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TAXES - Deferred Income Taxes (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Tax credit carryforward $ 288.9 $ 311.0
Income taxes refundable to customers, net 289.4 311.0
Deferred employee benefit costs 101.5 86.2
Net operating loss carryforward 22.5 31.7
Deferred state income taxes 141.0 145.6
Accrued liabilities 185.9 169.7
Other regulatory liabilities 132.0 116.4
Other 121.7 131.7
Total deferred tax assets before valuation allowance 1,282.9 1,303.3
Valuation allowances (14.8) (12.8)
Total deferred tax assets, net 1,268.1 1,290.5
Deferred tax liabilities:    
Plant-related (2,818.4) (2,770.9)
Deferred employee benefit costs (11.1) (8.8)
ARO regulatory assets (37.4) (40.6)
Acquisition premium (159.1) (144.3)
Other regulatory assets (231.3) (195.6)
Other (108.7) (126.9)
Total deferred tax liabilities (3,366.0) (3,287.1)
Net deferred income tax liabilities (2,097.9) (1,996.6)
Evergy Kansas Central    
Deferred tax assets:    
Tax credit carryforward 242.7 226.9
Income taxes refundable to customers, net 149.1 156.5
Deferred employee benefit costs 52.1 45.1
Net operating loss carryforward 0.0 0.0
Deferred state income taxes 99.2 99.8
Accrued liabilities 85.9 77.5
Other regulatory liabilities 86.4 43.7
Other 64.2 69.0
Total deferred tax assets before valuation allowance 779.6 718.5
Valuation allowances (2.7) 0.0
Total deferred tax assets, net 776.9 718.5
Deferred tax liabilities:    
Plant-related (1,397.1) (1,333.2)
Deferred employee benefit costs (10.6) (8.3)
ARO regulatory assets (37.4) (40.6)
Acquisition premium (67.2) (59.4)
Other regulatory assets (43.6) (41.7)
Other (65.2) (79.8)
Total deferred tax liabilities (1,621.1) (1,563.0)
Net deferred income tax liabilities (844.2) (844.5)
Evergy Metro    
Deferred tax assets:    
Tax credit carryforward 43.6 77.6
Income taxes refundable to customers, net 103.6 113.6
Deferred employee benefit costs 58.2 54.7
Net operating loss carryforward 0.0 0.0
Deferred state income taxes 36.2 38.6
Accrued liabilities 66.8 61.6
Other regulatory liabilities 17.1 30.6
Other 25.1 28.2
Total deferred tax assets before valuation allowance 350.6 404.9
Valuation allowances 0.0 0.0
Total deferred tax assets, net 350.6 404.9
Deferred tax liabilities:    
Plant-related (1,030.2) (1,016.4)
Deferred employee benefit costs 0.0 0.0
ARO regulatory assets 0.0 0.0
Acquisition premium (60.3) (54.3)
Other regulatory assets (34.1) (28.6)
Other (23.2) (26.5)
Total deferred tax liabilities (1,147.8) (1,125.8)
Net deferred income tax liabilities $ (797.2) $ (720.9)