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PROPERTY, PLANT AND EQUIPMENT (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Electric plant in service $ 34,166.0 $ 32,129.3
Electric plant acquisition adjustment 724.9 724.3
Accumulated depreciation (13,043.1) (12,304.9)
Plant in service 21,847.8 20,548.7
Construction work in progress 1,543.5 1,421.2
Nuclear fuel, net 203.0 165.8
Plant to be retired, net 0.8 0.8
Property, plant and equipment, net 23,595.1 22,136.5
Variable Interest Entities    
Property, Plant and Equipment [Line Items]    
Electric plant in service 392.1 392.1
Accumulated depreciation (258.5) (251.4)
Property, plant and equipment, net 133.6 140.7
Evergy Kansas Central    
Property, Plant and Equipment [Line Items]    
Electric plant in service 16,466.6 15,376.9
Electric plant acquisition adjustment 724.9 724.3
Accumulated depreciation (6,244.2) (5,922.9)
Plant in service 10,947.3 10,178.3
Construction work in progress 939.1 819.5
Nuclear fuel, net 101.1 82.2
Plant to be retired, net 0.8 0.8
Property, plant and equipment, net 11,988.3 11,080.8
Evergy Kansas Central | Variable Interest Entities    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, net 133.6 140.7
Evergy Metro    
Property, Plant and Equipment [Line Items]    
Electric plant in service 13,005.5 12,343.3
Electric plant acquisition adjustment 0.0 0.0
Accumulated depreciation (5,404.9) (5,065.3)
Plant in service 7,600.6 7,278.0
Construction work in progress 428.7 482.6
Nuclear fuel, net 101.9 83.6
Plant to be retired, net 0.0 0.0
Property, plant and equipment, net $ 8,131.2 $ 7,844.2