Fundies. English
Segment disclosures
Company overviewBlack Hills Corporation
Each reported dimension combination stays separate. Revenue and operating income are shown as reported, with their dates and sources.
Revenue · Reported segment facts
91 dimension combinations 776 retained observations 16 reported periods Partial retained history
Counts describe retained dimensioned rows only. Periods and members can change across reports, and this view does not infer missing values or expected segment totals.
Operating Segments · External Customers · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 234490000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 640595000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 255741000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 660800000 | USD | 20231102 | Open filing evidence |
Operating Segments · External Customers · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 172636000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1098973000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 206871000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1099577000 | USD | 20231102 | Open filing evidence |
Operating Segments · External Revenues · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:ExternalRevenuesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-06-30 | 707600000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 507100000 | USD | 20240509 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 172600000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1099000000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 221100000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 926300000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 705300000 | USD | 20240509 | Open filing evidence |
Operating Segments · Intercompany Customers · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 2839000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 8516000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 2928000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 8786000 | USD | 20231102 | Open filing evidence |
Operating Segments · Intercompany Customers · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 1649000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 4948000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 1417000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 4272000 | USD | 20231102 | Open filing evidence |
Operating Segments · Inter Segment Revenues · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:InterSegmentRevenuesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-06-30 | 2900000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 6000000 | USD | 20260211 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 4500000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1500000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3000000 | USD | 20260806 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 6100000 | USD | 20250212 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 1600000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4600000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1500000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 1600000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 6500000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1700000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 4900000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 1600000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1600000 | USD | 20240509 | Open filing evidence |
Operating Segments · Market Off System Sales · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 12999000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 37487000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 16770000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 32590000 | USD | 20231102 | Open filing evidence |
Operating Segments · Market Off System Sales · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 200000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 100000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 100000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 0 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 400000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 400000 Restated | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 300000 | USD | 20240801 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 800000 | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 186000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 602000 | USD | 20231102 | Open filing evidence |
Operating Segments · Retail Electric Natural Gasand Coal · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:RetailElectricNaturalGasandCoalMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 191029000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 522304000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 211489000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 553327000 | USD | 20231102 | Open filing evidence |
Operating Segments · Retail Electric Natural Gasand Coal · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:RetailElectricNaturalGasandCoalMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 165000000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 623800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 458700000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1124900000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 128600000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 797000000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 168500000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 668300000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 499700000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1022600000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 117500000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 707800000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 152900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 590300000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 437400000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1248800000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 120800000 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 931100000 Restated | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 174800000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 810300000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 635500000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1453300000 | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 157203000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 947290000 | USD | 20231102 | Open filing evidence |
Operating Segments · Transmission · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransmissionMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 200000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 400000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 200000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 600000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 100000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 300000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 300000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 200000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 700000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 400000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 100000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 400000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 300000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 700000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 800000 | USD | 20250212 | Open filing evidence |
Operating Segments · Transmission Other · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransmissionOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 18092000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 54727000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 15919000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 46535000 | USD | 20231102 | Open filing evidence |
Operating Segments · Transmission Other · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransmissionOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 9607000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 28833000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 8875000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 27794000 | USD | 20231102 | Open filing evidence |
Operating Segments · Transportation · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransportationMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
Operating Segments · Transportation · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransportationMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 44800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 99300000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 54500000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 194400000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 43600000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 143400000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 42100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 99800000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 57700000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 178200000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 43200000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 130900000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 36000000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 87600000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 51700000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 176800000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 42700000 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 131400000 Restated | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 35900000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 88800000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 52800000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 173300000 | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 41006000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 125196000 | USD | 20231102 | Open filing evidence |
Operating Segments · Wholesale · Electric Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 9441000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 24578000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 13667000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 32370000 | USD | 20231102 | Open filing evidence |
Operating Segments · Wholesale · Gas Utilities
Consolidation Items · Major Customers · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 0 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
Operating Segments · Alternative Revenue And Other · Gas Utilities
Consolidation Items · Product Or Service · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=bkh:AlternativeRevenueAndOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 10100000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 29800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 17800000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 19500000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1900000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 7600000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2000000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 5700000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 3700000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 24700000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 2100000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 13500000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 3100000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 11500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 8400000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 18800000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 3800000 | USD | 20250212 | Open filing evidence |
Operating Segments · Electric Utilities
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 237329000 Restated | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 649111000 Restated | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 258669000 Restated | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 669586000 Restated | USD | 20231102 | Open filing evidence |
Operating Segments · Electric Utilities · Transferred At Point In Time
Consolidation Items · Statement Business Segments · Timing Of Transfer Of Good Or Service
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 7843000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 24344000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 7928000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 21712000 | USD | 20231102 | Open filing evidence |
Operating Segments · Gas Utilities
Consolidation Items · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 230500000 Restated | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 773600000 Restated | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 543100000 Restated | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1382800000 Restated | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 184400000 Restated | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 979900000 Restated | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 223000000 Restated | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 795400000 Restated | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 572400000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1269400000 Restated | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 173600000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 884200000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 202000000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 710600000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 508700000 Restated | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1484200000 Restated | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 173100000 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1091700000 Restated | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 219900000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 918600000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 698700000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1669100000 Restated | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 208288000 Restated | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1103849000 Restated | USD | 20231102 | Open filing evidence |
Operating Segments · Gas Utilities · Intercompany Customers
Consolidation Items · Statement Business Segments · Major Customers
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-12-31 | 6500000 | USD | 20240214 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5700000 | USD | 20240214 | Open filing evidence |
Operating Segments · Gas Utilities · Market Off System Sales
Consolidation Items · Statement Business Segments · Major Customers
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 0 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 400000 | USD | 20240214 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 300000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 800000 | USD | 20240214 | Open filing evidence |
Operating Segments · Gas Utilities · Other
Consolidation Items · Statement Business Segments · Product Or Service
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;srt:ProductOrServiceAxis=bkh:OtherMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 8400000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 18800000 | USD | 20240214 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 8200000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 3800000 | USD | 20240214 | Open filing evidence |
Operating Segments · Gas Utilities · Transferred At Point In Time
Consolidation Items · Statement Business Segments · Timing Of Transfer Of Good Or Service
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 0 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20240214 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20240214 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 0 | USD | 20231102 | Open filing evidence |
Operating Segments · Gas Utilities · Transferred Over Time
Consolidation Items · Statement Business Segments · Timing Of Transfer Of Good Or Service
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 500300000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1465400000 | USD | 20240214 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 698700000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1665300000 | USD | 20240214 | Open filing evidence |
Operating Segments · Transferred At Point In Time · Gas Utilities
Consolidation Items · Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-09-30 | 0 | USD | 20231102 | Open filing evidence |
Operating Segments · Transferred Over Time · Electric Utilities
Consolidation Items · Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 223718000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 614752000 | USD | 20231102 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 249917000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 643110000 | USD | 20231102 | Open filing evidence |
Operating Segments · Transferred Over Time · Gas Utilities
Consolidation Items · Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-06-30 | 743800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 525300000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 972300000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 221000000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 789700000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 568700000 | USD | 20250508 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1244700000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 870700000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 198900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 699100000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1465400000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 173100000 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 1091700000 Restated | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 219900000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 918600000 | USD | 20240801 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1665300000 | USD | 20250212 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 207270000 | USD | 20231102 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1100882000 | USD | 20231102 | Open filing evidence |
External Customers · Operating Segments · Gas Utilities
Major Customers · Consolidation Items · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 229000000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 770700000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 541600000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1376800000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 182900000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 975400000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 221500000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 792400000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 570900000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1263300000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 172000000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 879600000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 200500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 707600000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 507100000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 1477700000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1663400000 | USD | 20250212 | Open filing evidence |
