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Overview and Summary of Significant Accounting Policies (Details)
 12 Months Ended
Feb. 16, 2026
Dec. 31, 2023
USD ($)
customer
generating_station
item
MW
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2019
segment
May 31, 2021
Dec. 31, 2020
USD ($)
Significant Accounting Policies [Line Items]              
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ 29,294,000 $ 22,269,000 $ (29,407,000)     $ (43,420,000)
Other Comprehensive Income (Loss), Net of Tax   7,025,000 51,676,000 14,013,000      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   1,594,000 46,245,000 10,393,000      
Public Utilities, Approved Rate Increase (Decrease), Amount   43,900,000          
Public Utilities, Inventory   77,198,000 60,497,000        
Receivables from Customers   125,715,000 125,540,000        
Cash and Cash Equivalents, at Carrying Value   28,579,000 201,548,000        
Service cost   5,189,000 8,949,000 9,339,000      
Interest cost   $ 29,818,000 18,099,000 $ 15,660,000      
Ownership interest in IPALCO by AES U.S. Investments (percent)   82.35%          
Ownership interest in IPALCO by CDPQ (percent)   17.65%          
Number of customers | customer   523,000          
Number of generating stations | generating_station   4          
Electric generation capability for winter, megawatts | MW   3,070          
Electric generation capability for summer, megawatts | MW   2,925          
Total other non-current assets   $ 1,120,591,000 849,054,000        
Unbilled energy revenues   91,463,000 74,488,000        
Loans and Leases Receivable, Related Parties, Description   5,178,000 239,000        
Provision for doubtful accounts   $ 7,413,000 $ 5,851,000        
Number of suppliers | item   1          
Capitalized amount, rate   7.10% 5.40% 5.70%      
Depreciation rate   3.70% 3.80% 3.70%      
Depreciation expense   $ 244,800,000 $ 247,500,000 $ 239,100,000      
Utility plant assets   4,500,000,000 4,000,000,000        
Number of segments | segment         2    
Intangible assets - net   235,656,000 138,978,000        
Restricted Cash and Cash Equivalents   5,000 5,000        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   28,584,000 201,553,000 6,917,000     26,622,000
Other Receivables   13,848,000 17,373,000        
Accounts Receivable, Allowance for Credit Loss   (2,283,000) (1,117,000)        
Receivables, Net, Current   233,921,000 216,523,000        
Materials and Supplies, Average Cost   66,392,000 63,111,000        
Inventory, Net   143,590,000 123,608,000        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax   1,594,000 46,245,000 10,393,000      
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent   5,431,000 5,431,000 3,620,000      
Accounts receivable and unbilled revenue, allowance for doubtful accounts   2,283,000 1,117,000 647,000      
Accounts Receivable, Allowance for Credit Loss, Writeoff   (7,764,000) (7,008,000)        
Accounts Receivable, Allowance for Credit Loss, Recovery   1,517,000 1,627,000        
Income Tax Expense (Benefit)   (14,715,000) (21,859,000) (28,941,000)      
Regulatory assets, non-current   541,784,000 593,939,000        
Provision for Expected Credit Losses   $ 7,500,000 5,900,000 3,000,000      
Preferred Resource Portfolio Coal-Fired Generation Retirement MW by 2023   630          
Hardy Hills Solar Project MW   195          
Public Utilities, Property, Plant and Equipment, Net   $ 4,500,000,000 4,000,000,000        
Other Assets, Noncurrent   $ 1,120,591,000 849,054,000        
Gain on acquisition       $ 5,600,000      
Petersburg Unit 1 Retired MW           230  
Petersburg Unit 2 Planned Retirement MW in 2023   415          
Gain on remeasurement of contingent consideration     $ 3,200,000        
Petersburg Energy Center Project MW   250          
Public Utilities, Allowance for Funds Used During Construction, Description   9,315 4,784 5,412      
Allowance for Funds Used During Construction, Capitalized Interest   $ 13,739,000 $ 8,215,000 $ 4,815,000      
Pike Co BESS Project MW   200          
Petersburg Energy Storage Project MW   45          
Petersburg Energy Storage Project MwH   180          
Pike Co BESS Project MwH   800          
Software and Software Development Costs              
Significant Accounting Policies [Line Items]              
