Derivative Instruments, Gain (Loss) [Table]
Derivative Instruments, Gain (Loss) [Table]
Entity Address, City or Town
Entity Address, City or Town
Public Utilities, Property, Plant and Equipment, Construction Work in Progress
Construction work in progress
Debt Instrument, Indebtedness To Capitalization Ratio Requirement for the Next Fiscal Year
Debt Instrument, Indebtedness To Capitalization Ratio Requirement for the Next Fiscal Year
Debt Instrument, Indebtedness To Capitalization Ratio Requirement for the Next Fiscal Year
Derivative Asset, Subject to Master Netting Arrangement, before Offset
Derivative Asset, Fair Value, Gross Asset
Common Collective Trued, Fixed Income Fund [Member]
Common Collective Trust, Fixed Income Fund [Member]
Common Collective Trust, Fixed Income Fund
Common Collective Trust - Fixed Income
Net income available for common stock
Net income available for common stock
Net Income (Loss) Available to Common Stockholders, Basic
Fair Value Disclosures [Abstract]
Fair Value Disclosures [Abstract]
Earnings Per Share [Abstract]
Earnings per share of common stock:
Jointly onwed Transmission Tie [Member]
Transmission Tie [Member]
Transmission Tie
Electric Transmission [Member]
Electric transmission
Fair Value, Inputs, Level 1 [Member]
Fair Value, Inputs, Level 1
Fair Value, Inputs, Level 1
Schedule of Accrued Liabilities [Table Text Block]
Schedule of Accrued Liabilities
Stock Issued During Period, Value, New Issues
Issuance of common stock
Net Cash Provided by (Used in) Financing Activities [Abstract]
Financing activities:
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect
Net change in cash, restricted cash and cash equivalents
Transportation [Member]
Transportation [Member]
Transportation
Increase (Decrease) in Other Operating Assets and Liabilities, Net
Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total
Other operating activities, net
Error Correction, Type [Axis]
Error Correction, Type [Axis]
Black Hills Wyoming and Wyoming Electric [Member]
Black Hills Wyoming and Wyoming Electric [Member]
Black Hills Wyoming and Wyoming Electric
Fair Value Measurement [Domain]
Fair Value Measurement [Domain]
Public Utilities, Property, Plant and Equipment, Generation or Processing
Production, processing and storage
Amendment Flag
Amendment Flag
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value
Restricted Stock and RSUs, total fair value of shares vested
Electricity [Member]
Electricity
Public utilities amount of requested system safety and integrity rider be moved to base rates.
Public Utilities Amount Of Requested System Safety And Integrity Rider Be Moved To Base Rates
Public Utilities, Amount of Requested System Safety and Integrity Rider be Moved to Base Rates
Accrued property, plant and equipment purchases at March 31,
Capital Expenditures Incurred but Not yet Paid
Regulated Operations [Abstract]
Regulated Operations [Abstract]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized
Performance Shares, Number of Shares Authorized
Subsequent Event Type [Domain]
Subsequent Event Type [Domain]
Short-Term Debt
Notes payable
Short-Term Debt, Total
Amount outstanding
Cost of Sales [Member]
Fuel, purchased power and cost of natural gas sold
Goodwill
Goodwill, Ending Balance
Goodwill, Beginning Balance
Goodwill
Goodwill, Total
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Intangible Assets
Jointly Owned Utility Plant Interests [Table]
Jointly Owned Utility Plant Interests [Table]
Performance Share Units - Performance Condition
Performance Share Units - Performance Condition [Member]
Performance Share Units - Performance Condition
Document Quarterly Report
Schedule of Long-Term Debt Instruments [Table]
Schedule of Long-term Debt Instruments [Table]
Hedge Funds, Multi-strategy [Member]
Hedge Funds
Environmental Restoration Costs [Member]
Decommissioning costs
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, Tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification,Tax (Benefit)
Schedule of Nonvested Share Activity [Table Text Block]
Schedule of Nonvested Share Activity
Short-Term Debt [Line Items]
Statement [Table]
Statement [Table]
Other Postretirement Benefits Plan [Member]
Other Postretirement Benefits Plan
Debt Instrument, Debt to Capitalization Ratio Requirement
Debt Instrument, Debt to Capitalization Ratio Requirement
Consolidated Indebtedness to Capitalization Ratio
Accumulated Other Comprehensive Income (Loss) [Table]
Accumulated Other Comprehensive Income (Loss) [Table]
Purchased Gas Cost Obligation [Member]
Purchased Gas Cost Obligation [Member]
Purchased Gas Cost Obligation
Auditor Firm ID
Auditor Firm ID
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Ending Balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value, Beginning Balance
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Cash Flow Hedge Gain (Loss) to be Reclassified within 12 Months
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months
Fuel - Electric Utilities
Energy Related Inventory, Other Fossil Fuel
Line of Credit Facility [Line Items]
Black Hills Retirement Plan [Member]
Black Hills Retirement Plan [Member]
Black Hills Corporation Pension Plan
Defined Benefit Plan, Expected Future Benefit Payment, Year Four
2026
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Product and Service [Axis]
Product and Service [Axis]
At The Market Equity Offering Program Shares Issued
At The Market Equity Offering Program Shares Issued
At The Market Equity Offering Program Shares Issued
Number of shares issued
Payments of Dividends
Payments of Dividends, Total
Dividends paid on common stock
Maximum amount outstanding (based on daily outstanding balances)
Line of Credit Facility, Maximum Amount Outstanding During Period
Wholesale [Member]
Wholesale [Member]
Wholesale
Fixed Income Funds [Member]
Fixed Income
Cumulative Effect, Period of Adoption, Adjustment [Member]
Cumulative Effect, Period of Adoption, Adjustment
Jointly Owned Utility Plant [Axis]
Jointly Owned Utility Plant [Axis]
Supply Commitment [Axis]
Supply Commitment [Axis]
Construction in Progress, Gross
Construction in progress, gross
Employee-related Liabilities, Current
Accrued employee compensation, benefits and withholdings
Employee-related Liabilities, Current, Total
Common Collective Trust, Cash And Cash Equivalents [Member]
Common Collective Trust, Cash And Cash Equivalents [Member]
Common Collective Trust, Cash And Cash Equivalents
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture
Share-based compensation (in shares)
Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture, Total
Collateral Already Posted, Aggregate Fair Value
Credit Risk Derivative Liabilities, at Fair Value
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax
Amounts reclassified from AOCI
Liabilities and Equity
TOTAL LIABILITIES AND TOTAL EQUITY
Plan Name [Domain]
Plan Name [Domain]
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total
Unbilled Revenue
Unbilled Receivables, Current
Electric Generation Equipment [Member]
Production, Electric
Derivative Liability, Current
Derivative liabilities, current
Entity Incorporation, State or Country Code
Entity Incorporation, State or Country Code
Income Statement [Abstract]
Income Statement [Abstract]
Timing of Transfer of Good or Service [Axis]
Timing of Transfer of Good or Service [Axis]
At The Market Equity Program Proceeds from Sale of Stock
At The Market Equity Program Proceeds from Sale of Stock
At The Market Equity Program Proceeds from Sale of Stock
Proceeds, (net of issuance costs)
Unrealized Gain (Loss) on Cash Flow Hedging Instruments
Derivative, Gain on Derivative
Derivative Liability
Derivative Liability, Total
Derivative, Liabilities, Fair Value Disclosure
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Cash Flow Hedging
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, Tax
(Tax) benefit on benefit plan liability adjustments - net gain (loss)
Liabilities, Current
Current liabilities
Total current liabilities
Weighted average number of shares of common stock, basic and diluted[Abstract]
Weighted Average Number of Shares Outstanding, Basic and Diluted [Abstract]
Weighted average common shares outstanding:
Adjusted Operating Income (Loss)
Adjusted Operating Income (Loss)
Adjusted operating income (loss)
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period
Fair Value, Recurring [Member]
Fair Value, Measurements, Recurring
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax
(Tax) benefit on reclassification adjustment of benefit plan liability - prior service cost
Arkansas Public Service Commission
Arkansas Public Service Commission [Member]
Arkansas Public Service Commission
Long-Term Purchase Commitment, Category of Item Purchased [Domain]
Long-term Purchase Commitment, Category of Item Purchased [Domain]
Energy [Axis]
Energy [Axis]
Error Correction, Other [Member]
Error Correction, Other
Treasury Stock, Shares
Treasury stock, shares
Treasury Stock, Shares, Total
Derivative Asset
Derivative Assets, Fair Value Disclosure
