XML 49 R38.htm IDEA: XBRL DOCUMENT v3.23.3

Regulatory Matters: Gas Utilities Regulatory Activity (Details) $ in Millions	Oct. 13, 2023 USD ($) mi	Jul. 12, 2023 USD ($)	May 09, 2023 USD ($) mi	Jan. 26, 2023 USD ($)	Jun. 01, 2022 mi
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Colorado Gas | Rate Review Filed with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi			10,000
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 27.0
Public utilities, requested equity capital structure, percentage			51.00%
Public utilities, requested debt capital structure, percentage			49.00%
Public Utilities, Requested Return on Equity, Percentage			10.49%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Weighted average cost of capital		6.93%
Public Utilities Amount of System Safety and Integrity Rider Moved to Base Rates and Termination of the System Safety and Integrity Rider		$ 8.3
Public Utilities, Approved Rate Increase (Decrease), Amount		$ 8.2
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Minimum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage		50.00%
Public Utilities, Approved Debt Capital Structure, Percentage		50.00%
Public Utilities, Approved Return on Equity, Percentage		9.50%
Colorado Public Utilities Commission (CPUC) | Black Hills Energy - Rocky Mountain Natural Gas | Settlement Reached with the Regulatory Agency | Maximum
Public Utilities, General Disclosures [Line Items]
Public Utilities, Approved Equity Capital Structure, Percentage		52.00%
Public Utilities, Approved Debt Capital Structure, Percentage		48.00%
Public Utilities, Approved Return on Equity, Percentage		9.70%
Wyoming Public Service Commission | Wyoming Electric | Settlement Reached with the Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments | mi					1,330
Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments | mi					59
Public Utilities, Approved Equity Capital Structure, Percentage				52.00%
Public Utilities, Approved Debt Capital Structure, Percentage				48.00%
Public Utilities, Approved Return on Equity, Percentage				9.75%
Public Utilities, Approved Rate Increase (Decrease), Amount				$ 8.7
Subsequent Event | Wyoming Public Service Commission | Black Hills Energy - Wyoming Gas | Settlement Agreement Filed with Regulatory Agency
Public Utilities, General Disclosures [Line Items]
Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments | mi	6,400
Public utilities, requested equity capital structure, percentage	51.00%
Public utilities, requested debt capital structure, percentage	49.00%
Public Utilities, Requested Return on Equity, Percentage	9.85%
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 13.9
Extension period as per settlement agreement	4 years

X

- Definition

Extension period.

+ References

No definition available.

+ Details

Name:	bkh_ExtensionPeriod
Namespace Prefix:	bkh_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Public utilities amount of system safety and integrity rider moved to base rates and termination of the system safety and integrity rider.

+ References

No definition available.

+ Details

Name:	bkh_PublicUtilitiesAmountOfSystemSafetyAndIntegrityRiderMovedToBaseRatesAndTerminationOfTheSystemSafetyAndIntegrityRider
Namespace Prefix:	bkh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Public Utilities - Length of Electric Distribution Lines to Receive Infrastructure Investments

+ References

No definition available.

+ Details

Name:	bkh_PublicUtilitiesLengthOfElectricDistributionLinesToReceiveInfrastructureInvestments
Namespace Prefix:	bkh_
Data Type:	dtr-types:lengthItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities - Length of Electric Transmission Lines to Receive Infrastructure Investments

+ References

No definition available.

+ Details

Name:	bkh_PublicUtilitiesLengthOfElectricTransmissionLinesToReceiveInfrastructureInvestments
Namespace Prefix:	bkh_
Data Type:	dtr-types:lengthItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Public Utilities - Length of Natural Gas Pipeline to Receive Infrastructure Investments

+ References

No definition available.

+ Details

Name:	bkh_PublicUtilitiesLengthOfNaturalGasPipelineToReceiveInfrastructureInvestments
Namespace Prefix:	bkh_
Data Type:	dtr-types:lengthItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted Average Cost of Capital

+ References

No definition available.

+ Details

Name:	bkh_WeightedAverageCostOfCapital
Namespace Prefix:	bkh_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's approved debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's approved equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of public utility's approved rate increase (decrease) by regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of public utility's approved return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesApprovedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesGeneralDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's requested debt to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedDebtCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of public utility's requested equity to capital, including debt and equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedEquityCapitalStructurePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of public utility's requested rate increase (decrease) with regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedRateIncreaseDecreaseAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of public utility's requested return on equity.

+ References

No definition available.

+ Details

Name:	us-gaap_PublicUtilitiesRequestedReturnOnEquityPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_RegulatoryAgencyAxis=bkh_ColoradoPublicUtilitiesCommissionCPUCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=bkh_BlackHillsEnergyColoradoGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=bkh_RateReviewFiledwiththeRegulatoryAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=bkh_BlackHillsEnergyRockyMountainNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=bkh_SettlementReachedWithTheRegulatoryAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RegulatoryAgencyAxis=bkh_WyomingPublicServiceCommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=bkh_WyomingElectricMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=bkh_BlackHillsEnergyWyomingGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PublicUtilitiesRegulatoryProceedingAxis=bkh_SettlementAgreementFiledWithRegulatoryAgencyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: