Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Entity Information [Line Items]
Relating to utility property, net	$ 369,783	$ 408,291
Regulatory assets recoverable through future rates	126,531	82,783
Other	14,326	5,485
Total deferred tax liabilities	510,640	496,559
Investment tax credit	7	6
Regulatory liabilities including ARO	200,948	197,657
Employee benefit plans	0	3,866
Other	18,958	19,316
Total deferred tax assets	219,913	220,845
Deferred income tax liability – net	290,727	275,714
Indianapolis Power And Light Company
Entity Information [Line Items]
Relating to utility property, net	369,783	408,291
Regulatory assets recoverable through future rates	126,531	82,783
Other	18,283	5,323
Total deferred tax liabilities	514,597	496,397
Investment tax credit	7	6
Regulatory liabilities including ARO	205,099	197,657
Employee benefit plans	0	3,866
Other	9,313	5,069
Total deferred tax assets	214,419	206,598
Deferred income tax liability – net	$ 300,178	$ 289,799