Derivative Asset, Total
Cumulative Effect, Period of Adoption [Axis]
Cumulative Effect, Period of Adoption [Axis]
Natural Gas, Storage [Member]
Gas, Storage
Jointly Owned Utility Plant Interests [Line Items]
Jointly Owned Utility Plant Interests [Line Items]
Corporate, Non-Segment [Member]
Corporate, Non-Segment
Corporate and Other
Intercompany Customers [Member]
Intercompany Customers [Member]
Intercompany Customers
The Company Retirement portion of the defined contribution plan in which there is no employee contribtuion required to receive a contribution. The contribution is based on a calculation of age and service. [Member]
Defined Contribution Plan, Company Retirement [Member]
Defined Contribution Plan, Company Retirement
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates
Public Utilities Amount of System Safety and Integrety Rider Moved to Base Rates
Asset Retirement Obligations [Table]
Asset Retirement Obligations [Table]
Asset Retirement Obligations [Table]
Entity Small Business
Entity Small Business
Weighted average interest rates
Line of Credit Facility, Interest Rate at Period End
Over-the-Counter [Member]
Over the Counter
Gas Transmission Equipment [Member]
Gas transmission
Cash, restricted cash and cash equivalents end of period
Cash, restricted cash and cash equivalents beginning of period
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Total
Hedging Relationship [Axis]
Hedging Relationship [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax
Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, Tax, Total
(Tax) benefit on reclassification adjustment of benefit plan liability - net loss
Payments to Noncontrolling Interests
Distributions to non-controlling interests
Assets, Current
Current assets
Total current assets
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment [Line Items]
Public Utilities, Approved Return on Equity, Percentage
Public Utilities, Approved Return on Equity, Percentage
Schedule of Short-Term Debt [Table]
Variable Interest Entity Disclosure [Text Block]
Variable Interest Entity
Weighted Average Number of Shares Outstanding, Basic
Basic (in shares)
Weighted Average Number of Shares Outstanding, Basic, Total
Weighted average shares - Basic (in shares)
City Area Code
City Area Code
Schedule of Net Benefit Costs [Table Text Block]
Components of Net Periodic Benefit Cost
Billed Accounts Receivable
Less: Allowance for Credit Losses
Accounts Receivable, before Allowance for Credit Loss, Current
Derivative Instrument, Loss Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]
Employee benefit plans and related deferred taxes liabilities.
Employee Benefit Plans And Related Deferred Taxes Liabilities [Member]
Employee benefit plan costs and related deferred taxes
Comprehensive Income (Loss) Note [Text Block]
Other Comprehensive Income
Gas Gathering and Processing Equipment [Member]
Production, Gas
Share-Based Payment Arrangement [Abstract]
Public utilities, amount of requested system safety and integrity rider be moved to base rates and termination
Public Utilities, Requested Return on Equity, Percentage
Public Utilities, Requested Return on Equity, Percentage
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers
Settlement Total of Plan to Provide TCJA and State Tax Reform benefits to Customers
Federal Energy Regulatory Commission (FERC) Common Use System (CUS) [Member]
Federal Energy Regulatory Commission (FERC) Common Use System (CUS) [Member]
Federal Energy Regulatory Commission (FERC) Common Use System (CUS)
Document Period End Date
Document Period End Date
Payments of Stock Issuance Costs
Payments of Stock Issuance Costs
Restricted Stock [Member]
Restricted Stock
Common Stock, Dividends, Per Share, Cash Paid
Dividends on common stock (usd per share)
Black Hills Energy - Colorado Electric
Black Hills Energy - Colorado Electric [Member]
Black Hills Energy - Colorado Electric
Basis Swap [Member]
Natural gas basis swaps purchased
Net periodic expense (benefit)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)
Performance Share Units - Market Condition
Performance Share Units - Market Condition [Member]
Performance Share Units - Market Condition
Schedule of Segment Reporting Information, by Segment
Schedule of Segment Reporting Information, by Segment [Table Text Block]
Statistical Measurement [Axis]
Statistical Measurement [Axis]
Wyoming Electric [Member]
Wyoming Electric [Member]
Wyoming Electric
Public Utilities, Amount of Requested System Safety and Integrity Rider be Moved to Base Rates and Termination
Public Utilities Amount Of Requested System Safety And Integrity Rider Be Moved To Base Rates and Termination
Public utilities amount of requested system safety and integrity rider be moved to base rates and termination.
Other Assets, Current
Other current assets
Subsequent Event [Line Items]
Subsequent Event [Line Items]
Defined Benefit Plan, Expected Future Benefit Payment, Year One
2023
Other Asset Impairment Charges
Impairment of investment
Impairment of investment
Number of Years TCJA and State Tax Reform Benefits to be Provided to Customers
Number of Years TCJA and State Tax Reform Benefits to be Provide to Customers
Number of Years TCJA and State Tax Reform Benefits to be Provide to Customers
Assets
TOTAL ASSETS
Total Assets
Derivative Contract [Domain]
Derivative Contract [Domain]
Derivative Contract [Domain]
Contract Subject to Master Netting Arrangement [Member]
Contract Subject to Master Netting Arrangement [Member]
Contract Subject to Master Netting
Derivative [Line Items]
Derivative [Line Items]
Derivative, Term of Contract
Gas Price Derivatives - Term of Contract
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Rate of increase in compensation levels
Long-Term Debt, Excluding Current Maturities
Long-term debt, net of current maturities
Long-Term Debt, Excluding Current Maturities, Total
Long-term debt, net of current maturities
Earnings Per Share, Diluted
Earnings per share, Diluted (usd per share)
Earnings Per Share, Diluted, Total
Total earnings (loss) per share of common stock, Diluted (usd per share)
Retirement Plan Type [Axis]
Retirement Plan Type [Axis]
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Schedule of Short-Term Debt [Table Text Block]
Schedule of Short-term Debt
Income Taxes Receivable, Current
Income tax receivable, net
Black Hills Energy - Iowa Gas
Black Hills Energy - Iowa Gas [Member]
Black Hills Energy - Iowa Gas
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Rate of increase in compensation levels
Entity Address, Postal Zip Code
Entity Address, Postal Zip Code
Plant Acquisition Costs
Plant Acquisition Adjustment [Member]
Plant acquisition adjustment
Document Fiscal Period Focus
Document Fiscal Period Focus
Management's Statement
Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block]
Pension Plan [Member]
Pension Plan
Defined Benefit Pension Plans
Revolving Credit Facility
Revolving Credit Facility [Member]
Public Utilities, Property, Plant and Equipment Excluding Construction in Progress
Public Utilities, Property, Plant and Equipment Excluding Construction in Progress
Total plant in service before construction work in progress
Derivative [Table]
Derivative [Table]
Payments for (Proceeds from) Other Investing Activities
Other investing activities
Other investing activities
Interest expense, net
Interest expense, net
Interest Income (Expense), Net
Interest Income (Expense), Net, Total
Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements
Equity compensation (in shares)
Other Capitalized Property Plant and Equipment [Member]
General
Investment Income, Interest
Interest income
Net unrealized gains (losses) on commodity derivatives (net of tax of $268 and $(340), respectively)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), after Adjustments, Tax, Total
Net cash (used in) financing activities
Net Cash Provided by (Used in) Financing Activities
Other regulatory assets [Member]
Other Regulatory Assets [Member]
Other regulatory assets
Short-Term Debt, Type [Axis]
Short-term Debt, Type [Axis]
Federal Energy Regulatory Commission (FERC) [Member]
Federal Energy Regulatory Commission (FERC) [Member]
Federal Energy Regulatory Commission (FERC)
Schedule of Regulatory Assets and Liabilities
Schedule of Regulatory Assets and Liabilities [Table Text Block]
Schedule of Regulatory Assets and Liabilities
Public Utilities, Approved Rate Increase (Decrease), Amount
Public Utilities, Approved Rate Increase (Decrease), Amount
Accounts Receivable, Allowance for Credit Loss, Recovery
Recoveries and Other Additions
Statement of Financial Position [Abstract]
Statement of Financial Position [Abstract]
Gas Utilities [Member]
Gas Utilities [Member]
Gas Utilities
Securities Act File Number
Entity File Number
The amount of the total payout for an employee service share-based compensation award for other than options that has been accrued at the Balance Sheet date. The total value includes the stock price, dividends and the percentage payout value.
