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RATE MATTERS AND REGULATION (Tables) | 12 Months Ended
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Dec. 31, 2023
Regulated Operations [Abstract] |
Schedule of Regulatory Assets | The Evergy Companies' regulatory assets and liabilities are detailed in the following tables.
|  | December 31
|  | 2023 |  | 2022
|  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Regulatory Assets |  | (millions)
Pension and post-retirement costs |  | $ | 91.6 |  |  | $ | 29.7 |  |  | $ | — |  |  | $ | 137.3 |  |  | $ | 54.9 |  |  | $ | — |
Debt reacquisition costs |  | 81.2 |  |  | 75.3 |  |  | 5.3 |  |  | 87.7 |  |  | 80.9 |  |  | 6.0 |
Debt fair value adjustment |  | 87.0 |  |  | — |  |  | — |  |  | 92.1 |  |  | — |  |  | — |
Asset retirement obligations fair value adjustment |  | 120.7 |  |  | — |  |  | — |  |  | 119.4 |  |  | — |  |  | — |
Depreciation |  | 168.7 |  |  | 44.6 |  |  | 66.0 |  |  | 159.1 |  |  | 47.2 |  |  | 57.1 |
Cost of removal |  | 372.3 |  |  | 165.6 |  |  | 168.2 |  |  | 346.8 |  |  | 158.2 |  |  | 140.6 |
Asset retirement obligations |  | 152.9 |  |  | 65.9 |  |  | 64.0 |  |  | 127.5 |  |  | 54.5 |  |  | 53.4 |
Analog meter unrecovered investment |  | 8.3 |  |  | 8.3 |  |  | — |  |  | 12.6 |  |  | 12.6 |  |  | — |
Treasury yield hedges |  | 18.1 |  |  | 18.1 |  |  | — |  |  | 19.2 |  |  | 19.2 |  |  | — |
Iatan No. 1 and common facilities |  | 5.9 |  |  | — |  |  | 2.5 |  |  | 6.2 |  |  | — |  |  | 2.6 |
Iatan No. 2 construction accounting costs |  | 23.4 |  |  | — |  |  | 11.7 |  |  | 24.0 |  |  | — |  |  | 12.0 |
Property taxes |  | 56.0 |  |  | 28.3 |  |  | 25.3 |  |  | 51.4 |  |  | 33.0 |  |  | 15.8 |
Disallowed plant costs |  | 13.5 |  |  | 13.5 |  |  | — |  |  | 13.9 |  |  | 13.9 |  |  | — |
La Cygne environmental costs |  | 8.8 |  |  | 6.8 |  |  | 2.0 |  |  | 10.0 |  |  | 7.9 |  |  | 2.1 |
Deferred customer programs |  | 20.3 |  |  | 6.7 |  |  | 11.2 |  |  | 14.3 |  |  | 6.5 |  |  | 6.7 |
Fuel recovery mechanisms |  | 101.3 |  |  | — |  |  | 14.1 |  |  | 188.5 |  |  | — |  |  | 13.5 |
February 2021 winter weather event |  | 403.5 |  |  | 79.7 |  |  | — |  |  | 430.9 |  |  | 121.9 |  |  | — |
Solar rebates |  | 9.9 |  |  | — |  |  | — |  |  | 15.6 |  |  | — |  |  | — |
Transmission delivery charge |  | 2.0 |  |  | 0.9 |  |  | 1.1 |  |  | 1.5 |  |  | — |  |  | 1.5 |
Wolf Creek outage |  | 8.4 |  |  | 4.2 |  |  | 4.2 |  |  | 22.8 |  |  | 11.4 |  |  | 11.4 |
Pension and other post-retirement benefit non-service costs |  | 85.8 |  |  | 32.0 |  |  | 34.2 |  |  | 75.3 |  |  | 24.8 |  |  | 30.7 |
Retired generation facilities |  | 138.2 |  |  | — |  |  | — |  |  | 146.3 |  |  | — |  |  | — |
Merger transition costs |  | 23.1 |  |  | 11.0 |  |  | 8.6 |  |  | 28.1 |  |  | 13.3 |  |  | 10.5 |
Other regulatory assets |  | 86.5 |  |  | 42.3 |  |  | 15.6 |  |  | 83.8 |  |  | 51.7 |  |  | 9.9 |
Total |  | 2,087.4 |  |  | 632.9 |  |  | 434.0 |  |  | 2,214.3 |  |  | 711.9 |  |  | 373.8 |
Less: current portion |  | (292.1) |  |  | (127.7) |  |  | (53.2) |  |  | (368.0) |  |  | (121.9) |  |  | (42.3) |
Total noncurrent regulatory assets |  | $ | 1,795.3 |  |  | $ | 505.2 |  |  | $ | 380.8 |  |  | $ | 1,846.3 |  |  | $ | 590.0 |  |  | $ | 331.5 |
Schedule of Regulatory Liabilities |
|  | December 31
|  | 2023 |  | 2022
|  | Evergy |  | Evergy Kansas Central |  | Evergy Metro |  | Evergy |  | Evergy Kansas Central |  | Evergy Metro
Regulatory Liabilities |  | (millions)
Taxes refundable through future rates |  | $ | 1,737.8 |  |  | $ | 1,047.2 |  |  | $ | 519.2 |  |  | $ | 1,866.6 |  |  | $ | 1,084.2 |  |  | $ | 586.6 |
Deferred regulatory gain from sale leaseback |  | 31.6 |  |  | 31.6 |  |  | — |  |  | 37.1 |  |  | 37.1 |  |  | — |
Emission allowances |  | 34.2 |  |  | — |  |  | 34.2 |  |  | 38.2 |  |  | — |  |  | 38.2 |
Nuclear decommissioning |  | 318.7 |  |  | 125.5 |  |  | 193.2 |  |  | 246.3 |  |  | 103.4 |  |  | 142.9 |
Pension and post-retirement costs |  | 124.8 |  |  | 21.9 |  |  | 100.5 |  |  | 98.4 |  |  | 23.0 |  |  | 72.5 |
Jurisdictional allowance for funds used during construction |  | 24.4 |  |  | 22.7 |  |  | 1.7 |  |  | 25.9 |  |  | 24.2 |  |  | 1.7 |
La Cygne leasehold dismantling costs |  | 29.6 |  |  | 29.6 |  |  | — |  |  | 29.6 |  |  | 29.6 |  |  | — |
Kansas tax credits |  | 16.8 |  |  | 16.8 |  |  | — |  |  | 23.5 |  |  | 23.5 |  |  | — |
Purchase power agreement |  | 3.7 |  |  | 3.7 |  |  | — |  |  | 4.1 |  |  | 4.1 |  |  | — |
Fuel recovery mechanisms |  | 34.7 |  |  | 34.7 |  |  | — |  |  | 4.7 |  |  | 4.5 |  |  | 0.2 |
February 2021 winter weather event |  | 13.0 |  |  | — |  |  | 13.0 |  |  | 37.8 |  |  | — |  |  | 37.8 |
Sibley AAO |  | 79.2 |  |  | — |  |  | — |  |  | 108.0 |  |  | — |  |  | — |
TFR refunds |  | 11.2 |  |  | 11.2 |  |  | — |  |  | 55.5 |  |  | 55.5 |  |  | — |
COLI rate credits refund |  | 96.5 |  |  | 96.5 |  |  | — |  |  | — |  |  | — |  |  | — |
Phase-in plan |  | 38.1 |  |  | 38.1 |  |  | — |  |  | 25.1 |  |  | 25.1 |  |  | — |
Other regulatory liabilities |  | 131.2 |  |  | 57.0 |  |  | 41.4 |  |  | 121.4 |  |  | 26.8 |  |  | 48.2 |
Total |  | 2,725.5 |  |  | 1,536.5 |  |  | 903.2 |  |  | 2,722.2 |  |  | 1,441.0 |  |  | 928.1 |
Less: current portion |  | (183.0) |  |  | (104.1) |  |  | (43.0) |  |  | (155.4) |  |  | (72.1) |  |  | (55.3) |
Total noncurrent regulatory liabilities |  | $ | 2,542.5 |  |  | $ | 1,432.4 |  |  | $ | 860.2 |  |  | $ | 2,566.8 |  |  | $ | 1,368.9 |  |  | $ | 872.8 |

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