink link:calculationLink link:definitionLink 2315302 - Disclosure - Revenue (Tables) link:presentationLink link:calculationLink link:definitionLink 2416409 - Disclosure - Revenue: Disaggregation of Revenue (Details) link:presentationLink link:calculationLink link:definitionLink 2117105 - Disclosure - Financing: link:presentationLink link:calculationLink link:definitionLink 2318303 - Disclosure - Financing (Tables) link:presentationLink link:calculationLink link:definitionLink 2419410 - Disclosure - Financing: Schedule of Short-term Debt and Narrative (Details) link:presentationLink link:calculationLink link:definitionLink 2420411 - Disclosure - Financing: Revolving Credit Facility and CP Program (Details) link:presentationLink link:calculationLink link:definitionLink 2421412 - Disclosure - Financing: Debt Covenants (Details) link:presentationLink link:calculationLink link:definitionLink 2422413 - Disclosure - Financing: Equity (Details) link:presentationLink link:calculationLink link:definitionLink 2123106 - Disclosure - Earnings Per Share: link:presentationLink link:calculationLink link:definitionLink 2324304 - Disclosure - Earnings Per Share (Tables) link:presentationLink link:calculationLink link:definitionLink 2425414 - Disclosure - Earnings Per Share: Earnings Per Share Reconciliation (Details) link:presentationLink link:calculationLink link:definitionLink 2426415 - Disclosure - Earnings Per Share: Anti-dilutive shares (Details) link:presentationLink link:calculationLink link:definitionLink 2127107 - Disclosure - Risk Management and Derivatives: link:presentationLink link:calculationLink link:definitionLink 2328305 - Disclosure - Risk Management and Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 2429416 - Disclosure - Risk Management and Derivatives: Utilities (Details) link:presentationLink link:calculationLink link:definitionLink 2430417 - Disclosure - Risk Management and Derivatives: Derivatives by Balance Sheet Classification (Details) link:presentationLink link:calculationLink link:definitionLink 2431418 - Disclosure - Risk Management and Derivatives: Cash Flow Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 2432419 - Disclosure - Risk Management and Derivatives: Derivatives Not Designated as Hedge Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 2133108 - Disclosure - Fair Value Measurements: link:presentationLink link:calculationLink link:definitionLink 2334306 - Disclosure - Fair Value Measurements (Tables) link:presentationLink link:calculationLink link:definitionLink 2435420 - Disclosure - Fair Value Measurements: Schedule of Fair Values (Details) link:presentationLink link:calculationLink link:definitionLink 2436421 - Disclosure - Fair Value Measurements: Other Fair Value Measurements (Details) link:presentationLink link:calculationLink link:definitionLink 2137109 - Disclosure - Other Comprehensive Income: link:presentationLink link:calculationLink link:definitionLink 2338307 - Disclosure - Other Comprehensive Income (Tables) link:presentationLink link:calculationLink link:definitionLink 2439422 - Disclosure - Other Comprehensive Income: Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) link:presentationLink link:calculationLink link:definitionLink 2440423 - Disclosure - Other Comprehensive Income: Accumulated Other Comprehensive Income (Details) link:presentationLink link:calculationLink link:definitionLink 2141110 - Disclosure - Employee Benefit Plans: link:presentationLink link:calculationLink link:definitionLink 2342308 - Disclosure - Employee Benefit Plans (Tables) link:presentationLink link:calculationLink link:definitionLink 2443424 - Disclosure - Employee Benefit Plans (Details) link:presentationLink link:calculationLink link:definitionLink 2144111 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2445425 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 2146112 - Disclosure - Business Segment Information: link:presentationLink link:calculationLink link:definitionLink 2347309 - Disclosure - Business Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2448426 - Disclosure - Business Segment Information: (Details) link:presentationLink link:calculationLink link:definitionLink 2449427 - Disclosure - Business Segment Information: Segment and Corporate Assets (Details) link:presentationLink link:calculationLink link:definitionLink 2450428 - Disclosure - Business Segment Information: Information Relating to Segment Statement of Income (Details) link:presentationLink link:calculationLink link:definitionLink 2151113 - Disclosure - Selected Balance Sheet Information: link:presentationLink link:calculationLink link:definitionLink 2352310 - Disclosure - Selected Balance Sheet Information (Tables) link:presentationLink link:calculationLink link:definitionLink 2453429 - Disclosure - Selected Balance Sheet Information: Accounts Receivable (Details) link:presentationLink link:calculationLink link:definitionLink 2454430 - Disclosure - Selected Balance Sheet Information: Changes to Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 2455431 - Disclosure - Selected Balance Sheet Information: Materials and Supplies (Details) link:presentationLink link:calculationLink link:definitionLink 2456432 - Disclosure - Selected Balance Sheet Information: Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 2157114 - Disclosure - Subsequent Events: link:presentationLink link:calculationLink link:definitionLink