Employee Service Share-based Compensation, Other Than Options, Total Payout Value
Target shares, value
Statement of Cash Flows [Abstract]
Statement of Cash Flows [Abstract]
Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider.
Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider. [Member]
Global Settlement agreement with KCC Staff and various intervenors for a general rate increase and renewal of its safety and integrity rider.
Derivative Asset, Current
Derivative assets, current
Public Utilities, Term Extension of System Saftey and Integrity Rider
Public Utilities, Term Extension of System Saftey and Integrity Rider
Public Utilities, Term Extension of System Saftey and Integrity Rider
Proceeds from Issuance of Debt
Proceeds from Issuance of Debt
Retirement Benefits [Text Block]
Employee Benefit Plans
Jointly Owned Utility Plant, Ownership Amount of Construction Work in Progress
Construction Work in Progress
Statistical Measurement [Domain]
Statistical Measurement [Domain]
Statement of Stockholders' Equity [Abstract]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments
Annual TCJA-Related Customer Billing Credits
Annual TCJA-Related Customer Billing Credits
Annual TCJA-Related Customer Billing Credits
Public Utilities General Disclosures [Table]
Public Utilities General Disclosures [Table]
Auditor Location
Auditor Location
Real Estate Funds [Member]
Real Estate Funds
Common Collective Trust - Real Estate
Regulatory Liability [Axis]
Regulatory Liability [Axis]
Fuel costs incurred that are directly related to goods produced and sold and services rendered during the reporting period, combined with the amount of purchased power charged against earnings for the period, and cost of gas sold to customers for the period.
Fuel, Purchased Power and Cost of Gas Sold
Fuel, purchased power and cost of natural gas sold
Fuel, purchased power and cost of natural gas sold
Legal Entity [Axis]
Legal Entity [Axis]
Cushion Gas - Not Depreciated [Member]
Cushion Gas - Not Depreciated [Member]
Cushion gas - not depreciable
Stockholders' Equity Note [Abstract]
Stockholders' Equity Note [Abstract]
Fair Value, by Balance Sheet Grouping [Table Text Block]
Fair Value, by Balance Sheet Grouping
Subsequent Events [Abstract]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Reclassification out of Accumulated Other Comprehensive Income [Axis]
Market Off-System Sales [Member]
Market Off-System Sales [Member]
Market - off-system sales
Black Hills Energy, Kansas Gas
Black Hills Energy, Kansas Gas [Member]
Black Hills Energy, Kansas Gas
Proceeds from Issuance of Common Stock
Common stock issued
Long-Term Debt, Type [Axis]
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years
2027-2031
Ratio of Indebtedness to Net Capital
Consolidated Indebtedness to Capitalization Ratio
Deferred Income Tax Expense (Benefit)
Total Deferred
Deferred income taxes
Deferred Income Tax Liabilities, Net
Deferred income tax liabilities, net
Property, Plant and Equipment [Table Text Block]
Property, Plant and Equipment
Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block]
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
Proceeds from (Payments for) Other Financing Activities
Other financing activities
Revenue from Contract with Customer [Text Block]
Revenue
External Customers
External Customers [Member]
External Customers
Electric Distribution [Member]
Electric distribution
Antidilutive Securities [Axis]
Antidilutive Securities Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis]
Derivative, Remaining Maturity
Derivative, Remaining Maturity
Jointly Owned Utility Plant, Gross Ownership Amount of Plant in Service
Plant in Service
Derivative, Loss on Derivative
Derivative, Loss on Derivative
Increase (Decrease) in Accounts Receivable and Other Operating Assets
Accounts receivable and other current assets
Schedule of Deferred Financing Costs expensed on the Statement of Income and/or net amount presented on the Statement of Financial Position [Table Text Block]
Deferred Financing Costs [Table Text Block]
Deferred Financing Costs
Selected Balance Sheet Information
Supplemental Balance Sheet Disclosures [Text Block]
Accrual for Taxes Other than Income Taxes, Current
Accrued property taxes
Transmission Service Agreement [Member]
Transmission Service Agreement
Credit Facility [Domain]
Subsequent Events [Text Block]
Subsequent Events
Not Designated as Hedging Instrument [Member]
Not Designated as Hedging Instrument
Weighted Average Number of Shares Outstanding, Diluted
Diluted (in shares)
Weighted average shares - diluted (in shares)
Derivative, Nonmonetary Notional Amount
Derivative, Nonmonetary Notional Amount
Settlement of plan to provide TCJA-related customer billing credits to its customers. The billing credits, which represent a disposition of excess deferred income tax benefits resulting from the TCJA, will be delivered to customers in the next fiscal year.
Settlement of plan to provide TCJA-related customer billing credits to its customers
Settlement of plan to provide TCJA-related customer billing credits to its customers
Credit Facility [Axis]
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Share-based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount
Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC.
Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC. [Member]
Settlement agreement reached with CPUC Staff and various intervenors, subject to the review and approval by an Administrative Law Judge and the CPUC.
Defined Benefit Plan, Plan Assets, Amount
Ending fair value of plan assets
Beginning fair value of plan assets
Defined Benefit Plan, Plan Assets, Amount
Portion at Fair Value Measurement [Member] [Default]
Portion at Fair Value Measurement [Member]
Portion at Fair Value Measurement
Energy Related Derivative [Member]
Energy Related Derivative
Public Utilities, Requested Term Extension of System Safety and Integrity Rider
Public Utilities, Requested Term Extension of System Safety and Integrity Rider
Public Utilities, Requested Term Extension of System Safety and Integrity Rider
Schedule of Guarantor Obligations [Table Text Block]
Schedule of Guarantor Obligations
Commercial Paper [Member]
Commercial Paper
Segment Reporting, Asset Reconciling Item [Line Items]
Segment Reporting, Asset Reconciling Item
Current Fiscal Year End Date
Current Fiscal Year End Date
Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included.
Derivative Liabilities, Noncurrent [Member]
Derivative Liabilities, Noncurrent
Other deferred credits and other liabilities
Pension and Other Postretirement Benefits Cost (Reversal of Cost)
Employee benefit plans
Pension and Other Postretirement Benefits Cost (Reversal of Cost), Total
[Table Text Block] for Schedule of Unit Contingent Capacity [Table]
Schedule of Unit Contingent Capacity [Table Text Block]
Schedule of Unit Contingent Capacity
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Jointly Owned Utility Plant, Proportionate Ownership Share
Jointly Owned Utility Plant, Proportionate Ownership Share
Ownership Interest
Other Assets, Noncurrent
Other assets, non-current
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Ending balance
Beginning balance
Total equity
Entity Address, Address Line One
Entity Address, Address Line One
Regulatory Asset [Domain]
Regulatory Assets [Domain]
Defined Benefit Plan, Plan Assets, Category [Axis]
Defined Benefit Plan, Plan Assets, Category [Axis]
Derivative Instruments, Gain (Loss) [Table Text Block]
Derivative Instruments, Gain (Loss)
Weighted average interest rates
Debt, Weighted Average Interest Rate
Amount of operating expenses for the period including selling, general, and administrative expenses, costs include routine repairs and maintenance and operations.
