Related Party Transactions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Related Party Transaction [Line Items]
Self-insured retention per occurrence	$ 5,000
Insurance expense	11,700	$ 9,500	$ 7,000
Prepaid insurance	7,500	3,400
Health coverage expense	19,000	25,200	23,700
Income taxes receivable	36,500	18,000
Deferred Compensation Arrangement with Individual, Compensation Expense	300	200	200
Billings from related party	7,400	5,700	4,300
Parent Loan Repayment	6,100
Service Company [Member]
Related Party Transaction [Line Items]
Costs incurred by related party	73,800	60,300	58,400
Receivables from Related Party	25,600	2,100
Affiliated Entity
Related Party Transaction [Line Items]
Billings from related party	223,300
Ipalco Enterprises, Inc. [Member]
Related Party Transaction [Line Items]
Costs incurred by related party	11,900	10,000	10,400
Indianapolis Power And Light Company
Related Party Transaction [Line Items]
Self-insured retention per occurrence	5,000
Insurance expense	11,700	9,500	7,000
Prepaid insurance	7,500	3,400
Health coverage expense	19,000	25,200	23,700
Income taxes receivable	5,100	6,700
Deferred Compensation Arrangement with Individual, Compensation Expense	300	200	200
Costs incurred by related party	11,900	10,000	10,400
Billings from related party	7,400	5,700	4,300
Indianapolis Power And Light Company | Service Company [Member]
Related Party Transaction [Line Items]
Costs incurred by related party	$ 73,600	$ 60,100	$ 58,200