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ORGANIZATION AND BASIS OF PRESENTATION - Organization (Details) customer in Millions, $ in Millions		3 Months Ended
	Aug. 09, 2022 USD ($) MW	Mar. 31, 2023 segment subsidiary customer kilovolt_line mi MW	Mar. 31, 2022 USD ($)
Summary Of Accounting Policies [Line Items]
Owned generating capacity and renewable purchased power | MW		15,400
Number of customers served | customer		1.7
Number of segments | segment		1
Equity investment loss, net of derivative gain | $			$ 14.2
2022OklahomaWindFarmPurchase [Member]
Summary Of Accounting Policies [Line Items]
Asset Acquisition, Price of Acquisition, Expected | $	$ 250.0
ApproximateMWNameplateCapacity | MW	199
Prairie Wind Transmission, LLC
Summary Of Accounting Policies [Line Items]
Transmission line length | mi		108
Transmission line electrical potential | kilovolt_line		345
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%
Transource Energy, LLC | AEP Transmission Holding Company, LLC
Summary Of Accounting Policies [Line Items]
Ownership interest		86.50%
Prairie Wind Transmission, LLC | Evergy Kansas Central
Summary Of Accounting Policies [Line Items]
Ownership percentage		50.00%

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Number Of Wholly Owned Subsidiaries

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Owned Generating Capacity and Renewable Purchased Power

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[Line Items] for Summary Of Accounting Policies [Table]

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Transmission Line Electrical Potential

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Purchase price of expected asset acquisition prior to consideration being transferred. Excludes business acquisition.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 50
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