Operating Expense, Maintenance, Operations, and Other Costs and Expense
Operations and maintenance
Noncontrolling Interest [Member]
Noncontrolling Interest
Derivatives, Fair Value [Line Items]
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral
Derivative Asset, Fair Value, Amount Not Offset Against Collateral
Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral, Total
An assumption for the next fiscal year as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation
Defined Benefit Plan Assumptions Used In Calculating Net Periodic Benefit Cost Expected Rate of Return On Assets For Next Fiscal Year
Defined Benefit Plan Assumptions Used In Calculating Net Periodic Benefit Cost Expected Rate of Return On Assets For Next Fiscal Year
Transaction Type [Axis]
Transaction Type [Axis]
The percentage paid in cash for the accrued equity portion of the performance share plan upon change in control
The percentage paid in cash for the accrued equity portion of the performance share plan upon change in control
The percentage paid in cash for the accrued equity portion of the performance share plan upon change in control
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax
Supplemental Cash Flow Information [Abstract]
Supplemental cash flow information:
Iowa Utilities Board (IUB)
Iowa Utilities Board (IUB) [Member]
Iowa Utilities Board (IUB)
Regulatory Agency [Domain]
Regulatory Agency [Domain]
Natural Gas Physical Purchases [Member]
Natural Gas Physical Purchases [Member]
Natural gas physical contracts, net
Income tax (expense)
Income Tax Expense (Benefit)
Income Tax Expense (Benefit)
Total Current and Deferred
Income Tax Expense (Benefit)
Defined Benefit Plan, Accumulated Benefit Obligation
Defined Benefit Plan, Accumulated Benefit Obligation
The 401K defined contribution plan, which requires a contribution from the employee in order to receive a matching contribution (within limits) from the employer [Member]
Defined Contribution Plan, 401K [Member]
Defined Contribution Plan, 401K
Income Tax Disclosure [Text Block]
Income Taxes
Settlement Reached with the Regulatory Agency
Settlement Reached with the Regulatory Agency [Member]
Settlement Reached with the Regulatory Agency
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Other Accrued Liabilities, Current
Other (none of which is individually significant)
Payments to Acquire Property, Plant, and Equipment
Payments to Acquire Property, Plant, and Equipment, Total
Property, plant and equipment additions
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Discount Rate
Income Tax Disclosure [Abstract]
Income Tax Disclosure [Abstract]
Line of Credit Facility [Table]
Derivatives and Fair Value [Text Block]
Fair Value Measurements
Schedule of Change in Asset Retirement Obligation [Table Text Block]
Schedule of Change in Asset Retirement Obligation
Arkansas Public Service Commission (APSC)
Arkansas Public Service Commission (APSC) [Member]
Arkansas Public Service Commission (APSC)
Public Utilities, General Disclosures [Line Items]
Public Utilities, General Disclosures [Line Items]
Stock Issued During Period, Shares, New Issues
Issuance of common stock (in shares)
Summary of at-the-marke activity.
Summary of At-the-Marke Activity [Table Text Block]
Summary of ATM Activity
Deferred Fuel Costs [Member]
Deferred energy and fuel cost adjustments
Deferred energy and gas costs
Reported Value Measurement [Member]
Carrying Amount
Black Hills Energy, Arkansas
Black Hills Energy, Arkansas [Member]
Black Hills Energy, Arkansas
Costs and Expenses
Operations and maintenance, including taxes
Costs and Expenses, Total
Fair Value Hierarchy and NAV [Axis]
Fair Value Hierarchy and NAV [Axis]
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Net amortization of prior service cost
Auditor Name
Auditor Name
Wygen III - Black Hills Power's coal-fired power generation plant that commenced operations on April 1, 2010.[Member]
Wygen III Generating Facility [Member]
Wygen III Generating Facility
Contingent Capacity Amounts on Wygen III
Public Utilities, Property, Plant and Equipment, Transmission
Transmission
Average price per share
At The Market Equity Offering Program Average Price Per Share
At the market equity offering program average price per share.
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Tax
(Tax) benefit on benefit plan liability adjustments - prior service costs
Operating Income (Loss)
Operating income (loss)
Operating income
Stated interest rate (percent)
Debt Instrument, Interest Rate, Stated Percentage
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period
Number of shares available for future issuance
Regulatory Liability
Regulatory liabilities
Regulatory liabilities
Regulatory Asset, Noncurrent
Regulatory assets, non-current
Credit Facility and Short Term Debt Covenants
Credit Facility and Short Term Debt Covenants [Table Text Block]
Credit Facility and Short Term Debt Covenants
Colorado Public Utilities Commission (CPUC) [Member]
Colorado Public Utilities Commission (CPUC) [Member]
Colorado Public Utilities Commission (CPUC)
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Requisite Service Period
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period
Entity Filer Category
Entity Filer Category
Reconciliation of Assets from Segment to Consolidated [Table]
Reconciliation of Assets from Segment to Consolidated [Table]
Liabilities, Noncurrent [Abstract]
Deferred credits and other liabilities:
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate (comprised percent of historic volatility)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate (comprised percent of historic volatility)
Volatility Rate - Historic
Tabular disclosure of proportionate interests in jointly owned plants. Includes the amount of plants in service, the accumulated provision for depreciation (if available), the amount of facilities under construction, and the proportionate share. Includes statements that the amounts represent the company's share in each joint plant and that it must provide its own financing. Information concerning two or more plants on the same site may be combined. States that the company's share of direct expenses of the joint facilities is included in the corresponding operating expenses on its income statement (for example, maintenance and other operating expense). This schedule includes both Utility and non-Utility facilities. [Table Text Block]
Schedule Of Jointly Owned Facilities [Table Text Block]
Schedule of Jointly Owned Utility Plants
Derivative Asset, Statement of Financial Position [Extensible Enumeration]
Regulatory Asset [Axis]
Regulatory Asset [Axis]
Other regulatory liabilities [Member]
Other Regulatory Liabilities [Member]
Other regulatory liabilities
Operating Expenses
Total operating expenses
Entity Current Reporting Status
Entity Current Reporting Status
Kansas Corporation Commission (KCC)
Kansas Corporation Commission (KCC) [Member]
Kansas Corporation Commission (KCC)
Inventory, Net
Materials, supplies and fuel
Total materials, supplies and fuel
The offsetting entry to other income when an enterprise capitalizes, as part of the cost of plant and equipment, the cost of financing construction as financed partially by equity.
Allowance For Funds Used During Construction [Member]
Deferred taxes on AFUDC
Number of Megawatts Capacity Purchased
Number of Megawatts Capacity Purchased
Number of Megawatts Capacity Purchased
Restricted Cash and Investments, Current
Restricted cash and equivalents
Restricted Cash and Investments, Current, Total
Environmental costs associated with utility property [Member]
Environmental [Member]
Environmental
Stockholders' Equity Attributable to Parent
Stockholders' Equity Attributable to Parent, Ending Balance
Stockholders' Equity Attributable to Parent, Beginning Balance
Total stockholders’ equity
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Rate Review Filed with the Regulatory Agency [Member]
Rate Review Filed with the Regulatory Agency [Member]
Rate Review Filed with the Regulatory Agency
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss)
Costs provided for the retirement of certain long-live assets that are reasonably expected to be recovered in utility rates charged to customers [Line Items]
Asset Retirement Obligation Costs [Line Items]
Asset Retirement Obligation Costs [Line Items]
Entity Tax Identification Number
Entity Tax Identification Number
Income Statement Location [Axis]
Income Statement Location [Axis]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Shares Forfeited
Common stock $1 par value; 100,000,000 shares authorized; issued 66,670,709 and 66,140,396 shares, respectively
Common Stock, Value, Issued
Consolidation Items [Axis]
Consolidation Items [Axis]
Retained Earnings (Accumulated Deficit)
Retained earnings
Retained Earnings (Accumulated Deficit), Total
Cumulative Effect, Period of Adoption [Domain]
Cumulative Effect, Period of Adoption [Domain]
Equity Components [Axis]
Equity Components [Axis]
Asset Retirement Obligation Disclosure [Text Block]
Asset Retirement Obligations
Derivative, Gain (Loss) on Derivative, Net
Derivative, Gain (Loss) on Derivative, Net
Derivative, Gain (Loss) on Derivative, Net, Total
Black Hills Service Company [Member]
Black Hills Service Company [Member]
Black Hills Service Company
Public Utilities General Disclosures [Table Text Block]
Property, Plant and Equipment (AFUDC)
Liabilities, Other than Long-Term Debt, Noncurrent
Total deferred credits and other liabilities
Derivative Instrument, Gain Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]
Error Correction, Type [Domain]
Error Correction, Type [Domain]
Regulatory Liability, Noncurrent
Regulatory liabilities, non-current
Capital Addition Requirements by the FERC Joint-Access Transmission Tariff
Capital Addition Requirements by the FERC Joint-Access Transmission Tariff
Capital Addition Requirements by the FERC Joint-Access Transmission Tariff
Black Hills Energy, Arkansas Gas
Black Hills Energy, Arkansas Gas [Member]
Black Hills Energy - Arkansas Gas
Defined Benefit Plan, Expected Future Benefit Payment, Year Three
2025
Percentage of performance based compensation to be paid out in cash.