External Customers · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 190212000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 406105000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 215012000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 888447000 Restated | USD | 20230214 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 254917000 | USD | 20221103 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 656036000 | USD | 20221103 | Open filing evidence |
External Customers · Electric Utilities · Operating Segments
Major Customers · Statement Business Segments · Consolidation Items
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 223800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 462800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 239100000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 933200000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 247300000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 699100000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 217500000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 451800000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 234300000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 864400000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 229600000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 651000000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 202100000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 421400000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 219300000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 853600000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 888400000 | USD | 20250212 | Open filing evidence |
External Customers · Electric Utilities · Other
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ProductOrServiceAxis=bkh:OtherMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-07-01 – 2022-09-30 | 824000 | USD | 20221103 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 4764000 | USD | 20221103 | Open filing evidence |
External Customers · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 221071000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 926337000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 697043000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1663369000 Restated | USD | 20230214 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 205951000 | USD | 20221103 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 1096925000 | USD | 20221103 | Open filing evidence |
External Customers · Gas Utilities · Other
Major Customers · Statement Business Segments · Product Or Service
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;srt:ProductOrServiceAxis=bkh:OtherMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2022-07-01 – 2022-09-30 | 920000 | USD | 20221103 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 2652000 | USD | 20221103 | Open filing evidence |
External Customers · Reportable Segment Aggregation Before Other Operating Segment
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=us-gaap:ReportableSegmentAggregationBeforeOtherOperatingSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 2310000000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 2127700000 | USD | 20260211 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 2331300000 | USD | 20260211 | Open filing evidence |
External Revenues · Operating Segments · Gas Utilities
Major Customers · Consolidation Items · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:ExternalRevenuesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 172000000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 879600000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 200500000 | USD | 20240801 | Open filing evidence |
Intercompany Customers · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 2861000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 5677000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 2816000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 11715000 | USD | 20230214 | Open filing evidence |
| 2022-07-01 – 2022-09-30 | 2928000 | USD | 20221103 | Open filing evidence |
| 2022-01-01 – 2022-09-30 | 8786000 | USD | 20221103 | Open filing evidence |
Intercompany Customers · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 1649000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 3299000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 1650000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5721000 Restated | USD | 20230214 | Open filing evidence |
Inter Segment Revenues · Operating Segments · Gas Utilities
Major Customers · Consolidation Items · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:InterSegmentRevenuesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 1500000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 1500000 | USD | 20260507 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 1500000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1500000 | USD | 20250731 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 3000000 | USD | 20250731 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 1500000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 6100000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4600000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 1500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3000000 | USD | 20250731 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 3300000 | USD | 20240801 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5700000 | USD | 20250212 | Open filing evidence |
Market Off System Sales · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 8364000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 24488000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 16124000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 48578000 | USD | 20230214 | Open filing evidence |
Market Off System Sales · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 43000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 324000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 281000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 829000 | USD | 20230214 | Open filing evidence |
Other · Operating Segments · Gas Utilities
Major Customers · Consolidation Items · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:OtherMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 10400000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 20300000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 11900000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 43200000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 10200000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 31500000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10200000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 21200000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 11100000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 43100000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 10800000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 31600000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 9900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 20800000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 10900000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 38700000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 37100000 | USD | 20250212 | Open filing evidence |
Other · Electric Utilities · Operating Segments
Major Customers · Statement Business Segments · Consolidation Items
Source dimensions
srt:MajorCustomersAxis=bkh:OtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 14500000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 29100000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 14800000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 59300000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 14600000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 43900000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 15600000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 29400000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 13800000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 58700000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 14900000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 43300000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 14400000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 28500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 14000000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 55900000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 51500000 | USD | 20250212 | Open filing evidence |
Retail Electric Natural Gasand Coal · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:RetailElectricNaturalGasandCoalMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 156372000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 331275000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 174903000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 739734000 | USD | 20230214 | Open filing evidence |
Retail Electric Natural Gasand Coal · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:RetailElectricNaturalGasandCoalMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 174781000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 810326000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 635545000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1453266000 | USD | 20230214 | Open filing evidence |
Transmission Other · Operating Segments · Gas Utilities
