Fair Value (Summary Of Fair Value Assets And Liabilities Measured On A Recurring Basis, Level 3) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Entity Information [Line Items]
Financial transmission rights	$ 1,235	$ 543
Total financial assets measured at fair value	4,840	3,768
Indianapolis Power And Light Company
Entity Information [Line Items]
Financial transmission rights	1,235	543
Total financial assets measured at fair value	1,235	543
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Entity Information [Line Items]
Financial transmission rights	0	0
Total financial assets measured at fair value	11	16
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Indianapolis Power And Light Company
Entity Information [Line Items]
Financial transmission rights	0	0
Total financial assets measured at fair value	0	0
Significant Observable Inputs (Level 2) [Member]
Entity Information [Line Items]
Financial transmission rights	0	0
Total financial assets measured at fair value	3,594	3,209
Significant Observable Inputs (Level 2) [Member] | Indianapolis Power And Light Company
Entity Information [Line Items]
Financial transmission rights	0	0
Total financial assets measured at fair value	0	0
Unobservable Inputs (Level 3) [Member]
Entity Information [Line Items]
Financial transmission rights	1,235	543
Total financial assets measured at fair value	1,235	543
Unobservable Inputs (Level 3) [Member] | Indianapolis Power And Light Company
Entity Information [Line Items]
Financial transmission rights	1,235	543
Total financial assets measured at fair value	$ 1,235	$ 543