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life   8 years          
Deferred Project Costs [Member]              
Significant Accounting Policies [Line Items]              
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life   28 years          
Prepaid Implementation Costs for Software as a Service              
Significant Accounting Policies [Line Items]              
Total other non-current assets   $ 7,100,000 8,200,000        
Other Assets, Noncurrent   $ 7,100,000 8,200,000        
Harding Street [Member]              
Significant Accounting Policies [Line Items]              
Amount of New Operation for Battery Storage Unit, megawatts | MW   20          
Labor Force Concentration Risk [Member]              
Significant Accounting Policies [Line Items]              
Concentration risk percentage   68.00%          
Parent Company [Member]              
Significant Accounting Policies [Line Items]              
Accumulated Other Comprehensive Income (Loss), Net of Tax   $ 29,294,000 22,269,000 (29,407,000)     (43,420,000)
Other Comprehensive Income (Loss), Net of Tax   7,025,000 51,676,000 14,013,000      
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   1,594,000 46,245,000 10,393,000      
Cash and Cash Equivalents, at Carrying Value   537,000 191,000        
Total other non-current assets   1,925,088,000 1,960,939,000        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   537,000 191,000 1,902,000     6,417,000
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax   1,594,000 46,245,000 10,393,000      
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent   5,431,000 5,431,000 3,620,000      
Income Tax Expense (Benefit)   10,928,000 11,027,000 10,364,000      
Other Assets, Noncurrent   1,925,088,000 1,960,939,000        
Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Public Utilities, Inventory   77,198,000 60,497,000        
Receivables from Customers   125,715,000 125,540,000        
Cash and Cash Equivalents, at Carrying Value   25,767,000 199,103,000        
Capitalized Computer Software, Gross   261,872,000 205,910,000        
Emissions Allowance   797,000 797,000        
Service cost   5,189,000 8,949,000 9,339,000      
Interest cost   $ 29,818,000 18,099,000 $ 15,660,000      
Number of customers | customer   523,000          
Electric generation capability for winter, megawatts | MW   3,070          
Electric generation capability for summer, megawatts | MW   2,925          
Total other non-current assets   $ 1,117,051,000 833,536,000        
Unbilled energy revenues   91,463,000 74,488,000        
Loans and Leases Receivable, Related Parties, Description   5,227,000 288,000        
Provision for doubtful accounts   $ 7,413,000 $ 5,851,000        
Capitalized amount, rate   7.10% 5.40% 5.70%      
Depreciation rate   3.70% 3.80% 3.70%      
Depreciation expense   $ 244,800,000 $ 247,500,000 $ 239,100,000      
Utility plant assets   4,500,000,000 4,000,000,000        
Capitalized Computer Software, Accumulated Amortization   (111,110,000) (107,184,000)        
Intangible assets - net   235,656,000 138,978,000        
Capitalized Computer Software, Amortization   14,570,000 10,122,000 11,241,000      
Finite-Lived Intangible Asset, Expected Amortization, Year One   20,764,000          
Finite-Lived Intangible Asset, Expected Amortization, Year Two   20,764,000          
Finite-Lived Intangible Asset, Expected Amortization, Year Three   22,550,000          
Finite-Lived Intangible Asset, Expected Amortization, Year Four   22,550,000          
Finite-Lived Intangible Asset, Expected Amortization, Year Five   22,550,000          
Finite-Lived Intangible Assets, Amortization Expense, Rolling after Year Five   109,178,000          
Restricted Cash and Cash Equivalents   5,000 5,000        
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents   25,772,000 199,108,000 2,761,000     $ 17,951,000
Other Receivables   13,848,000 17,373,000        
Accounts Receivable, Allowance for Credit Loss   (2,283,000) (1,117,000)        
Receivables, Net, Current   233,970,000 216,572,000        
Materials and Supplies, Average Cost   66,392,000 63,111,000        
Inventory, Net   $ 143,590,000 123,608,000        
Allowance for Credit Losses  
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the periods indicated:

For the Years Ended December 31,
