v3.25.2
Debt (Schedule Long-Term Indebtedness) (Details) - USD ($)
$ in Thousands
6 Months Ended 9 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Jun. 30, 2024
Debt Instrument [Line Items]        
Unamortized discount - net $ (9,200)   $ (9,400)  
Deferred financing costs (34,300)   (34,700)  
Long-term debt 3,596,878   3,595,628  
Less: Current Portion of Long-term Debt 129,791   39,910  
Net Consolidated IPALCO Long-term Debt 3,467,087   3,555,718  
Proceeds from Secured Lines of Credit   $ 300,000    
Maximum borrowing capacity 500,000      
Line of Credit Facility, Accordion Feature Increase Limit 200,000      
Finance Lease, Liability, Current 0   217  
Finance Lease, Liability, Noncurrent 99,985   86,869  
Unused lines of Credit        
Debt Instrument [Line Items]        
Proceeds from Secured Lines of Credit 100,000 $ 100,000    
$400M Term Loan        
Debt Instrument [Line Items]        
Short-Term Bank Loans and Notes Payable 400,000     $ 400,000
Obligations        
Debt Instrument [Line Items]        
Finance Lease, Liability, Current 0   200  
Finance Lease, Liability, Noncurrent 100,000   86,900  
Indianapolis Power And Light Company [Member]        
Debt Instrument [Line Items]        
First mortgage bonds 2,731,031   2,730,238  
Unamortized discount - net (7,953)   (8,093)  
Long-term debt $ 2,731,031   2,730,238  
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 0.75%      
First mortgage bonds $ 30,000   30,000  
Indianapolis Power And Light Company [Member] | FMB Twenty - three        
Debt Instrument [Line Items]        
Debt, stated interest rate 0.95%      
First mortgage bonds $ 60,000   60,000  
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 0.65%      
First mortgage bonds $ 40,000   40,000  
Indianapolis Power And Light Company [Member] | First Mortgage Bond Twenty Six        
Debt Instrument [Line Items]        
Debt, stated interest rate 5.65%      
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  
Ipalco Enterprises, Inc. [Member]        
Debt Instrument [Line Items]        
Unamortized discount - net (1,290)   (1,331)  
Deferred financing costs (7,863)   (8,279)  
Net Consolidated IPALCO Long-term Debt 865,847   865,390  
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 $ (24,816)   (25,469)  
Line of Credit [Member] | Committed Line of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit, outstanding borrowings $ 0   $ 100,000