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Transmission Line Electrical Potential

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ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details) customer in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026 USD ($) MW	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) customer subsidiary kilovolt_line segment mi MW	Jun. 30, 2025 USD ($)	May 31, 2026 MW	Dec. 31, 2025 USD ($)
Summary Of Accounting Policies [Line Items]
Owned generating capacity and renewable purchased power \| MW	15,800		15,800
Number of customers served \| customer			1.7
Number of segments \| segment			1
Unrealized Gain (Loss) on Investments	$ 97.8	$ 67.3	$ 72.3	$ 50.2
Prairie Wind Transmission, LLC
Summary Of Accounting Policies [Line Items]
Transmission line length \| mi			108
Transmission line electrical potential \| kilovolt_line			345
Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Unrealized Gain (Loss) on Investments	34.2	26.6	$ 26.7	28.1
Evergy Metro
Summary Of Accounting Policies [Line Items]
ApproximateMWNameplateCapacity \| MW					440
Unrealized Gain (Loss) on Investments	$ 63.6	40.6	$ 45.7	21.9
Evergy Kansas South Inc \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Number of active wholly owned subsidiaries \| subsidiary			1
Transource Energy, LLC \| Evergy Transmission Company LLC
Summary Of Accounting Policies [Line Items]
Ownership percentage	13.50%		13.50%
Transource Energy, LLC \| AEP Transmission Holding Company, LLC
Summary Of Accounting Policies [Line Items]
Ownership interest	86.50%		86.50%
Prairie Wind Transmission, LLC \| Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Ownership percentage	50.00%		50.00%
Early-Stage Clean Energy and Energy Solution Investments
Summary Of Accounting Policies [Line Items]
Equity investment fair value	$ 27.4		$ 27.4			$ 41.3
Unrealized Gain (Loss) on Investments	$ 7.9	$ 25.4	$ (8.1)	$ 29.0