Fair Value (Reconciliation Of Financial Instruments Classified As Level 3) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	$ 6,012	$ 5,559
Financial transmission rights	1,584	1,526
Investments, Fair Value Disclosure	4,428	4,033
Mutual Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	4,324	3,947
Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	104	86
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	4,428	4,033
Financial transmission rights	0	0
Investments, Fair Value Disclosure	4,428	4,033
Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	0	0
Financial transmission rights	0	0
Investments, Fair Value Disclosure	0	0
Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	1,584	1,526
Financial transmission rights	1,584	1,526
Investments, Fair Value Disclosure	0	0
Derivative Financial Instruments, net Liabilities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1,526	1,388
Issuances	4,718	3,811
Settlements	(4,660)	(3,673)
Ending balance	1,584	1,526
Indianapolis Power And Light Company
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	1,584	1,526
Financial transmission rights	1,584	1,526
Indianapolis Power And Light Company \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	0	0
Financial transmission rights	0	0
Indianapolis Power And Light Company \| Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	0	0
Financial transmission rights	0	0
Indianapolis Power And Light Company \| Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total financial assets measured at fair value	1,584	1,526
Financial transmission rights	1,584	1,526
Parent Company [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Forward Power Contracts Fair Value Disclosure	0	0
Total financial assets measured at fair value	4,428	4,033
Investments, Fair Value Disclosure	4,428	4,033
Parent Company [Member] \| Mutual Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	4,324	3,947
Parent Company [Member] \| Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	104	86
Parent Company [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Forward Power Contracts Fair Value Disclosure	0	0
Total financial assets measured at fair value	4,428	4,033
Investments, Fair Value Disclosure	4,428	4,033
Parent Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Mutual Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	4,324	3,947
Parent Company [Member] \| Fair Value, Inputs, Level 1 [Member] \| Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	104	86
Parent Company [Member] \| Significant Observable Inputs (Level 2) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Forward Power Contracts Fair Value Disclosure	0	0
Total financial assets measured at fair value	0	0
Investments, Fair Value Disclosure	0	0
Parent Company [Member] \| Significant Observable Inputs (Level 2) [Member] \| Mutual Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	0	0
Parent Company [Member] \| Significant Observable Inputs (Level 2) [Member] \| Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	0	0
Parent Company [Member] \| Unobservable Inputs (Level 3) [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Forward Power Contracts Fair Value Disclosure	0	0
Total financial assets measured at fair value	0	0
Investments, Fair Value Disclosure		0
Parent Company [Member] \| Unobservable Inputs (Level 3) [Member] \| Mutual Fund [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	0	0
Parent Company [Member] \| Unobservable Inputs (Level 3) [Member] \| Money Market Funds [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Investments, Fair Value Disclosure	$ 0	$ 0

IPALCO ENTERPRISES, INC. 10-K