Share Based Compensation Arrangement By Share Based Payment Award, Payout, Cash Percentage
Performance Share Award Payout, Cash Percentage
Entity Emerging Growth Company
Entity Emerging Growth Company
Operating Expenses [Abstract]
Operating expenses:
Defined Benefit Plan, Interest Cost
Interest cost
Energy Related Inventory, Natural Gas in Storage
Natural gas in storage
Retirement Plan Type [Domain]
Defined Benefit Plans
Senior Unsecured Notes Due 2028
Senior Unsecured Notes Due 2028 [Member]
Senior unsecured notes due 2028.
Account Receivable Schedule
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
Accounts Receivable and Allowance for Doubtful Accounts
[Table Text Block] for Performance Plan Payouts [Table]
Performance Plan Payouts [Table Text Block]
Performance Plan Payouts
Reclassification adjustments of benefit plan liability - prior service cost (net of tax of $0 and $6, respectively)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, after Tax
Defined Benefit Plan, Plan Assets, Category [Domain]
Defined Benefit Plan, Plan Assets, Category [Domain]
The depreciation, depletion or amortization period remaining on an asset.
Depreciation, Depletion And Amortization, Remaining Amortization Period
Depreciation, depletion and amortization, remaining amortization period
Public Utilities, Regulatory Proceeding [Domain]
Public Utilities, Regulatory Proceeding [Domain]
Transaction [Domain]
Transaction [Domain]
Jointly Owned Wygen I Generating Facility [Member]
Wygen I Generating Facility [Member]
Wygen I Generating Facility
Interest Rate Swap and Commodity Derivative
Interest Rate Swap and Commodity Derivative [Member]
Interest Rate Swap and Commodity Derivative
Defined Benefit Plan, Service Cost
Service Cost
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum
Volatility range for the peer group, Maximum
Increase (Decrease) in Other Accounts Payable and Accrued Liabilities
Accounts payable and other current liabilities
Retirement Benefits [Abstract]
Document Transition Report
Document Transition Report
Assets, Fair Value Disclosure
Derivative Assets, Total
Assets, Fair Value Disclosure, Total
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Granted (usd per share)
Nonoperating Income (Expense)
Total other income (expense)
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value
Transmission/Other [Member]
Transmission/Other [Member]
Transmission/Other
Postretirement Health Coverage [Member]
Postretirement Health Coverage
Depreciation, Depletion and Amortization
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization, Total
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period End
Accumulated Other Comprehensive Income (Loss), Net of Tax, Period Start
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total
Account Receivable, net
Accounts Receivable, after Allowance for Credit Loss, Current, Total
Accounts Receivable, after Allowance for Credit Loss, Current
Accounts receivable, net
Estimated Future Employer Contributions in Next Fiscal Year
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Table Text Block]
Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Energy [Domain]
Energy [Domain]
Other Comprehensive Income (Loss), Net of Tax
Other comprehensive income (loss), net of tax
Other comprehensive income, net of tax
Commodity Contract [Member]
Commodity Contract
Commodity derivatives
Weighted average cost of capital
Weighted Average Cost of Capital
Weighted Average Cost of Capital
Long-Term Purchase Commitment [Table Text Block]
Long-term Purchase Commitment
Gas Distribution Equipment [Member]
Gas distribution
Net Income (Loss) Attributable to Parent
Net income available for common stock
Net income available for common stock
Weighted Average [Member]
Weighted Average
Price Risk Derivative [Member]
Gas price derivatives
Long-Term Purchase Commitment [Line Items]
Long-term Purchase Commitment [Line Items]
Common Collective Trust, Equity Fund [Member]
Common Collective Trust, Equity Fund [Member]
Common Collective Trust, Equity Fund
Common Collective Trust - Equity
Share-based Compensation Arrangement by Share Based Payment Award, Performance Goal - The Company's Total Shareholder Return for the Prescribed Period as a Percentile of Peer Group Performance
Share-based Compensation Arrangement by Share Based Payment Award, Performance Goal - Percentile of Peer Group Performance
Performance Goal - Percentile of Peer Group Performance
Long [Member]
Long
Electric Utilities Segment [Member]
Electric Utilities [Member]
Electric Utilities
Asset Recoverable Gas Costs [Member]
Deferred gas cost adjustments
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]
Schedule of Fair Value Hierarchy, Measured on Recurring Basis
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset, Total
Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset
Additional Paid-in Capital [Member]
Additional Paid-in Capital
Number of shares issued
At The Market Equity Offering Program Shares Issued But Not Settled
At the market equity offering program shares issued but not settled.
Derivative, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration]
Utility Bond Issuance Costs recoverable over the life of the original issue, or if refinanced, over the life of the new issue[Member]
Bond Issuance Costs [Member]
Loss on reacquired debt
Income Tax Disclosure [Line Items]
Income tax disclosure.
Schedule of Maturities of Long-Term Debt [Table Text Block]
Schedule of Maturities of Long-term Debt
Entity Registrant Name
Entity Registrant Name
Liabilities, Fair Value Disclosure
Derivative Liabilities, Total
Liabilities, Fair Value Disclosure, Total
Less: Allowance for Credit Losses
Balance at End of Year
Balance at Beginning of Year
Less: Allowance for Credit Losses
Accounts Receivable, Allowance for Credit Loss, Current
Cash and Cash Equivalents, at Carrying Value
Cash and Cash Equivalents, at Carrying Value, Total
Cash and cash equivalents
Public Utilities, Requested Rate Increase (Decrease), Amount
Public Utilities, Requested Rate Increase (Decrease), Amount
Earnings Per Share
Earnings Per Share [Text Block]
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions
Revenues
Revenue
Revenues, Total
Share-Based Payment Arrangement, Noncash Expense
Stock compensation
Share-Based Payment Arrangement, Noncash Expense, Total
Statement of Comprehensive Income [Abstract]
Statement of Comprehensive Income [Abstract]
Property, Plant and Equipment, Net
Property, plant and equipment of variable interest entities, net
Total property, plant and equipment, net
Award Type [Domain]
Award Type [Domain]
Statement [Line Items]
Statement [Line Items]
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture
Share-based compensation
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture, Total
Title of 12(b) Security
Title of 12(b) Security
Nebraska Publc Service Commission (NPSC)
Nebraska Publc Service Commission (NPSC) [Member]
Nebraska Publc Service Commission (NPSC)
Noncontrolling Interest in Variable Interest Entity
Non-controlling interest
Common Stock [Member]
Common Stock
Net Cash Provided by (Used in) Operating Activities [Abstract]
Operating activities:
Equity Component [Domain]
Equity Component [Domain]
Revenue from Contract with Customer, Excluding Assessed Tax
Revenue from contracts with customers
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest
Income before income taxes
Entity Address, State or Province
Entity Address, State or Province
Assets, Noncurrent, Other than Noncurrent Investments and Property, Plant and Equipment
Total other assets, non-current
Public Utilities, Regulatory Proceeding [Axis]
Public Utilities, Regulatory Proceeding [Axis]
Regulatory Liability [Domain]
Regulatory Liability [Domain]
Payout percentage for share based compensation to be issued in shares of common stock.
