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JOINTLY-OWNED ELECTRIC UTILITY PLANTS (Details) $ in Millions | Dec. 31, 2023 | Dec. 31, 2023 USD ($) | Dec. 31, 2023 Rate | Dec. 31, 2023 MW | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | --- | ---
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Nuclear fuel, net |  | $ 203.0 |  |  | $ 165.8
Wolf Creek Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 94.00% |  | 94.00% |  |
Electric plant in service |  | 4,328.9 |  |  |
Accumulated depreciation |  | 2,221.1 |  |  |
Nuclear fuel, net |  | 203.0 |  |  |
Construction work in progress |  | 192.6 |  |  |
Accredited capacity | MW |  |  |  | 1,106 |
La Cygne Units |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 100.00% |  |
Electric plant in service |  | 2,280.0 |  |  |
Accumulated depreciation |  | 981.3 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 33.6 |  |  |
Accredited capacity | MW |  |  |  | 1,426 |
Iatan No. 1 Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 88.00% |  |
Electric plant in service |  | 793.6 |  |  |
Accumulated depreciation |  | 279.3 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 13.5 |  |  |
Accredited capacity | MW |  |  |  | 618 |
Iatan No. 2 Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 73.00% |  |
Electric plant in service |  | 1,404.3 |  |  |
Accumulated depreciation |  | 457.8 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 10.1 |  |  |
Accredited capacity | MW |  |  |  | 653 |
Iatan Common |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 79.00% |  |
Electric plant in service |  | 517.5 |  |  |
Accumulated depreciation |  | 134.6 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 3.4 |  |  |
Jeffrey Energy Center |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 100.00% |  |
Electric plant in service |  | 2,451.6 |  |  |
Accumulated depreciation |  | 1,042.1 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 186.8 |  |  |
Accredited capacity | MW |  |  |  | 2,186 |
State Line |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 40.00% |  |
Electric plant in service |  | 134.9 |  |  |
Accumulated depreciation |  | 96.5 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 7.7 |  |  |
Accredited capacity | MW |  |  |  | 209 |
Evergy Kansas Central |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Nuclear fuel, net |  | 101.1 |  |  | 82.2
Evergy Kansas Central | Wolf Creek Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 47.00% |  | 47.00% |  |
Electric plant in service |  | 2,125.2 |  |  |
Accumulated depreciation |  | 1,082.6 |  |  |
Nuclear fuel, net |  | 101.1 |  |  |
Construction work in progress |  | 80.9 |  |  |
Accredited capacity | MW |  |  |  | 553 |
Evergy Kansas Central | La Cygne Units |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 50.00% |  |
Electric plant in service |  | 1,049.7 |  |  |
Accumulated depreciation |  | 530.7 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 17.0 |  |  |
Accredited capacity | MW |  |  |  | 713 |
Evergy Kansas Central | Jeffrey Energy Center |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 92.00% |  |
Electric plant in service |  | 2,243.1 |  |  |
Accumulated depreciation |  | 958.2 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 171.6 |  |  |
Accredited capacity | MW |  |  |  | 2,011 |
Evergy Kansas Central | State Line |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 40.00% |  |
Electric plant in service |  | 134.9 |  |  |
Accumulated depreciation |  | 96.5 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 7.7 |  |  |
Accredited capacity | MW |  |  |  | 209 |
Evergy Metro |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Nuclear fuel, net |  | 101.9 |  |  | $ 83.6
Evergy Metro | Wolf Creek Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | 47.00% |  | 47.00% |  |
Electric plant in service |  | 2,203.7 |  |  |
Accumulated depreciation |  | 1,138.5 |  |  |
Nuclear fuel, net |  | 101.9 |  |  |
Construction work in progress |  | 111.7 |  |  |
Accredited capacity | MW |  |  |  | 553 |
Evergy Metro | La Cygne Units |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 50.00% |  |
Electric plant in service |  | 1,230.3 |  |  |
Accumulated depreciation |  | 450.6 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 16.6 |  |  |
Accredited capacity | MW |  |  |  | 713 |
Evergy Metro | Iatan No. 1 Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 70.00% |  |
Electric plant in service |  | 617.2 |  |  |
Accumulated depreciation |  | 237.3 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 10.8 |  |  |
Accredited capacity | MW |  |  |  | 492 |
Evergy Metro | Iatan No. 2 Unit |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 55.00% |  |
Electric plant in service |  | 1,059.7 |  |  |
Accumulated depreciation |  | 430.1 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | 7.6 |  |  |
Accredited capacity | MW |  |  |  | 491 |
Evergy Metro | Iatan Common |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Jointly owned utility plant, proportionate ownership share | Rate |  |  | 61.00% |  |
Electric plant in service |  | 410.4 |  |  |
Accumulated depreciation |  | 123.1 |  |  |
Nuclear fuel, net |  | 0.0 |  |  |
Construction work in progress |  | $ 2.4 |  |  |
Subsidiaries | La Cygne Unit 2 |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Leasehold interest percentage | 50.00% |  |  |  |
Subsidiaries | Evergy Kansas Central | La Cygne Unit 2 |  |  |  |  |
Jointly Owned Utility Plant Interests [Line Items] |  |  |  |  |
Leasehold interest percentage | 50.00% |  |  |  |

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- Definition The accredited capacity of the jointly owned electric utility plant, in megawatts. + References No definition available. + Details
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- Definition The period end amount owned by the reporting utility of a jointly owned utility plant in service. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition The period end amount of construction work in progress at a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition The period end amount of accumulated depreciation in a jointly owned electricity generation plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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- Definition The proportionate share of interest (percent) in a jointly owned utility plant. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 360 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 10.C) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479960/980-360-S99-1 + Details
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