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Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2019
Entity Information [Line Items]  
Schedule Of Original Cost Of Utility Plant In Service
 As of December 31,
 20212020
 (In Thousands)
Production$4,099,110 $4,191,223 
Transmission436,257 408,380 
Distribution1,831,029 1,671,861 
General plant277,533 258,931 
Total property, plant and equipment$6,643,929 $6,530,395 
Reconciliation Of Asset Retirement Obligation Liability The following is a roll forward of the ARO legal liability year end balances:
 20212020
 (In Thousands)
Balance as of January 1$195,236 $204,219 
Liabilities settled(13,692)(18,302)
Revisions to cash flow and timing estimates— 1,120 
Accretion expense7,965 8,199 
Balance as of December 31$189,509 $195,236 
Indianapolis Power And Light Company  
Entity Information [Line Items]  
Schedule Of Original Cost Of Utility Plant In Service
 As of December 31,
 20212020
 (In Thousands)
Production$4,099,110 $4,191,223 
Transmission436,257 408,380 
Distribution1,831,029 1,671,861 
General plant277,533 258,931 
Total property, plant and equipment$6,643,929 $6,530,395 
Reconciliation Of Asset Retirement Obligation Liability The following is a roll forward of the ARO legal liability year end balances:
 20212020
 (In Thousands)
Balance as of January 1$195,236 $204,219 
Liabilities settled(13,692)(18,302)
Revisions to cash flow and timing estimates— 1,120 
Accretion expense7,965 8,199 
Balance as of December 31$189,509 $195,236