Share Based Compensation Arrangement By Share Based Payment Award, Payout, Shares Percentage
Performance Share Award Payout, Shares of Common Stock Percentage
Derivative Instrument, Gain (Loss) Reclassified from AOCI into Income, Effective Portion, Statement of Income or Comprehensive Income [Extensible Enumeration]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest
Comprehensive income
Document Type
Document Type
Interest Paid, Excluding Capitalized Interest, Operating Activities
Interest (net of amounts capitalized)
Stock Issued During Period, Shares, Treasury Stock Reissued
Stock Issued During Period, Shares, Treasury Stock Reissued
Recognized net actuarial loss (gain)
Defined Benefit Plan, Amortization of Gain (Loss)
Entity Shell Company
Entity Shell Company
Increase (Decrease) in Inventories
Increase (Decrease) in Inventories, Total
Materials, supplies and fuel
Share Based Compensation Arrangement By Share Based Payment Award - Performance Period Used to Estimate Expected Share Payout
Share Based Compensation Arrangement By Share Based Payment Award - Performance Period Used to Estimate Expected Share Payout
Share Based Compensation Arrangement By Share Based Payment Award - Performance Period Used to Estimate Expected Share Payout
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Segment Reporting Information
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion
Derivative Instruments, Gain Reclassified from Accumulated OCI into Income, Effective Portion
Defined Benefit Plan, Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate
Trend Year
Fair Value, Recurring and Nonrecurring [Table]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table]
Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included.
Derivative Assets, Noncurrent [Member]
Derivative Assets, Noncurrent
Other assets, non-current
Reclassification out of Accumulated Other Comprehensive Income [Table]
Reclassification out of Accumulated Other Comprehensive Income [Table]
Tri-State Generation and Transmission Association
Tri-State Generation and Transmission Association [Member]
Tri-State Generation and Transmission Association
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract]
Security Exchange Name
Security Exchange Name
Revenue from Contract with Customer [Abstract]
Revenue from Contract with Customer [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share
Net cash provided by operating activities
Net Cash Provided by (Used in) Operating Activities
Asset Retirement Obligation, Revision of Estimate
Revisions to Prior Estimates
The percentage target for payout of equity compensation awards
Share-based Compensation Arrangement by Share-based Payment Award, Payout, Percentage of Target
Performance Share Award, Percentage of Target
Future [Member]
Natural gas futures purchased
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition
Weighted-average recognition period
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]
Regulatory Liability, Current
Regulatory liabilities, current
Regulatory liabilities, current
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Other comprehensive income (loss), net of tax:
Transferred at Point in Time [Member]
Services transferred at a point in time
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Abstract]
Natural Gas for distribution [Member]
Natural Gas, Distribution [Member]
Natural Gas, Distribution
Interest Payable, Current
Accrued interest
Gas Supply Contract Termination [Member]
Gas Supply Contract Termination [Member]
Gas supply contract termination
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Discount rate
Schedule of Defined Benefit Plans Contributions for the current year and specific future years.
Schedule of Defined Benefit Plans Contributions [Table Text Block]
Schedule of Defined Benefit Plans Contributions
Audit Information [Abstract]
Audit Information [Abstract]
New Accounting Pronouncements, Policy [Policy Text Block]
Recently Issued and Adopted Accounting Standards
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Common Stock, Shares, Outstanding
Ending balance (in shares)
Beginning balance (in shares)
Rate Review Approved by Regulatory Agency
Rate Review Approved by Regulatory Agency [Member]
Rate Review Approved by Regulatory Agency
Debt Disclosure [Text Block]
Financing
Fair Value, Inputs, Level 2 [Member]
Fair Value, Inputs, Level 2
Proceeds from Issuance of Long-Term Debt
Long-term debt - issuance
Proceeds from Issuance of Long-Term Debt, Total
Natural Gas [Member]
Natural Gas
Net Cash Provided by (Used in) Investing Activities [Abstract]
Investing activities:
Selected Balance Sheet Information [Abstract]
Selected Balance Sheet Information [Abstract]
Selected Balance Sheet Information [Abstract]
Commitments and Contingencies
Commitments, contingencies and guarantees (Note 3)
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider
Public utilities amount of system safety and integrity rider moved to base rates and termination of the system safety and integrity rider.
Common Stock, Shares, Issued
Common stock, shares, issued
Asset Retirement Obligation, Liabilities Settled
Liabilities Settled
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Risk Management And Derivatives
Supplemental Employee Retirement Plan [Member]
Supplemental Employee Retirement Plan
Supplemental Non-Qualified Defined Benefit Plans
Schedule of Regulatory Assets and Liabilities [Text Block]
Regulatory Matters
Minimum [Member]
Minimum
Hedging Designation [Axis]
Hedging Designation [Axis]
Public utilities, number of former riders replaced with a new comprehensive safety and integrity rider.
Public Utilities Number Of Former Riders Replaced With A New Comprehensive Safety And Integrity Rider
Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included.
Derivative Liabilities, Current [Member]
Derivative liabilities, current
Other [Member]
Other [Member]
Other revenues
Netting Contract by Category [Axis]
Netting Contract, Category [Axis]
Netting Contract by Category [Axis]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Segments [Domain]
Segments [Domain]
Reporting Segment [Domain]
Accrued Liabilities, Current
Total accrued liabilities
Accrued liabilities
Stockholders' Equity Attributable to Parent [Abstract]
Equity:
The income tax effects of certain tax items are reflected in cost of service for the customer in which the tax benefits are realized and result in lower utiity rates. The regulatory treatment under flow-through accounting was applied for this tax benefit generated by utility costs that were previously capitalized for tax purposes in a rate case settlement and resulted in a lower rate increase. A regulatory asset was established to reflect the future increase in taxes payable recovered from sutomers as the temporarty difference reverses.[Member]
Flow Through Accounting [Member]
Deferred taxes on flow through accounting
Treasury Stock [Member]
Treasury Stock
Segments [Axis]
Segments [Axis]
Revenues [Abstract]
Revenue:
Consolidated Indebtedness to Capitalization Ratio
Debt Instrument Consolidated Indebtedness To Capitalization Ratio Requirement
Debt instrument consolidated indebtedness to capitalization ratio requirement.
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value
Forfeited (usd per share)
Increase (Decrease) in Other Regulatory Assets
Regulatory assets
Regulatory assets
Award Type [Axis]
Award Type [Axis]
South Dakota Electric
South Dakota Electric [Member]
Black Hills Energy - South Dakota Electric
South Dakota Electric
Other Noncash Income (Expense)
Other Noncash Income (Expense), Total
Other adjustments, net
Subsequent Event [Member]
Subsequent Event
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount
Unrecognized compensation expense
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total
Retirement Plan Name [Domain]
Defined Contribution Plan
Other income, net
Other Nonoperating Income (Expense)
Other Nonoperating Income (Expense), Total
Removal Costs [Member]
Cost of removal
2023
Current maturities of long-term debt
Long-Term Debt, Current Maturities, Total
Less current maturities
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets
Defined Benefit Plan, Alternative Investments, Fair Value Of Plan Assets
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Attributable to Parent [Member]
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost
Defined Benefit Plan, Expected Future Benefit Payment, Year Two
2024
Commitments Contingencies and Guarantees [Text Block]
Commitments, Contingencies and Guarantees
Nonoperating Income (Expense) [Abstract]
Other income (expense):
Payment for Other Postretirement Benefits
Payment for Pension and Other Postretirement Benefits
Regulatory Agency [Axis]
Regulatory Agency [Axis]
Cash and Cash Equivalents [Member]
Cash
Entity Central Index Key
Entity Central Index Key
Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value investments
Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value investments
Defined Benefit Plan, Fair Value of Plan Assets, Excluding Net Asset Value investments
Customer [Axis]
Customer [Axis]
Stockholders' Equity, Other
Other
Schedule of Variable Interest Entities [Table Text Block]
Schedule of Variable Interest Entities
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total
Less accumulated depreciation and depletion
Property, Plant and Equipment [Table]
Property, Plant and Equipment [Table]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Black Hills Corporation’s common stock volatility
Position [Axis]
Hedging Designation [Domain]
Hedging Designation [Domain]
Investment [Table Text Block]
Investments
Public Utilities, Property, Plant and Equipment, Distribution
Distribution
Retail - Electric , Natural Gas and Coal
Retail - Electric , Natural Gas and Coal [Member]
Retail - Electric , Natural Gas and Coal
Measurement Frequency [Axis]
Measurement Frequency [Axis]
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]
Dilutive effect of:
Unrecorded Unconditional Purchase Obligations Disclosure [Table Text Block]
Unrecorded Unconditional Purchase Obligations Disclosure
Consolidation Items [Domain]
Consolidation Items [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant
Shares available for grant
Share-Based Payment Arrangement [Text Block]
Share-based Compensation Plans
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset, Total
Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset
Public Utilities, Term Extension of System Safety and Integrity Rider
Public Utilities, Term Extension of System Safety and Integrity Rider
Public Utilities, Term Extension of System Safety and Integrity Rider
Subsequent Event [Table]
Subsequent Event [Table]
Amortization of Debt Issuance Costs and Discounts
Deferred financing cost amortization
Amortization of Debt Issuance Costs and Discounts, Total
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]
Inventory, Raw Materials and Supplies, Gross
Materials and supplies
Inventory, Raw Materials and Supplies, Gross, Total
Less unamortized deferred financing costs
Debt Issuance Costs, Net
Debt Issuance Costs, Net, Total
Adjustments to reconcile net income to net cash provided by operating activities:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Retained Earnings [Member]
Retained Earnings
Accounts Receivable, Allowance for Credit Loss, Writeoff
Write-offs and Other Deductions
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate (comprised percent of implied volatility)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate (comprised percent of implied volatility)
Volatility Rate - Implied
Available capacity
Available Borrowing Capacity
Available borrowing capacity.
