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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 ($)
Dec. 31, 2021
USD ($)
customer
generating_station
item
mi
MW
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
segment
MW
May 31, 2021
Dec. 31, 2018
USD ($)
Significant Accounting Policies [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax       $ (29,407) $ (43,420) $ (19,750)   $ 0
Other Comprehensive Income (Loss), Net of Tax       14,013 (23,670) (19,750)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax       10,393 (27,779) (19,750)    
Public Utilities, Approved Rate Increase (Decrease), Amount     $ 43,900          
Public Utilities, Inventory       41,626 36,953      
Receivables from Customers       100,952 91,335      
Cash and Cash Equivalents, at Carrying Value       6,912 20,502      
Capitalized Computer Software, Gross       162,000 144,500      
Service cost       9,339 8,272 7,412    
Interest cost       $ 15,660 22,151 $ 27,343    
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       516,000        
Distance of Furthest Customer from Indianapolis | mi       40        
Number of generating stations | generating_station       4        
Electric generation capability for winter, megawatts | MW       3,475        
Electric generation capability for summer, megawatts | MW       3,330        
Total other non-current assets       $ 873,923 498,658      
Unbilled energy revenues       64,758 72,334      
Provision for doubtful accounts       $ 2,035 5,861      
Loss contingencies accrued         $ 13,400      
Number of suppliers | item       3        
Capitalized amount, rate       5.70% 6.90% 6.90%    
Depreciation rate       3.70%        
Depreciation expense       $ 239,100 $ 232,800 $ 228,200    
Utility plant assets       4,000,000 4,100,000      
Number of segments | segment           2    
Capitalized Computer Software, Accumulated Amortization       95,800 85,300      
Capitalized Computer Software, Amortization       11,200 10,600 $ 7,500    
Capitalized software, estimated amortization expense in year two       52,500        
Capitalized Software, estimated amortization expense for the next 12 months       10,500        
capitalized software, estimated amortization expense for year two       10,500        
Capitalized software, estimated amortization expense for year three       10,500        
Capitalized software, estimated amortization expense year four       10,500        
Restricted Cash and Cash Equivalents       5 6,120      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       6,917 26,622 48,552   33,599
Accounts Receivable, Related Parties       169 490      
Other Receivables       13,904 4,189      
Accounts Receivable, Allowance for Credit Loss       (647) (3,155)      
Receivables, Net, Current       179,136 165,193      
Materials and Supplies, Average Cost       60,273 58,553      
Inventory, Net       101,899 95,506      
capitalized software, estimated amortization expense year five       10,500        
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax       10,393 (27,779) (19,750)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       3,620 4,109 0    
Accounts receivable and unbilled revenue, allowance for doubtful accounts       647 3,155 921    
Accounts Receivable, Allowance for Credit Loss, Writeoff       $ (6,448) (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 periods indicated (in Thousands):
Year Ended December 31, 2021Beginning Allowance Balance at January 1, 2021Current Period ProvisionWrite-offs Charged Against AllowancesRecoveries CollectedEnding Allowance Balance at
December 31, 2021
Allowance for credit losses$3,155 $2,035 $(6,448)$1,905 $647 
        
Accounts Receivable, Allowance for Credit Loss, Recovery       $ 1,905 1,846      
Income Tax Expense (Benefit)       (28,941) (28,592) (35,528)    
Regulatory assets, non-current       656,977 392,801      
Provision for Expected Credit Losses       $ 3,000 4,800 4,300    
Preferred Resource Portfolio Coal-Fired Generation Retirement MW by 2023       630        
Hardy Hills Solar Project MW       195        
Petersburg Solar Project MW       250        
Petersburg Solar Project MWh energy storage facility       180        
Public Utilities, Property, Plant and Equipment, Net       $ 4,000,000 4,100,000      
Project Development Intangible Assets       39,500        
Other Assets, Noncurrent       873,923 498,658      
Project Development, Estimated Amortization Expense Over the Next 5 Years       4,900        
Project Development Intangible Assets, Estimated Amortization Expense for the Next Twelve Months       0        
Project Development Intangible Assets, Estimated Amortization Expense for Year After Next       1,000        
Project Development Intangible Assets, Estimated Amortization Expense for Three Years in the Future       1,300        
Project Development Intangible Assets, Estimated Amortization Expense for Four Years in the Future       1,300        
Project Development Intangible Assets, Estimated Amortization Expense for Five Year in the Future       1,300        
Gain on acquisition       5,630 0 0    
Loss Contingency Accrual at Carrying Value       $ 200 15,400      
Petersburg Unit 1 Retired MW             230  
Petersburg Unit 2 Planned Retirement MW in 2023       415        
Prepaid Implementation Costs for Software as a Service                
Significant Accounting Policies [Line Items]                
Total other non-current assets       $ 9,100 8,800      
Other Assets, Noncurrent       $ 9,100 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       $ (29,407) (43,420) (19,750)   0
Other Comprehensive Income (Loss), Net of Tax       14,013 (23,670) (19,750)    
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax       10,393 (27,779) (19,750)    
Cash and Cash Equivalents, at Carrying Value       1,902 302      
Total other non-current assets       1,706,408 1,444,222      
