v3.26.3
Debt (Schedule Long-Term Indebtedness) (Details) - USD ($)
$ in Thousands
Sep. 30, 2026
Dec. 31, 2025
Debt Instrument [Line Items]    
Long-term debt $ 3,904,334 $ 3,903,377
Less: Current Portion of Long-term Debt 0 89,902
Net Consolidated IPALCO Long-term Debt 3,904,334 3,813,475
Maximum borrowing capacity 500,000  
Line of Credit Facility, Accordion Feature Increase Limit 200,000  
Finance Lease, Liability, Current 6 154
Finance Lease, Liability, Noncurrent 107,048 107,079
Obligations    
Debt Instrument [Line Items]    
Finance Lease, Liability, Current 0 200
Finance Lease, Liability, Noncurrent 107,000 107,100
Indianapolis Power And Light Company [Member]    
Debt Instrument [Line Items]    
Unamortized discount - net (8,730) (9,021)
Long-term debt $ 3,037,137 3,037,074
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.55% Due December 2024 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 0.75%  
First mortgage bonds $ 0 30,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due January 2034 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.60%  
First mortgage bonds $ 100,000 100,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.05% Due October 2036 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.05%  
First mortgage bonds $ 158,800 158,800
Indianapolis Power And Light Company [Member] | First Mortgage Bond 6.60% Due June 2037 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 6.60%  
First mortgage bonds $ 165,000 165,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.875% Due November 2041 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.875%  
First mortgage bonds $ 140,000 140,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.65% Due June 2043 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.65%  
First mortgage bonds $ 170,000 170,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.50% Due June 2044[Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.50%  
First mortgage bonds $ 130,000 130,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond 4.70%, Due September 2045 [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.70%  
First mortgage bonds $ 260,000 260,000
Indianapolis Power And Light Company [Member] | FMB Twenty [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.05%  
First mortgage bonds $ 350,000 350,000
Indianapolis Power And Light Company [Member] | FMB Twenty - one [Member]    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.875%  
First mortgage bonds $ 105,000 105,000
Indianapolis Power And Light Company [Member] | FMB Twenty - two    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.90%  
Indianapolis Power And Light Company [Member] | FMB Twenty - three    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.15%  
Indianapolis Power And Light Company [Member] | FMB Twenty - four    
Debt Instrument [Line Items]    
Debt, stated interest rate 1.40%  
First mortgage bonds $ 55,000 55,000
Indianapolis Power And Light Company [Member] | FMB Twenty - five    
Debt Instrument [Line Items]    
Debt, stated interest rate 0.95%  
First mortgage bonds $ 0 60,000
Indianapolis Power And Light Company [Member] | First Mortgage Bond Twenty Six    
Debt Instrument [Line Items]    
First mortgage bonds $ 350,000 350,000
Indianapolis Power And Light Company [Member] | FMB Twenty Seven    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.70%  
First mortgage bonds $ 650,000 650,000
Indianapolis Power And Light Company [Member] | FMB 2035 - 5.05%    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.05%  
First mortgage bonds $ 350,000 350,000
Indianapolis Power And Light Company [Member] | $30M Series 2020B tax-exempt Indiana Finance Authority Environmental Facilities Refunding Revenue Bonds [Abstract]    
Debt Instrument [Line Items]    
First mortgage bonds 30,000 0
Indianapolis Power And Light Company [Member] | $60M Series 2020B tax-exempt Indiana Finance Authority Environmental Facilities Refunding Revenue Bonds    
Debt Instrument [Line Items]    
First mortgage bonds $ 60,000 0
Indianapolis Power And Light Company [Member] | 5.65% debt due in 2032    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.65%  
Ipalco Enterprises, Inc. [Member]    
Debt Instrument [Line Items]    
Unamortized discount - net $ (1,163) (1,249)
Deferred financing costs (6,640) (7,448)
Net Consolidated IPALCO Long-term Debt 867,197 866,303
Ipalco Enterprises, Inc. [Member] | 5.00% Senior Secured Notes [Member]    
Debt Instrument [Line Items]    
Long-term debt $ 400,000 400,000
Ipalco Enterprises, Inc. [Member] | Four Point Two Five Percent Senior Secured Notes    
Debt Instrument [Line Items]    
Debt, stated interest rate 4.25%  
Long-term debt $ 475,000 475,000
Parent | Five Point Seven Five Percent Senior Secured Notes    
Debt Instrument [Line Items]    
Debt, stated interest rate 5.75%  
First Mortgage Bonds [Member] | Indianapolis Power And Light Company [Member]    
Debt Instrument [Line Items]    
Deferred financing costs $ (27,933) (27,705)
Line of Credit [Member] | Committed Line of Credit [Member]    
Debt Instrument [Line Items]    
Line of credit, outstanding borrowings $ 235,000 $ 0