Regulatory Asset
Regulatory assets
Regulatory assets
Recovery of incremental costs
Customer [Domain]
Customer [Domain]
Designated as Hedging Instrument [Member]
Designated as Hedging Instrument
Public Utilities, Property, Plant and Equipment, Other Property, Plant and Equipment
General
Effective Tax Rate
Effective Income Tax Rate Reconciliation, Percent
Effective Income Tax Rate Reconciliation, Percent, Total
A P S C Aauthorized.
A P S C Authorized Member
Settlement agreement reached with APSC Staff and various intervenors
Property, Plant and Equipment, Gross
Property, Plant and Equipment, Gross, Ending Balance
Property, Plant and Equipment, Gross, Beginning Balance
Total gross property, plant and equipment
Property, Plant and Equipment, Gross, Total
Property, plant and equipment
Financing Receivable, Current, Allowance for Credit Loss
Financing Receivable, Current, Allowance for Credit Loss [Table Text Block]
Financing Receivable, Current, Allowance for Credit Loss
Line item in the statement of financial position in a classified presentation in which the fair value amounts of the derivative instruments are included.
Derivative Assets, Current [Member]
Derivative assets, current
Additional Paid in Capital
Additional paid-in capital
Additional Paid in Capital, Total
Entity Interactive Data Current
Entity Interactive Data Current
Public Utilities, Property, Plant and Equipment, Amount of Acquisition Adjustments
Plant acquisition adjustment
Letters of Credit
Letters of Credit Outstanding, Amount
Intersegment Eliminations [Member]
Intercompany Eliminations
Black Hills Energy, Colorado Gas [Member]
Black Hills Energy, Colorado Gas [Member]
Black Hills Energy - Colorado Gas
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Share-Based Liabilities Paid
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Share-based Liabilities Paid
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Reclassification out of Accumulated Other Comprehensive Income [Domain]
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-Term Rate of Return on Plan Assets
Expected long-term rate of return on assets
Reclassification adjustments of benefit plan liability - net loss (net of tax of $(16) and $(45), respectively)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax
Reclassification adjustment of benefit plan liability - net loss (net of tax of $(226), $(665) and $(958), respectively)
Weighted average fair value at grant date for non-vested equity-based awards issued during the period.
Weighted Average Grant Date of Fair Value Share-Based Compensation Arrangement
Weighted Average Grant Date Fair Value (usd per share)
Percentage of shares that may be redeemed at the end of each month.
Percentage Of Monthly Redemption
Percentage Of Monthly Redemption
Interest Costs Incurred
Interest expense
Interest Costs Incurred, Total
Interest expense incurred net of amounts capitalized (including amortization of debt issuance costs, premiums and discounts)
Accounts Receivable, Credit Loss Expense (Reversal)
Additions Charged to Costs and Expenses
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs
Issuance costs
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments
Deferred energy and gas costs.
Deferred Energy and Gas Costs Member
Deferred energy and gas costs
Local Phone Number
Local Phone Number
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent
U.S. federal corporate tax rate
Federal Statutory Rate
The equity award components for Performance Shares [Member]
Performance Shares, Equity Awards [Member]
Performance Shares, Equity Awards
Schedule of Earnings Per Share Reconciliation
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period
Award vesting period
Debt Disclosure [Abstract]
Debt Covenants [Abstract]
Net Income (Loss) Attributable to Noncontrolling Interest
Net Income (Loss) Attributable to Noncontrolling Interest, Total
Less: comprehensive income attributable to non-controlling interest
Net income attributable to non-controlling interest
[Domain] for Netting Contract by Category [Axis]
Netting Contract, Category [Domain]
Netting Contract by Category [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interest Rate Swap [Member]
Interest Rate Swap
Interest rate swaps
Disclosure of proportionate interests in jointly owned facilities (regulated utiliyt and non-regulated). Includes the amount of plants in service, the accumulated depreciation (if available), the amount of construction in progress, and the proportionate share. Includes statements that the amounts represent the company's share in each joint facility and that it must provide its own financing. States that the company's share of direct expenses of the joint facilities is included in the corresponding operating expenses on its income statement (for example, fuel, maintenance, other operating expense). [Text Block]
Jointly Owned Facilities, Utility and Non-Regulated [Text Block]
Jointly Owned Facilities
Disaggregation of Revenue [Table Text Block]
Disaggregation of Revenue
Annual Revenue Requirement, as Required by the FERC Joint-Access Transmission Tariff
Annual Revenue Requirement, as Required by the FERC Joint-Access Transmission Tariff
Annual Revenue Requirement, as Required by the FERC Joint-Access Transmission Tariff
Category of Item Purchased [Axis]
Category of Item Purchased [Axis]
Integrated Generation
Integrated Generation [Member]
Integrated Generation
Other Liabilities, Noncurrent
Other deferred credits and other liabilities
Defined Benefit Plan, Expected Future Benefit Payment, Year Five
2027
Net (payments) borrowings of Revolving Credit Facility and Commercial Paper Program
Net (payments) borrowings of Revolving Credit Facility and Commercial Paper Program
Net borrowings (payments) of Revolving Credit Facility and CP Program
Derivative Liability, Statement of Financial Position [Extensible Enumeration]
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax
(Tax) benefit on net unrealized gains (losses) on commodity derivatives
Income Statement Location [Domain]
Income Statement Location [Domain]
Jointly Owned Utility Plant, Ownership Amount of Plant Accumulated Depreciation
Less Accumulated Depreciation
Other Assets, Noncurrent [Abstract]
Other assets:
Asset Retirement Obligation
Ending Balance
Beginning Balance
Asset Retirement Obligation, Total
Property, Plant and Equipment [Abstract]
Property, Plant and Equipment [Abstract]
Commodity Option [Member]
Natural gas options purchased, net
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Ending Balance
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number, Beginning Balance
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Accrued Liabilities - Customer Deposits and Prepayments
Customer Deposits and Prepayments
Customer deposits and prepayments
Long-Term Debt
Long-term Debt
Long-Term Debt, Total
Total
Liability, Defined Benefit Plan, Noncurrent
Benefit plan liabilities
Liability, Defined Benefit Plan, Noncurrent, Total
Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Document Fiscal Year Focus
Document Fiscal Year Focus
Intangible Assets, Net (Excluding Goodwill)
Intangible assets, net, ending balance
Intangible assets, net, beginning balance
Intangible assets, net
Intangible Assets, Net (Excluding Goodwill), Total
Earnings Per Share, Basic
Earnings per share, Basic (usd per share)
Earnings Per Share, Basic, Total
Dividends, Common Stock, Cash
Dividends on common stock
Assets [Abstract]
ASSETS
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum
Volatility range for peer group, Minimum
Timing of Transfer of Good or Service [Domain]
Timing of Transfer of Good or Service [Domain]
Schedule of Long-Term Debt Instruments [Table Text Block]
Schedule of Long-term Debt Instruments
Treasury stock, at cost - 41,114 and 36,726 shares, respectively
Treasury Stock, Value
Treasury Stock, Value, Total
Share-Based Payment Arrangement [Member]
Equity Compensation
The liability components of equity Performance Shares awards [Member]
Performance Shares, Liability Awards [Member]
Performance Shares, Liability Awards
Long-Lived Tangible Asset [Axis]
Property, Plant and Equipment, Type [Axis]
Liabilities and Equity [Abstract]
LIABILITIES AND EQUITY
Position [Domain]
Income Taxes Paid, Net
Income Taxes Paid, Net, Total
Income taxes
Public Utilities, Approved Debt Capital Structure, Percentage
Public Utilities, Approved Debt Capital Structure, Percentage
