Property, Plant and Equipment (Schedule Of Original Cost Of Utility Plant In Service) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Entity Information [Line Items]
Production	$ 4,099,110	$ 4,191,223
Transmission	436,257	408,380
Distribution	1,831,029	1,671,861
General plant	277,533	258,931
Total utility plant in service	6,643,929	6,530,395
Indianapolis Power And Light Company
Entity Information [Line Items]
Production	4,099,110	4,191,223
Transmission	436,257	408,380
Distribution	1,831,029	1,671,861
General plant	277,533	258,931
Total utility plant in service	$ 6,643,929	$ 6,530,395