Overview and Summary of Significant Accounting Policies (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025 USD ($) generating_station MW	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) generating_station MW	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense (Benefit)	$ 6,635	$ 12,610	$ 42,575	$ 16,519
Accumulated Other Comprehensive Income (Loss), Net of Tax	34,510		34,510		$ 35,378	$ 29,294
Inventories	$ 40,607		$ 40,607		50,842
Number of customers	531,000		531,000
Number of generating stations \| generating_station	4		4
Regulatory assets, current	$ 50,690		$ 50,690		49,093
Inventory, Net	91,297		91,297		99,935
Reclassification from AOCI, Current Period, Net of Tax, Attributable to Parent	(434)	(434)	(868)	326
Capitalized Computer Software, Amortization	6,231	6,788	13,901	13,728
Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain (Loss)	159	(14)	164	(1,537)
Allowance for Funds Used During Construction, Capitalized Interest	6,600	6,411	16,416	11,687
Allowance for Funds Used During Construction, Equity Portion	732	1,269	1,401	2,100
Capitalized Computer Software, Gross	286,261		286,261		280,020
Project development intangible assets	146,661		146,661		83,149
Emissions Allowance	797		797		797
Capitalized Computer Software, Accumulated Amortization	(145,619)		(145,619)		(131,756)
Intangible Assets, Net (Including Goodwill)	288,100		$ 288,100		232,210
Petersburg Energy Center Project MW			250
Petersburg Energy Storage Project MW			45
Petersburg Energy Storage Project MwH			180
Hardy Hills Solar Project MW			195
Hoosier Wind Project MW			106
Pike Co BESS Project MW			200
Pike Co BESS Project MwH			800
Liabilities	5,634,561		$ 5,634,561		5,747,914
Payments to Noncontrolling Interests			(45,223)	0
Investment Tax Credit			133,010	0
Income Taxes Receivable	45,223		45,223		0
Investment Tax Credit			133,010	0
Accrued taxes	$ 25,935		25,935		$ 26,253
Payments to Noncontrolling Interests			(45,223)	0
ITC
Payments to Noncontrolling Interests			45,200
Payments to Noncontrolling Interests			$ 45,200
Aes U.S. Investments [Member]
Ownership percentage by parent (percent)	82.35%		82.35%
CDPQ [Member]
Ownership percentage by parent (percent)	17.65%		17.65%
Ownership interest in parent company (percent)	15.00%		15.00%
AES U.S. Holdings, LLC [Member]
Ownership interest in parent company (percent)	85.00%		85.00%
ITC
Payments to Noncontrolling Interests			$ 87,800
Investment Tax Credit			133,000
Investment Tax Credit			133,000
Payments to Noncontrolling Interests			$ 87,800
Harding Street [Member]
Amount of New Operation for Battery Storage Unit, megawatts \| MW	20		20
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest and Debt Expense	$ 578	578	$ 1,156	(434)
Reclassification out of Accumulated Other Comprehensive Income [Member] \| Accumulated Gain (Loss), Financial Liability, Fair Value Option, Attributable to Parent
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Expense (Benefit)	(144)	(144)	(288)	108
Variable Interest Entity, Primary Beneficiary
Property, Plant and Equipment, Gross	1,391,300	1,169,300	1,391,300	1,169,300
Liabilities	$ 247,800	$ 180,500	$ 247,800	$ 180,500
Subsidiaries [Member]
Electric generation capability for winter, megawatts \| MW	3,070		3,070
Electric generation capability for summer, megawatts \| MW	2,925		2,925

IPALCO ENTERPRISES, INC. 10-Q