Asset Retirement Obligation, Accretion Expense
Accretion
Antidilutive Securities, Name [Domain]
Antidilutive Securities, Name [Domain]
Accumulated Defined Benefit Plans Adjustment, Net Gain (Loss) Attributable to Parent [Member]
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss)
Wyodak Plant - power generation plant owned 20% by Black Hills Power and 80% by Pacificorp[Member]
Wyodak Plant [Member]
Wyodak Plant
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Net income
Net income
Net income
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information, Additional Information [Abstract]
Assets, Current [Abstract]
Current assets:
Cushion Gas - Depreciable [Member]
Cushion Gas - Depreciable [Member]
Cushion gas - depreciable
Taxes, Miscellaneous
Taxes - property and production
Taxes, Miscellaneous, Total
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax
Other comprehensive income (loss), before reclassifications
Segment Reporting Disclosure [Text Block]
Business Segment Information
Public Utilities, Approved Equity Capital Structure, Percentage
Public Utilities, Approved Equity Capital Structure, Percentage
Schedule of Goodwill [Table Text Block]
Goodwill
Fair Value Hierarchy and NAV [Domain]
Fair Value, Measurements, Fair Value Hierarchy [Domain]
Black Hills Corporation [Member]
Black Hills Corporation [Member]
Black Hills Corporation
Defined Contribution Plan, Employer Discretionary Contribution Amount
Defined Contribution Plan, Employer Discretionary Contribution Amount
Measurement Frequency [Domain]
Measurement Frequency [Domain]
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Contract or notional amounts and terms of marketing activities and derivative commodity instruments
Increase (Decrease) in Operating Capital [Abstract]
Change in certain operating assets and liabilities:
Jointly Owned Utility Plant [Domain]
Jointly Owned Utility Plant [Domain]
Nebraska Public Service Commission (NPSC) [Member]
Nebraska Public Service Commission (NPSC) [Member]
Nebraska Public Service Commission (NPSC)
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year
Post-65 for next year - All Plans
Entity [Domain]
Entity [Domain]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest
Income before income taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest, Total
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Defined Benefit Plan, Plan Assets, Contributions by Employer
Employer contributions
Payment for Pension Benefits
Long-term Purchase Power Contract with MEAN
Purchase Power Contract, MEAN [Member]
Purchase Power Contract, MEAN, for up to 20 Megawatts
Purchase Power Contract, MEAN
Cover [Abstract]
Supply Commitment Arrangement [Domain]
Supply Commitment Arrangement [Domain]
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate
Blended volatility
Product and Service [Domain]
Product and Service [Domain]
Transferred over Time [Member]
Services transferred over time
Measurement Basis [Axis]
Measurement Basis [Axis]
Rate Action of a regulator resulting in return of prior period income tax over collections
Deferred Income Tax Amortization [Member]
Excess deferred income taxes
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period
Shares Vested
Property Plant Equipment excluding Construction in Progress
Property Plant Equipment Excluding Construction In Progress
Property, Plant and Equipment
Estimated Future Employer Contributions in Current Fiscal Year
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year
Asset Retirement Obligation Disclosure [Abstract]
Asset Retirement Obligation Disclosure [Abstract]
Liabilities, Current [Abstract]
Current liabilities:
Maximum [Member]
Maximum
Storm Costs [Member]
Storm Costs
Retirement Plan Name [Axis]
Retirement Plan Name [Axis]
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
Share-based Payment Arrangement, Expensed Amount
Wyoming Public Service Commission
Wyoming Public Service Commission [Member]
Wyoming Public Service Commission
Net Cash Provided by (Used in) Investing Activities
Net cash (used in) investing activities
Fixed for Float Swaps Purchased [Member]
Fixed for Float Swaps Purchased [Member]
Natural gas over-the-counter swaps, net
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table]
Asset Retirement Obligation, Liabilities Incurred
Liabilities Incurred
Long-Term Purchase Commitment [Table]
Long-term Purchase Commitment [Table]
Schedule of Inventory, Current [Table Text Block]
Materials, Supplies and Fuel
Power Purchased [Member]
Power Purchased [Member]
Power purchased
Fair Value, Inputs, Level 3 [Member]
Fair Value, Inputs, Level 3
Employee Benefit Plans And Related Deferred Taxes Assets [Member]
Employee Benefit Plans And Related Deferred Taxes Assets [Member]
Employee benefit plans and related deferred taxes
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Defined Benefit Plans Adjustment
Use of Estimates, Policy [Policy Text Block]
Use of Estimates and Basis of Presentation
Derivative Liability, Subject to Master Netting Arrangement, before Offset
Derivative Liability, Fair Value, Gross Liability
Derivative Liability, Fair Value, Gross Liability
Long-Term Purchase Commitment, Period
Long-term Purchase Commitment, Period
Derivative, Loss, Statement of Income or Comprehensive Income [Extensible Enumeration]
Regulatory Asset, Amortization Period
Regulatory Asset, Amortization Period
Regulatory Asset, Current
Regulatory assets, current
Regulatory assets, current
Property, Plant and Equipment, Useful Life
Weighted average useful life
Benefit from Relieved TCJA Related Liabilities
Benefit from Relieved TCJA Related Liabilities
Benefit from Relieved TCJA Related Liabilities
Common Stock, Shares Authorized
Common stock, shares authorized
Short-Term Debt, Type [Domain]
Short-term Debt, Type [Domain]
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Post-65 Ultimate trend rate - Black Hills Corp
Trading Symbol
Trading Symbol
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
Reclassification out of Accumulated Other Comprehensive Income
Interest Expense [Member]
Interest Expense
Schedule of Employer Contribution to Defined Benefit and Defined Contribution Plans [Table Text Block]
Schedule of Employer Contribution to Employee Benefit Plans [Table Text Block]
Schedule of Employer Contribution to Employee Benefit Plans
Subsequent Event Type [Axis]
Subsequent Event Type [Axis]
Performance Shares [Member]
Performance Shares
Balance Sheet Location [Axis]
Balance Sheet Location [Axis]
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually
Settlement of Plan to Provide TCJA and State Tax Reform benefits to Customers Annually
Comprehensive Income (Loss), Net of Tax, Attributable to Parent
Comprehensive income available for common stock
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion
Derivative Instruments, Loss Reclassified from Accumulated OCI into Income, Effective Portion
Average amount outstanding (based on daily outstanding balances)
Line of Credit Facility, Average Outstanding Amount
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Three-year risk-free rate
Accounts Payable, Current
Accounts payable
Accounts Payable, Current, Total
Plan Name [Axis]
Plan Name [Axis]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Cash Flow Hedging [Member]
Cash Flow Hedging
Long-Lived Tangible Asset [Domain]
Property, Plant and Equipment, Type [Domain]
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Distributions to non-controlling interest
Debt Instrument, Term
Common Stock, Par or Stated Value Per Share
Common stock, par value (usd per share)
Jointly Owned Utility Plant, Net Ownership Amount
Plant Net of Accumulated Depreciation
Jointly Owned Utility Plant, Net Ownership Amount, Total
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period
Performance Shares, Granted in Period
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Derivative Instrument [Axis]
Property, Plant and Equipment Disclosure [Text Block]
Property, Plant and Equipment
Estimate of Fair Value Measurement [Member]
Fair Value
Fair Value
Debt Instrument [Line Items]
Debt Instrument [Line Items]
Long-Term Debt, Type [Domain]
Anti-dilutive shares (in shares)
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount
Black Hills Energy - Nebraska Gas [Member]
Black Hills Energy - Nebraska Gas [Member]
Black Hills Energy - Nebraska Gas
Defined Benefit Plan, Expected Return (Loss) on Plan Assets
Expected return on assets