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Fair Value (Narrative) (Details)
MWh in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
MWh
Dec. 31, 2022
USD ($)
Entity Information [Line Items]    
Investments, Fair Value Disclosure $ 3,552 $ 3,228
Revisions to cash flow and timing estimates 12,921 44,679
Deferred financing costs, net 23,612  
Unamortized debt discount 6,768  
Asset retirement obligations 249,930 218,729
Regulatory assets, non-current 541,784 593,939
Financial transmission rights 1,388 7,545
Total financial assets measured at fair value 19,234 22,945
Unamortized Debt Discount    
Entity Information [Line Items]    
Unamortized debt discount 6,800 7,100
Unamortized Deferred Financing Cost    
Entity Information [Line Items]    
Deferred financing costs, net 24,800 26,300
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Derivative, Notional Amount, Purchase (Sales), Net 400,000  
Purchase of Derivative Instruments Interest Rate Swap 400,000  
Sale of Derivative Instruments Interest Rate Swap $ 0  
FTR [Member] | Not Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Sale of Units Derivative Instruments Financial Transmission Rights | MWh 0  
Petersburg Unit 1 retirement    
Entity Information [Line Items]    
Regulatory assets, non-current $ 35,700  
Indianapolis Power And Light Company    
Entity Information [Line Items]    
Revisions to cash flow and timing estimates 12,921 44,679
Deferred financing costs, net 20,200 20,400
Unamortized debt discount 6,449 6,651
Asset retirement obligations 249,930 218,729
Regulatory assets, non-current 541,784 593,939
Financial transmission rights 1,388 7,545
Total financial assets measured at fair value 1,388 7,545
Indianapolis Power And Light Company | Variable Rate [Member]    
Entity Information [Line Items]    
Unamortized debt discount $ (6,400) 6,700
Indianapolis Power And Light Company | FTR [Member] | Not Designated as Hedging Instrument [Member]    
Entity Information [Line Items]    
Sale of Units Derivative Instruments Financial Transmission Rights | MWh 0  
Indianapolis Power And Light Company | Petersburg Unit 1 retirement    
Entity Information [Line Items]    
Regulatory assets, non-current   287,463
Money Market Funds [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure $ 127 5
Mutual Fund [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 3,425 3,223
Fair Value, Inputs, Level 1 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 3,552 3,228
Financial transmission rights 0 0
Total financial assets measured at fair value 3,552 3,228
Fair Value, Inputs, 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
Fair Value, Inputs, Level 2 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Financial transmission rights 0 0
Total financial assets measured at fair value 14,294 12,172
Fair Value, 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
Fair Value, Inputs, Level 3 [Member]    
Entity Information [Line Items]    
Investments, Fair Value Disclosure 0 0
Financial transmission rights 1,388 7,545
Total financial assets measured at fair value 1,388 7,545
Fair Value, Inputs, Level 3 [Member] | Indianapolis Power And Light Company    
Entity Information [Line Items]    
Financial transmission rights 1,388 7,545
Total financial assets measured at fair value $ 1,388 $ 7,545