Major Customers · Consolidation Items · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:TransmissionOtherMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 10900000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 32100000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 10000000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 21100000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 11200000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 39400000 | USD | 20240214 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 9600000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 28800000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 9200000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 19200000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 10100000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 37900000 | USD | 20240214 | Open filing evidence |
Transmission Other · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:TransmissionOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 19231000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 36635000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 17404000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 61470000 | USD | 20230214 | Open filing evidence |
Transmission Other · Electric Utilities · Operating Segments
Major Customers · Statement Business Segments · Consolidation Items
Source dimensions
srt:MajorCustomersAxis=bkh:TransmissionOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 19100000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 56600000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 19400000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 37500000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 18000000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 71400000 | USD | 20240214 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 18100000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 54700000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 19200000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 36600000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 17400000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 61500000 | USD | 20240214 | Open filing evidence |
Transmission Other · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:TransmissionOtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 9203000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 19226000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 10023000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 37879000 | USD | 20230214 | Open filing evidence |
Transportation · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:TransportationMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20230214 | Open filing evidence |
Transportation · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:TransportationMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 35913000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 88756000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 52843000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 173275000 | USD | 20230214 | Open filing evidence |
Wholesale · Electric Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 5739000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 15137000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 9398000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 44832000 | USD | 20230214 | Open filing evidence |
Wholesale · Gas Utilities
Major Customers · Statement Business Segments
Source dimensions
srt:MajorCustomersAxis=bkh:WholesaleMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20230214 | Open filing evidence |
Other · Operating Segments · Electric Utilities
Product Or Service · Consolidation Items · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-07-01 – 2023-09-30 | 5768000 | USD | 20231102 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 10015000 | USD | 20231102 | Open filing evidence |
Other · Operating Segments · Gas Utilities
Product Or Service · Consolidation Items · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 2100000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 13500000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 3100000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 11500000 | USD | 20240801 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 1200000 Restated | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 12200000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 2800000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 11000000 | USD | 20240801 | Open filing evidence |
Other · External Customers · Electric Utilities
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-03-31 | 881000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5548000 | USD | 20230214 | Open filing evidence |
Other · External Customers · Gas Utilities
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:MajorCustomersAxis=bkh:ExternalCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-03-31 | 8223000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 3412000 | USD | 20230214 | Open filing evidence |
Other · Intercompany Customers · Electric Utilities
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-03-31 | 0 | USD | 20230504 | Open filing evidence |
Other · Intercompany Customers · Gas Utilities
Product Or Service · Major Customers · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-03-31 | 0 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 429000 | USD | 20230214 | Open filing evidence |
Other · Electric Utilities
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 3367000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 4247000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 880000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5548000 | USD | 20230214 | Open filing evidence |
Other · Electric Utilities · Operating Segments
Product Or Service · Statement Business Segments · Consolidation Items
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 900000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4100000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2400000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3200000 | USD | 20240801 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 5800000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 10000000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 3400000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 4300000 | USD | 20240801 | Open filing evidence |
Other · Gas Utilities
Product Or Service · Statement Business Segments
Source dimensions
srt:ProductOrServiceAxis=bkh:OtherMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 2780000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 11004000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 8224000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 3841000 | USD | 20230214 | Open filing evidence |
Electric Utilities
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 193073000 Restated | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 411782000 Restated | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 218709000 Restated | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 900162000 Restated | USD | 20230214 | Open filing evidence |
Electric Utilities · Operating Segments
Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 226300000 Restated | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 467900000 Restated | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 241600000 Restated | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 942800000 Restated | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 249700000 Restated | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 706300000 Restated | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 219900000 Restated | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 456600000 Restated | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 236700000 Restated | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 876100000 Restated | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 232500000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 659800000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 205100000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 427300000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 222200000 Restated | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 865000000 Restated | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 231500000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 639100000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 189700000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 407500000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 217800000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 900200000 Restated | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · External Revenues
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:ExternalRevenuesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-09-30 | 651000000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 421400000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 219300000 | USD | 20240509 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 234500000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 215900000 | USD | 20240509 | Open filing evidence |
Electric Utilities · Operating Segments · Intercompany Customers
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:IntercompanyCustomersMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-12-31 | 11400000 | USD | 20240214 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 11800000 | USD | 20240214 | Open filing evidence |
Electric Utilities · Operating Segments · Inter Segment Revenues
