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Increase In Regulatory Asset

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Public Utilities Approved Rate Increase Decrease Amount Not Including Certain Open Items

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Public utilities, estimated annual transmissions revenue amount of increase (decrease) over prior year

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Public Utilities Estimated Refund On Earnings Over Approved Return On Equity

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Public Utilities, Refund Percent On Earnings Over Approved Return On Equity

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Public utilities requested rate increase decrease amount rebasing fuel purchased power expense proprty tax and credit loss expense tracker storm reserve and return on unrecovered investment

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Public Utilities Requested Increase of Recovery

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Public Utilities, Requested Refund Increase (Decrease), Amount

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- Definition

The expense charged against earnings during the period to allocate the capitalized costs of regulatory assets over the periods expected to benefit from such costs.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of public utility's approved rate increase (decrease) by regulatory agency.

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Percentage of public utility's approved return on equity.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage of public utility's requested equity to capital, including debt and equity.

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Percentage of public utility's requested return on equity.

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Amortization period for the recovery of regulatory asset, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

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The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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RATE MATTERS AND REGULATION - Narrative (Details) $ in Millions	1 Months Ended					3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	May 31, 2022 USD ($)	Apr. 30, 2022 USD ($)	Jan. 31, 2022 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Regulatory Proceedings [Line Items]
Deferral of revenues to regulatory liability for refund to customers for return on investment of retired Sibley Station						$ 47.5	$ 47.5
Interest rate	5.06%					5.06%	5.06%
Amortization of regulatory asset							$ 7.1
Retired generation facilities
Regulatory Proceedings [Line Items]
Regulatory assets	$ 25.6					$ 25.6	$ 25.6	$ 123.4
Evergy Metro \| Missouri Public Service Commission
Regulatory Proceedings [Line Items]
Public Utilities, Recovery Mechanism Percent for Fuel Cost							0.95
Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost							0.05
Evergy Missouri West \| Missouri Public Service Commission
Regulatory Proceedings [Line Items]
Public Utilities, Recovery Mechanism Percent for Fuel Cost							0.95
Public Utilities, Recovery Mechanism's Sharing Percentage for Fuel Cost							0.05
Transmission delivery charge \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue increase (decrease) approved			$ 20.4
Transmission delivery charge \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Annual revenue increase (decrease) approved		$ 7.9
2018 Rate Case Proceedings \| Evergy Kansas Central \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity							0.50
Approved return on equity, percentage							9.30%
Estimated refund on earnings over approved return on equity	0.0					0.0	$ 0.0
2018 Rate Case Proceedings \| Evergy Metro \| Kansas Corporation Commission
Regulatory Proceedings [Line Items]
Refund percent on earnings over approved return on equity							0.50
Approved return on equity, percentage							9.30%
Estimated refund on earnings over approved return on equity	0.0					0.0	$ 0.0
2022 Rate case proceedings \| Evergy Metro
Regulatory Proceedings [Line Items]
Return on equity, requested				10.00%
Annual revenue increase (decrease), requested, not including rebasing fuel, purchased power expense and/or property tax expense				$ 43.9
Rate-making equity ratio, requested				51.19%
Annual revenue increase (decrease) related to rebasing, property tax and credit loss expense, storm reserve and return on unrecovered investment				$ 3.8
PublicUtilitiesApprovedRateIncreaseDecreaseAmountNotIncludingCertainOpenItems	25.0
2022 Rate case proceedings \| Evergy Missouri West
Regulatory Proceedings [Line Items]
Return on equity, requested				10.00%
Annual revenue increase (decrease), requested, not including rebasing fuel, purchased power expense and/or property tax expense				$ 27.7
Rate-making equity ratio, requested				51.81%
Annual revenue increase (decrease) related to rebasing, property tax and credit loss expense, storm reserve and return on unrecovered investment				$ 32.1
PublicUtilitiesApprovedRateIncreaseDecreaseAmountNotIncludingCertainOpenItems	42.5
Evergy Missouri West Other Proceedings
Regulatory Proceedings [Line Items]
Deferral of revenues to regulatory liability for refund to customers for return on investment of retired Sibley Station						47.5	47.5
Evergy Missouri West Other Proceedings \| Revenues probable of refund
Regulatory Proceedings [Line Items]
Regulatory liabilities	84.7					84.7	84.7	$ 29.3
Evergy Missouri West Other Proceedings \| Retired generation facilities
Regulatory Proceedings [Line Items]
Regulatory assets	25.6					25.6	25.6
FERC 2023 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							43.6
FERC 2023 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							8.6
FERC 2022 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							33.2
FERC 2022 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							18.1
FERC 2021 TFR Proceeding \| Evergy Kansas Central \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							32.4
FERC 2021 TFR Proceeding \| Evergy Metro \| Federal Energy Regulatory Commission
Regulatory Proceedings [Line Items]
Annual transmissions revenue estimated amount of increase (decrease) over prior year							(3.9)
2021 KCC Winter Weather AAO \| Evergy Kansas Central
Regulatory Proceedings [Line Items]
Carrying charges application rate			1.00%
2021 KCC Winter Weather AAO \| Evergy Kansas Central \| February 2021 winter weather event
Regulatory Proceedings [Line Items]
Regulatory assets	120.0					120.0	120.0
2021 KCC Winter Weather AAO \| Evergy Metro
Regulatory Proceedings [Line Items]
Public Utilities, Requested Refund Increase (Decrease), Amount			$ (5.0)
Carrying charges application rate			1.00%
2021 KCC Winter Weather AAO \| Evergy Metro \| February 2021 winter weather event
Regulatory Proceedings [Line Items]
Regulatory liabilities	40.0					40.0	40.0
2021 MPSC Winter Weather \| Evergy Metro
Regulatory Proceedings [Line Items]
Public Utilities, Requested Refund Increase (Decrease), Amount					$ (5.0)
2021 MPSC Winter Weather \| Evergy Metro \| February 2021 winter weather event
Regulatory Proceedings [Line Items]
Regulatory liabilities	25.0					25.0	25.0
2021 MPSC Winter Weather \| Evergy Missouri West
Regulatory Proceedings [Line Items]
Public Utilities Requested Increase of Recovery					$ 15.0
2021 MPSC Winter Weather \| Evergy Missouri West \| February 2021 winter weather event
Regulatory Proceedings [Line Items]
Regulatory assets	280.0					280.0	$ 280.0
2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization
Regulatory Proceedings [Line Items]
Regulatory Asset, Amortization Period							15 years
2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization \| Maximum
Regulatory Proceedings [Line Items]
Regulatory Asset, Amortization Period							17 years
2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization \| Evergy Missouri West \| 2021 Winter Weather Qualified Extraordinary Costs Securitization
Regulatory Proceedings [Line Items]
Regulatory assets	303.1					303.1	$ 303.1
2021 MPSC Winter Weather Qualified Extraordinary Costs Securitization \| Evergy Missouri West \| 2021 Winter Weather Qualified Carrying Costs Securitization
Regulatory Proceedings [Line Items]
Increase in regulatory asset	$ 15.0					$ 15.0	$ 15.0