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Overview and Summary of Significant Accounting Policies Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2023
Entity Information [Line Items]  
Schedule of Utility Inventory [Table Text Block] The following table summarizes our inventories balances at December 31:
 As of December 31,
 20232022
 (In Thousands)
Inventories
     Fuel$77,198 $60,497 
     Materials and supplies, net66,392 63,111 
          Total inventories$143,590 $123,608 
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
The following table summarizes our accounts receivable balances at December 31:
 As of December 31,
 20232022
 (In Thousands)
Accounts receivable, net
     Customer receivables$125,715 $125,540 
     Unbilled revenue91,463 74,488 
     Amounts due from related parties5,178 239 
     Other13,848 17,373 
     Allowance for credit losses(2,283)(1,117)
           Total accounts receivable, net$233,921 $216,523 
Schedule of Cash and Cash Equivalents [Table Text Block]
The following table provides a summary of cash, cash equivalents, and restricted cash amounts reported within the Consolidated Balance Sheets that reconcile to the total of such amounts as shown on the Consolidated Statements of Cash Flows:

 As of December 31,
 20232022
 (In Thousands)
Cash, cash equivalents and restricted cash
     Cash and cash equivalents$28,579 $201,548 
     Restricted cash (included in Prepayments and other current assets)5 5 
          Total cash, cash equivalents and restricted cash$28,584 $201,553 
Reclassification out of Accumulated Other Comprehensive Income
The amounts reclassified out of AOCI / (AOCL) by component during the years ended December 31, 2023, 2022 and 2021 are as follows (in thousands):

Details about AOCI / (AOCL) componentsAffected line item in the Consolidated Statements of OperationsFor the Years Ended December 31,
202320222021
Net losses on cash flow hedges (Note 5):Interest expense$7,229 $7,229 $4,819 
Income tax effect(1,798)(1,798)(1,199)
Total reclassifications for the period, net of income taxes$5,431 $5,431 $3,620 
Indianapolis Power And Light Company  
Entity Information [Line Items]  
Schedule of Utility Inventory [Table Text Block] The following table summarizes our inventories balances at December 31:
 As of December 31,
 20232022
 (In Thousands)
Inventories
     Fuel$77,198 $60,497 
     Materials and supplies, net66,392 63,111 
          Total inventories$143,590 $123,608 
Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]
The following table summarizes our accounts receivable balances at December 31:
 As of December 31,
 20232022
 (In Thousands)
Accounts receivable, net
     Customer receivables$125,715 $125,540 
     Unbilled revenue91,463 74,488 
     Amounts due from related parties5,227 288 
     Other13,848 17,373 
     Allowance for credit losses(2,283)(1,117)
           Total accounts receivable, net$233,970 $216,572 
Schedule of Cash and Cash Equivalents [Table Text Block]
 As of December 31,
 20232022
 (In Thousands)
Cash, cash equivalents and restricted cash
     Cash and cash equivalents$25,767 $199,103 
     Restricted cash (included in Prepayments and other current assets)5 5 
          Total cash, cash equivalents and restricted cash$25,772 $199,108 
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