20232022
(In Thousands)
Allowance for credit losses:
     Beginning balance$1,117 $647 
     Current period provision7,413 5,851 
     Write-offs charged against allowance
(7,764)(7,008)
     Recoveries collected1,517 1,627 
           Ending Balance$2,283 $1,117 
          
Accounts receivable and unbilled revenue, allowance for doubtful accounts   $ 2,283,000 1,117,000 647,000      
Accounts Receivable, Allowance for Credit Loss, Writeoff   (7,764,000) (7,008,000)        
Accounts Receivable, Allowance for Credit Loss, Recovery   1,517,000 1,627,000        
Income Tax Expense (Benefit)   (25,666,000) (32,887,000) (39,305,000)      
Regulatory assets, non-current   541,784,000 593,939,000        
Provision for Expected Credit Losses   $ 7,500,000 5,900,000 3,000,000      
Preferred Resource Portfolio Coal-Fired Generation Retirement MW by 2023   630          
Hardy Hills Solar Project MW   195          
Public Utilities, Property, Plant and Equipment, Net   $ 4,500,000,000 4,000,000,000        
Project Development Intangible Assets   84,097,000 39,455,000        
Other Assets, Noncurrent   $ 1,117,051,000 833,536,000        
Gain on acquisition       $ 5,600,000      
Gain on remeasurement of contingent consideration     $ 3,200,000        
Petersburg Energy Center Project MW   250          
Public Utilities, Allowance for Funds Used During Construction, Description   9,315 4,784 5,412      
Allowance for Funds Used During Construction, Capitalized Interest   $ 13,739,000 $ 8,215,000 $ 4,815,000      
Pike Co BESS Project MW   200          
Pike Co BESS Project MwH   800          
Indianapolis Power And Light Company | Software and Software Development Costs              
Significant Accounting Policies [Line Items]              
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life   8 years          
Indianapolis Power And Light Company | Deferred Project Costs [Member]              
Significant Accounting Policies [Line Items]              
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life   28 years          
Indianapolis Power And Light Company | Prepaid Implementation Costs for Software as a Service              
Significant Accounting Policies [Line Items]              
Total other non-current assets   $ 7,100,000 8,200,000        
Other Assets, Noncurrent   $ 7,100,000 8,200,000        
Indianapolis Power And Light Company | Harding Street [Member]              
Significant Accounting Policies [Line Items]              
Amount of New Operation for Battery Storage Unit, megawatts | MW   20          
Indianapolis Power And Light Company | Labor Force Concentration Risk [Member]              
Significant Accounting Policies [Line Items]              
Concentration risk percentage   68.00%          
AES U.S. Holdings, LLC [Member]              
Significant Accounting Policies [Line Items]              
Ownership Interest in Parent Company, Percent   85.00%          
CDPQ [Member]              
Significant Accounting Policies [Line Items]              
Ownership Interest in Parent Company, Percent   15.00%          
Physical Unit [Member]              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date Dec. 04, 2024            
Subsequent Event [Member] | Clerical-Technical Unit [Member]              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date Feb. 12, 2026            
Petersburg Unit 1 retirement              
Significant Accounting Policies [Line Items]              
Regulatory assets, non-current   $ 35,700,000          
Petersburg Unit 1 retirement | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Regulatory assets, non-current     287,463,000        
Petersburg Unit 1 retirement and 2 retirement costs              
Significant Accounting Policies [Line Items]              
Regulatory assets, non-current   259,892,000 287,463,000        
Petersburg Unit 1 retirement and 2 retirement costs | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Regulatory assets, non-current   259,892,000          
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]              
Significant Accounting Policies [Line Items]              
Interest and Debt Expense   (7,229,000) (7,229,000) (4,819,000)      
Income Tax Expense (Benefit)   (1,798,000) (1,798,000) (1,199,000)      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 5,431,000 $ 5,431,000 $ 3,620,000