Income Taxes (Schedule Of Effective Income Tax Rate) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Entity Information [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State income tax, net of federal tax benefit	8.90%	3.90%	3.90%
Depreciation flow through and amortization		(9.70%)	(12.90%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity		0.50%	(0.30%)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	26.10%	5.20%	9.00%
Other - net	0.00%	0.30%	(0.20%)
Effective tax rate	54.20%	21.20%	20.50%
Effective Income Tax Rate Reconciliation [Line Items]
Other - net	0.00%	0.30%	(0.20%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State income tax, net of federal tax benefit	8.90%	3.90%	3.90%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 16,898
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (839)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	0.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 876
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	26.10%	5.20%	9.00%
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount	$ 49,611
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	(1.80%)
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	$ (3,353)
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	(1300000.00%)
Effective Income Tax Rate Reconciliation, Percent	54.20%	21.20%	20.50%
Income tax expense	$ 103,133	$ 28,364	$ 14,715
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	39,953
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ (13)
Depreciation flow through and amortization		(9.70%)	(12.90%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity		0.50%	(0.30%)
Indianapolis Power And Light Company
Entity Information [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State income tax, net of federal tax benefit	8.00%	3.90%	3.90%
Depreciation flow through and amortization		(7.40%)	(8.00%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity		0.40%	(0.20%)
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	21.40%	4.00%	5.60%
Other - net	0.00%	0.20%	(0.10%)
Effective tax rate	48.90%	22.10%	22.20%
Effective Income Tax Rate Reconciliation [Line Items]
Other - net	0.00%	0.20%	(0.10%)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%	21.00%
State income tax, net of federal tax benefit	8.00%	3.90%	3.90%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount	$ 18,523
Effective Income Tax Rate Reconciliation, Tax Credit, Percent	(0.40%)
Effective Income Tax Rate Reconciliation, Tax Credit, Amount	$ (839)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	0.40%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	$ 876
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	21.40%	4.00%	5.60%
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Amount	$ 49,611
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Percent	(1.50%)
Effective Income Tax Rate Reconciliation, Deduction, Other, Amount	$ (3,353)
Effective Income Tax Rate Reconciliation, Percent	48.90%	22.10%	22.20%
Income tax expense	$ 113,537	$ 38,763	$ 25,666
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 48,732
Depreciation flow through and amortization		(7.40%)	(8.00%)
Effective Income Tax Rate Reconciliation, Funds Used during Construction, Equity		0.40%	(0.20%)

IPALCO ENTERPRISES, INC. 10-K