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:InterSegmentRevenuesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-03-31 | 2500000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 7200000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 2400000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4800000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 11700000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 8800000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 5900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 2900000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 11400000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 2800000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 8500000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 5700000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 2800000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 11800000 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Market Off System Sales
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:MarketOffSystemSalesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 2500000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 13400000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 10900000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 51900000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 16300000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 38300000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10700000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 22000000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 11300000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 34800000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 10700000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 22800000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 5500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 12000000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 6600000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 50900000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 13000000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 37500000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 8400000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 24500000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 16100000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 48600000 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Retail Electric Natural Gasand Coal
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:RetailElectricNaturalGasandCoalMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 184400000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 381400000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 197000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 760400000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 201300000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 570600000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 178100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 369300000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 191300000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 698600000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 186300000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 529400000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 163400000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 343000000 Restated | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 179600000 Restated | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 666100000 Restated | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 191000000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 522300000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 156400000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 331300000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 174900000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 709200000 Restated | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Transmission
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransmissionMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 17500000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 29600000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 12000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 45200000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 11100000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 33300000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 10000000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 22200000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 12100000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 52200000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 13600000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 39100000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 12900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 25600000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 12700000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 47100000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 40500000 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Transportation
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:TransportationMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 0 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Wholesale
Statement Business Segments · Consolidation Items · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:MajorCustomersAxis=bkh:WholesaleMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 5300000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 11300000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 6000000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 21700000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 5500000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 16900000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 4200000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 11300000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 7100000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 26800000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 6100000 Restated | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 21100000 Restated | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 6500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 15000000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 8500000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 34200000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 9400000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 24600000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 5700000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 15100000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 9400000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 44800000 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Alternative Revenue And Other
Statement Business Segments · Consolidation Items · Product Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=bkh:AlternativeRevenueAndOtherMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 2100000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 3100000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 900000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 4300000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 900000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 3300000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 1300000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 2400000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 1100000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 5000000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 900000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 4100000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 2400000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 3200000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 800000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 10800000 | USD | 20260211 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5600000 | USD | 20250212 | Open filing evidence |
Electric Utilities · Operating Segments · Other
Statement Business Segments · Consolidation Items · Product Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;srt:ProductOrServiceAxis=bkh:OtherMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 800000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 10800000 | USD | 20240214 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 900000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 5600000 | USD | 20240214 | Open filing evidence |
Electric Utilities · Operating Segments · Transferred At Point In Time
Statement Business Segments · Consolidation Items · Timing Of Transfer Of Good Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-01-01 – 2024-03-31 | 8700000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 31500000 | USD | 20240214 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 8700000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 30400000 | USD | 20240214 | Open filing evidence |
Electric Utilities · Operating Segments · Transferred Over Time
Statement Business Segments · Consolidation Items · Timing Of Transfer Of Good Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 216200000 | USD | 20260806 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 209500000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 437000000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 836400000 | USD | 20250212 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 222300000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 629800000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 194900000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 407600000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 212700000 | USD | 20240509 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 822700000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 223700000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 391000000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 209100000 | USD | 20240509 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 864200000 | USD | 20250212 | Open filing evidence |
