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Overview and Summary of Significant Accounting Policies (Details)
$ in Thousands
 12 Months Ended
Feb. 13, 2023
Dec. 06, 2021
Oct. 31, 2018
USD ($)
Dec. 31, 2020
USD ($)
generating_station
item
customer
mi
MW
Dec. 31, 2019
USD ($)
segment
MW
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Line Items]              
Accumulated Other Comprehensive Income (Loss), Net of Tax       $ (43,420) $ (19,750) $ 0 $ 0
Other Comprehensive Income (Loss), Net of Tax       (23,670) (19,750) 0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax       (27,779) (19,750) 0  
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 43,900        
Public Utilities, Inventory       36,953 26,907    
Receivables from Customers       91,335 90,747    
Cash and Cash Equivalents, at Carrying Value       20,502 48,152    
Capitalized Computer Software, Gross       144,500 139,600    
Service cost       8,272 7,412 8,450  
Interest cost       $ 22,151 27,343 $ 25,220  
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       512,000      
Distance of Furthest Customer from Indianapolis | mi       40      
Number of generating stations | generating_station       4      
Electric generation capability for winter, megawatts | MW       3,705      
Electric generation capability for summer, megawatts | MW       3,560      
Total other non-current assets       $ 46,716 22,082    
Unbilled energy revenues       72,334 65,822    
Provision for doubtful accounts       5,861      
Loss contingencies accrued       $ 15,400 $ 4,500    
Number of suppliers | item       2      
Capitalized amount, rate       6.90% 6.90% 6.40%  
Depreciation rate       3.70% 3.70% 4.20%  
Depreciation expense       $ 232,800 $ 228,200 $ 235,200  
Utility plant assets       4,100,000      
Number of segments | segment         2    
Capitalized Computer Software, Accumulated Amortization       85,300 $ 74,700    
Capitalized Computer Software, Amortization       10,600 7,500 5,500  
Capitalized software, estimated amortization expense in year two       59,000      
Capitalized Software, estimated amortization expense for the next 12 months       11,800      
capitalized software, estimated amortization expense for year two       11,800      
Capitalized software, estimated amortization expense for year three       11,800      
Capitalized software, estimated amortization expense year four       11,800      
Restricted Cash and Cash Equivalents       6,120 400    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       26,622 48,552 33,599 30,681
Accounts Receivable, Related Parties       490 2,717    
Other Receivables       4,189 2,725    
Accounts Receivable, Allowance for Credit Loss       (3,155) (921)    
Receivables, Net, Current       165,193 161,090    
Materials and Supplies, Average Cost       58,553 56,662    
Inventory, Net       95,506 83,569    
capitalized software, estimated amortization expense year five       11,800      
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax       (27,779) (19,750) 0  
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       4,109 0 0  
Entity Information [Line Items]              
Accounts receivable and unbilled revenue, allowance for doubtful accounts       3,155 921    
Provision for doubtful accounts       5,861      
Accounts Receivable, Allowance for Credit Loss, Writeoff       $ (5,473)      
Allowance for Credit Losses      
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the year ended December 31, 2020 (in Thousands):
 Beginning Allowance Balance at January 1, 2020Current Period ProvisionWrite-offs Charged Against AllowancesRecoveries CollectedEnding Allowance Balance at
December 31, 2020
Allowance for credit losses$921 $5,861 $(5,473)$1,846 $3,155 
      
Accounts Receivable, Allowance for Credit Loss, Recovery       $ 1,846      
Income Tax Expense (Benefit)       (28,592) (35,528) (13,449)  
Regulatory assets       392,801 355,614    
Provision for Expected Credit Losses       4,800 4,300 5,900  
Prepaid Implementation Costs for Software as a Service              
Significant Accounting Policies [Line Items]              
Total other non-current assets       $ 8,800      
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       69.00%      
Parent Company [Member]              
Significant Accounting Policies [Line Items]              
Accumulated Other Comprehensive Income (Loss), Net of Tax       $ (43,420) (19,750) 0 0
Other Comprehensive Income (Loss), Net of Tax       (23,670) (19,750) 0  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax       (27,779) (19,750) 0  
Cash and Cash Equivalents, at Carrying Value       302 3,709    
Total other non-current assets       1,444,222 1,436,748    
Restricted Cash and Cash Equivalents       6,115 0    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       6,417 3,709 4,409 16,383
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax       (27,779) (19,750) 0  
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       4,109 0 0  
Entity Information [Line Items]              
Income Tax Expense (Benefit)       11,278 7,909 8,143  
Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Public Utilities, Approved Rate Increase (Decrease), Amount     43,900        
Public Utilities, Inventory       36,953 26,907    
Receivables from Customers       91,335 90,747    
Cash and Cash Equivalents, at Carrying Value       17,946 42,189    
Capitalized Computer Software, Gross       144,500 139,600    
Service cost       8,272 7,412 8,450  
Interest cost       $ 22,151 27,343 $ 25,220  
Number of customers | customer       512,000      
Distance of Furthest Customer from Indianapolis | mi       40      
Electric generation capability for winter, megawatts | MW       3,705      
Electric generation capability for summer, megawatts | MW       3,560      
Total other non-current assets       $ 43,386 18,045    
Unbilled energy revenues       72,334 65,822    
Provision for doubtful accounts       5,861      
Loss contingencies accrued       $ 15,400 $ 4,500    
Number of suppliers | item       2      
Capitalized amount, rate       6.90% 6.90% 6.40%  
Depreciation rate       3.70% 3.70% 4.20%  
Depreciation expense       $ 232,800 $ 228,200 $ 235,200  
Utility plant assets       4,100,000      
Capitalized Computer Software, Accumulated Amortization       85,300 74,700    
Capitalized Computer Software, Amortization       10,600 7,500 5,500  
Capitalized software, estimated amortization expense in year two       59,000      
Capitalized Software, estimated amortization expense for the next 12 months       11,800      
capitalized software, estimated amortization expense for year two       11,800      
Capitalized software, estimated amortization expense for year three       11,800      
Restricted Cash and Cash Equivalents       5 400    
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       17,951 42,589 27,234 $ 12,342
Accounts Receivable, Related Parties       734 2,992    
Other Receivables       4,187 2,725    
Accounts Receivable, Allowance for Credit Loss       (3,155) (921)    
Receivables, Net, Current       165,435 161,365    
Materials and Supplies, Average Cost       58,553 56,662    
Inventory, Net       95,506 83,569    
capitalized software, estimated amortization expense year five       11,800      
Entity Information [Line Items]              
Accounts receivable and unbilled revenue, allowance for doubtful accounts       3,155 921    
Provision for doubtful accounts       5,861      
Accounts Receivable, Allowance for Credit Loss, Writeoff       $ (5,473)      
Allowance for Credit Losses      
The following table is a rollforward of our allowance for credit losses related to the accounts receivable balances for the year ended December 31, 2020 (in Thousands):
 Beginning Allowance Balance at January 1, 2020Current Period ProvisionWrite-offs Charged Against AllowancesRecoveries CollectedEnding Allowance Balance at
December 31, 2020
Allowance for credit losses$921 $5,861 $(5,473)$1,846 $3,155 
      
Accounts Receivable, Allowance for Credit Loss, Recovery       $ 1,846      
Income Tax Expense (Benefit)       (40,134) (43,430) (21,590)  
Regulatory assets       392,801 355,614    
Probable Petersburg Unit 1 Retirement Reclassification       74,500      
Provision for Expected Credit Losses       4,800 $ 4,300 5,900  
Indianapolis Power And Light Company | Prepaid Implementation Costs for Software as a Service              
Significant Accounting Policies [Line Items]              
Total other non-current assets       $ 8,800      
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       69.00%      
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%      
Subsequent Event [Member] | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Capitalized software, estimated amortization expense year four       $ 11,800      
Subsequent Event [Member] | Physical Unit [Member]              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date   Dec. 06, 2021          
Subsequent Event [Member] | Physical Unit [Member] | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date   Dec. 06, 2021          
Subsequent Event [Member] | Clerical-Technical Unit [Member]              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date Feb. 13, 2023            
Subsequent Event [Member] | Clerical-Technical Unit [Member] | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Collective bargaining agreement expiration date Feb. 13, 2023            
Increase to Annual Depreciation Rate [Member]              
Significant Accounting Policies [Line Items]              
Public Utilities, Approved Rate Increase (Decrease), Amount     28,700        
Increase to Annual Depreciation Rate [Member] | Indianapolis Power And Light Company              
Significant Accounting Policies [Line Items]              
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 28,700        
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]              
Entity Information [Line Items]              
Interest and Debt Expense       (5,422) $ 0 0  
Income Tax Expense (Benefit)       1,313 0 0  
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest       $ (4,109) $ 0 $ 0