Restricted Cash and Cash Equivalents       0 6,115      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       1,902 6,417 3,709   4,409
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax       10,378 (27,779) (19,750)    
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent       3,636 4,109 0    
Income Tax Expense (Benefit)       10,364 11,278 7,909    
Other Assets, Noncurrent       1,706,408 1,444,222      
Indianapolis Power And Light Company                
Significant Accounting Policies [Line Items]                
Public Utilities, Approved Rate Increase (Decrease), Amount     43,900          
Public Utilities, Inventory       41,626 36,953      
Receivables from Customers       100,952 91,335      
Cash and Cash Equivalents, at Carrying Value       2,756 17,946      
Capitalized Computer Software, Gross       162,000 144,500      
Service cost       9,339 8,272 7,412    
Interest cost       $ 15,660 22,151 $ 27,343    
Number of customers | customer       516,000        
Distance of Furthest Customer from Indianapolis | mi       40        
Electric generation capability for winter, megawatts | MW       3,475        
Electric generation capability for summer, megawatts | MW       3,330        
Total other non-current assets       $ 870,212 495,328      
Unbilled energy revenues       64,758 72,334      
Provision for doubtful accounts       2,035 5,861      
Loss contingencies accrued       $ 200 $ 15,400      
Capitalized amount, rate       5.70% 6.90% 6.90%    
Depreciation rate       3.70%        
Depreciation expense       $ 239,100 $ 232,800 $ 228,200    
Utility plant assets       4,000,000 4,100,000      
Capitalized Computer Software, Accumulated Amortization       95,800 85,300      
Capitalized Computer Software, Amortization       11,200 10,600 7,500    
Capitalized software, estimated amortization expense in year two       52,500        
Capitalized Software, estimated amortization expense for the next 12 months       10,500        
capitalized software, estimated amortization expense for year two       10,500        
Capitalized software, estimated amortization expense for year three       10,500        
Restricted Cash and Cash Equivalents       5 5      
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents       2,761 17,951 42,589   $ 27,234
Accounts Receivable, Related Parties       214 734      
Other Receivables       13,904 4,187      
Accounts Receivable, Allowance for Credit Loss       (647) (3,155)      
Receivables, Net, Current       179,181 165,435      
Materials and Supplies, Average Cost       60,273 58,553      
Inventory, Net       101,899 95,506      
capitalized software, estimated amortization expense year five       10,500        
Accounts receivable and unbilled revenue, allowance for doubtful accounts       647 3,155 921    
Accounts Receivable, Allowance for Credit Loss, Writeoff       $ (6,448) (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 periods indicated (in Thousands):
 Year Ended December 31, 2021Beginning Allowance Balance at January 1, 2021Current Period ProvisionWrite-offs Charged Against AllowancesRecoveries CollectedEnding Allowance Balance at
December 31, 2021
Allowance for credit losses$3,155 $2,035 $(6,448)$1,905 $647 
        
Accounts Receivable, Allowance for Credit Loss, Recovery       $ 1,905 1,846      
Income Tax Expense (Benefit)       (39,305) (40,134) (43,430)    
Regulatory assets, non-current       656,977 392,801      
Provision for Expected Credit Losses       $ 3,000 4,800 $ 4,300    
Preferred Resource Portfolio Coal-Fired Generation Retirement MW by 2023       630   630    
Hardy Hills Solar Project MW       195        
Public Utilities, Property, Plant and Equipment, Net       $ 4,000,000 4,100,000      
Project Development Intangible Assets       39,500        
Other Assets, Noncurrent       870,212 495,328      
Project Development, Estimated Amortization Expense Over the Next 5 Years       4,900        
Project Development Intangible Assets, Estimated Amortization Expense for the Next Twelve Months       0        
Project Development Intangible Assets, Estimated Amortization Expense for Year After Next       1,000        
Project Development Intangible Assets, Estimated Amortization Expense for Three Years in the Future       1,300        
Project Development Intangible Assets, Estimated Amortization Expense for Four Years in the Future       1,300        
Project Development Intangible Assets, Estimated Amortization Expense for Five Year in the Future       1,300        
Gain on acquisition       5,630 0 $ 0    
Indianapolis Power And Light Company | Prepaid Implementation Costs for Software as a Service                
Significant Accounting Policies [Line Items]                
Total other non-current assets       9,100 8,800      
Other Assets, Noncurrent       $ 9,100 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       $ 10,500        
Subsequent Event [Member] | 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. 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          
Petersburg Unit 1 retirement                
Significant Accounting Policies [Line Items]                
Regulatory assets, non-current       60,100 74,500      
Petersburg Unit 1 retirement | Indianapolis Power And Light Company                
Significant Accounting Policies [Line Items]                
Regulatory assets, non-current       60,100 74,545      
Petersburg Unit 1 retirement and 2 retirement costs                
Significant Accounting Policies [Line Items]                
Regulatory assets, non-current       300,067 74,545      
Petersburg Unit 1 retirement and 2 retirement costs | Indianapolis Power And Light Company                
Significant Accounting Policies [Line Items]                
Regulatory assets, non-current       300,067        
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       4,819 5,422 $ 0    
Income Tax Expense (Benefit)       (1,199) (1,313) 0    
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest       $ 3,620 $ 4,109 $ 0