Electric Utilities · External Revenues · Operating Segments
Statement Business Segments · Major Customers · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:MajorCustomersAxis=bkh:ExternalRevenuesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2024-07-01 – 2024-09-30 | 229600000 | USD | 20241107 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 202100000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 640600000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 190200000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 406100000 | USD | 20240801 | Open filing evidence |
Electric Utilities · Inter Segment Revenues · Operating Segments
Statement Business Segments · Major Customers · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:MajorCustomersAxis=bkh:InterSegmentRevenuesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 2500000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 5100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 9600000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 2400000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 4800000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 2400000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 11700000 | USD | 20250212 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 2900000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 3000000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 2900000 | USD | 20250508 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 2900000 | USD | 20240801 | Open filing evidence |
Electric Utilities · Transferred At Point In Time
Statement Business Segments · Timing Of Transfer Of Good Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 7844000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 16501000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 8657000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 30454000 | USD | 20230214 | Open filing evidence |
Electric Utilities · Transferred Over Time · Operating Segments
Statement Business Segments · Timing Of Transfer Of Good Or Service · Consolidation Items
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-01-01 – 2026-06-30 | 448000000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 231900000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 903600000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 240000000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 677100000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 437000000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 227500000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 836400000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 222300000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 629800000 | USD | 20241107 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 407600000 | USD | 20240801 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 212700000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 822700000 | USD | 20250212 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 614800000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 181900000 | USD | 20240801 | Open filing evidence |
Gas Utilities
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 222720000 Restated | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 929636000 Restated | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 706916000 Restated | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1669090000 Restated | USD | 20230214 | Open filing evidence |
Gas Utilities · Transferred At Point In Time
Statement Business Segments · Timing Of Transfer Of Good Or Service
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember;us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-01-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20230214 | Open filing evidence |
Reportable Segment Aggregation Before Other Operating Segment
Statement Business Segments
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:ReportableSegmentAggregationBeforeOtherOperatingSegmentMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 2325600000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 2145500000 | USD | 20260211 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 2349200000 | USD | 20260211 | Open filing evidence |
Reportable Segment Aggregation Before Other Operating Segment · Inter Segment Revenues
Statement Business Segments · Major Customers
Source dimensions
us-gaap:StatementBusinessSegmentsAxis=us-gaap:ReportableSegmentAggregationBeforeOtherOperatingSegmentMember;srt:MajorCustomersAxis=bkh:InterSegmentRevenuesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2025-01-01 – 2025-12-31 | 15600000 | USD | 20260211 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 17800000 | USD | 20260211 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 17900000 | USD | 20260211 | Open filing evidence |
Transferred At Point In Time · Operating Segments · Gas Utilities
Timing Of Transfer Of Good Or Service · Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 0 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 0 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 0 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 0 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 0 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 0 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 0 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 0 | USD | 20240801 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 0 | USD | 20250212 | Open filing evidence |
Transferred At Point In Time · Electric Utilities · Operating Segments
Timing Of Transfer Of Good Or Service · Statement Business Segments · Consolidation Items
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 8000000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-06-30 | 16800000 | USD | 20260806 | Open filing evidence |
| 2026-01-01 – 2026-03-31 | 8800000 | USD | 20260507 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 34900000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 8800000 | USD | 20251106 | Open filing evidence |
| 2025-01-01 – 2025-09-30 | 25900000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 9100000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 17200000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 8100000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 34700000 | USD | 20260211 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 9300000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-09-30 | 25900000 | USD | 20251106 | Open filing evidence |
| 2024-04-01 – 2024-06-30 | 7800000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 16500000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 8700000 | USD | 20250508 | Open filing evidence |
| 2023-01-01 – 2023-12-31 | 31500000 | USD | 20260211 | Open filing evidence |
| 2023-07-01 – 2023-09-30 | 7800000 | USD | 20241107 | Open filing evidence |
| 2023-01-01 – 2023-09-30 | 24300000 | USD | 20241107 | Open filing evidence |
| 2023-04-01 – 2023-06-30 | 7800000 | USD | 20240801 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 16500000 | USD | 20240801 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 30400000 | USD | 20250212 | Open filing evidence |
Transferred At Point In Time · Gas Utilities
Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredAtPointInTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 0 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 0 | USD | 20230504 | Open filing evidence |
Transferred Over Time · Operating Segments · Gas Utilities
Timing Of Transfer Of Good Or Service · Consolidation Items · Statement Business Segments
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;srt:ConsolidationItemsAxis=us-gaap:OperatingSegmentsMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2026-04-01 – 2026-06-30 | 220400000 | USD | 20260806 | Open filing evidence |
| 2025-01-01 – 2025-12-31 | 1363300000 | USD | 20260211 | Open filing evidence |
| 2025-07-01 – 2025-09-30 | 182500000 | USD | 20251106 | Open filing evidence |
| 2025-04-01 – 2025-06-30 | 221000000 | USD | 20250731 | Open filing evidence |
| 2025-01-01 – 2025-06-30 | 789700000 | USD | 20250731 | Open filing evidence |
| 2025-01-01 – 2025-03-31 | 568700000 | USD | 20260507 | Open filing evidence |
| 2024-01-01 – 2024-12-31 | 1244700000 | USD | 20250212 | Open filing evidence |
| 2024-07-01 – 2024-09-30 | 171500000 | USD | 20251106 | Open filing evidence |
| 2024-01-01 – 2024-06-30 | 699100000 | USD | 20250731 | Open filing evidence |
| 2024-01-01 – 2024-03-31 | 500300000 | USD | 20250508 | Open filing evidence |
Transferred Over Time · Electric Utilities
Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:ElectricUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 181862000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 391034000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 209172000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 864160000 | USD | 20230214 | Open filing evidence |
Transferred Over Time · Gas Utilities
Timing Of Transfer Of Good Or Service · Statement Business Segments
Source dimensions
us-gaap:TimingOfTransferOfGoodOrServiceAxis=us-gaap:TransferredOverTimeMember;us-gaap:StatementBusinessSegmentsAxis=bkh:GasUtilitiesMember| Period | Value | Unit | Filed | Evidence |
|---|---|---|---|---|
| 2023-04-01 – 2023-06-30 | 219940000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-06-30 | 918632000 | USD | 20230803 | Open filing evidence |
| 2023-01-01 – 2023-03-31 | 698692000 | USD | 20230504 | Open filing evidence |
| 2022-01-01 – 2022-12-31 | 1665249000 | USD | 20230214 | Open filing evidence |